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Metin DS, Schmidt F, Beuer F, Prause E, Ashurko I, Sarmadi BS, Unkovskiy A. Accuracy of the intaglio surface of 3D-printed hybrid resin-ceramic crowns, veneers and table-tops: An in vitro study. J Dent 2024; 144:104960. [PMID: 38513937 DOI: 10.1016/j.jdent.2024.104960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Revised: 03/13/2024] [Accepted: 03/19/2024] [Indexed: 03/23/2024] Open
Abstract
OBJECTIVES The present study aims to examine the influence of the build angle on the accuracy (trueness and precision) of 3D printed crowns, table-tops and veneers with a hybrid resin-ceramic material. METHODS One crown, on table-top and one veneer were printed in five different build angles (0°, 30°, 45°, 60°, 90°) (n = 50) with the digital light processing (DLP) system (Varseo XS, Bego) using hybrid resin (Varseo Smile Crownplus A3, Bego). All printed restorations were scanned using the laboratory scanner (D2000, 3Shape) and matched onto the initial reference design in metrology software (Geomagic Control X, 3D Systems). The root mean square error (RMSE) was calculated between the scanned and reference data. The data was statistically analyzed using the Tukey multiple comparison test and Wilcoxon multiple comparison test. RESULTS The crown group showed higher trueness at 30° (0.021 ± 0.002) and 45° (0.020 ± 0.002), and table-tops at 0° (0.015 ± 0.001) and 30° (0.014 ± 0.001) (p < 0.0001). Veneers demonstrated higher trueness at 30° (0.016 ± 0.002) (p < 0.0001). All three restoration types demonstrated the lowest trueness at a 90° build angle and portrayed deviations along the z axis. The veneer and table-top groups showed the lowest precision at 90° (veneers: 0.021 ± 0.008; table-tops: 0.013 ± 0.003). The crown group portrayed the lowest precision at 45° (0.017 ± 0.005) (p < 0.0001). CONCLUSION The build angle of DLP-printed hybrid resin-ceramic restorations influences their accuracy. CLINICAL SIGNIFICANCE Considering the build angle is important to achieve a better accuracy of 3D-printed resin-ceramic hybrid restorations. This may help predict or avoid the interference points between a restoration and a die and minimize the clinical adjustments.
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Affiliation(s)
- Dilan Seda Metin
- Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Dental Materials and Biomaterial Research, Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Aßmannshauser Str., 4-6, 14197, Berlin, Germany
| | - Franziska Schmidt
- Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Dental Materials and Biomaterial Research, Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Aßmannshauser Str., 4-6, 14197, Berlin, Germany
| | - Florian Beuer
- Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Dental Materials and Biomaterial Research, Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Aßmannshauser Str., 4-6, 14197, Berlin, Germany
| | - Elisabeth Prause
- Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Dental Materials and Biomaterial Research, Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Aßmannshauser Str., 4-6, 14197, Berlin, Germany
| | - Igor Ashurko
- Department of Dental Surgery, Sechenov First Moscow State Medical University, Bolshaya Pirogovskaya Street, 19с1, Moscow, 119146, Russia
| | - Bardia Saadat Sarmadi
- Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Dental Materials and Biomaterial Research, Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Aßmannshauser Str., 4-6, 14197, Berlin, Germany
| | - Alexey Unkovskiy
- Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Dental Materials and Biomaterial Research, Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Aßmannshauser Str., 4-6, 14197, Berlin, Germany; Department of Dental Surgery, Sechenov First Moscow State Medical University, Bolshaya Pirogovskaya Street, 19с1, Moscow, 119146, Russia.
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Warmling PG, Zanandrea JSA, Goulart TS, Garcia LFR, de Almeida J. Tetracycline staining of the dentition: a review of the literature and report of a clinical case. Gen Dent 2024; 72:42-48. [PMID: 38640005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/20/2024]
Abstract
The present article reviews the literature regarding tetracycline staining of the dentition and its esthetic management. A total of 49 articles were identified in the initial search, and 22 articles met the eligibility criteria of this narrative literature review. Tetracycline staining results from its use in children between the ages of 6 months and 6 years, when tooth crowns are formed; the effects are dependent on the dosage, duration of treatment, stage of tooth mineralization, and activity of the mineralization process. Tooth bleaching is always the first treatment option for low-grade cases of tetracycline staining. Restorative procedures are indicated for severe staining. The article also describes the treatment of severe staining affecting the maxillary anterior dentition of a 48-year-old man who reported the systemic administration of tetracycline during childhood. Direct composite resin laminate veneers were proposed to achieve immediate, highly esthetic restorations. A combination of different resinous materials in different shades was applied to meet the needs of the patient. The use of direct composite resin laminate veneers satisfied the functional and esthetic demands of the patient at a lower cost than ceramic materials.
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Çakmak G, Donmez MB, Yılmaz D, Yoon HI, Kahveci Ç, Abou-Ayash S, Yilmaz B. Fabrication trueness and marginal quality of additively manufactured resin-based definitive laminate veneers with different restoration thicknesses. J Dent 2024; 144:104941. [PMID: 38490323 DOI: 10.1016/j.jdent.2024.104941] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Revised: 01/11/2024] [Accepted: 03/13/2024] [Indexed: 03/17/2024] Open
Abstract
OBJECTIVES To evaluate how restoration thickness (0.5 mm and 0.7 mm) affects the fabrication trueness of additively manufactured definitive resin-based laminate veneers, and to analyze the effect of restoration thickness and margin location on margin quality. METHODS Two maxillary central incisors were prepared either for a 0.5 mm- or 0.7 mm-thick laminate veneer. After acquiring the partial-arch scans of each preparation, laminate veneers were designed and stored as reference data. By using these reference data, a total of 30 resin-based laminate veneers were additively manufactured (n = 15 per thickness). All veneers were digitized and stored as test data. The reference and test data were superimposed to calculate the root mean square values at overall, external, intaglio, and marginal surfaces. The margin quality at labial, incisal, mesial, and distal surfaces was evaluated. Fabrication trueness at each surface was analyzed with independent t-tests, while 2-way analysis of variance was used to analyze the effect of thickness and margin location on margin quality (α = 0.05). RESULTS Regardless of the evaluated surface, 0.7 mm-thick veneers had lower deviations (P < 0.001). Only the margin location (P < 0.001) affected the margin quality as labial margins had the lowest quality (P < 0.001). CONCLUSION Restoration thickness affected the fabrication trueness of resin-based laminate veneers as 0.7 mm-thick veneers had significantly higher trueness. However, restoration thickness did not affect the margin quality and labial margins had the lowest quality. CLINICAL SIGNIFICANCE Laminate veneers fabricated by using tested urethane-based acrylic resin may require less adjustment when fabricated in 0.7 mm thickness. However, marginal integrity issues may be encountered at the labial surface.
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Affiliation(s)
- Gülce Çakmak
- Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, Bern, Switzerland
| | - Mustafa Borga Donmez
- Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, Bern, Switzerland; Department of Prosthodontics, Faculty of Dentistry, Istinye University, Istanbul, Turkey.
| | - Deniz Yılmaz
- Department of Prosthodontics, Faculty of Dentistry, Alanya Alaaddin Keykubat University, Antalya, Turkey
| | - Hyung-In Yoon
- Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, Bern, Switzerland; Department of Prosthodontics, School of Dentistry and Dental Research Institute, Seoul National University, Seoul, Republic of Korea
| | | | - Samir Abou-Ayash
- Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, Bern, Switzerland
| | - Burak Yilmaz
- Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, Bern, Switzerland; Department of Restorative, Preventive and Pediatric Dentistry, School of Dental Medicine, University of Bern, Bern, Switzerland; Division of Restorative and Prosthetic Dentistry, The Ohio State University College of Dentistry, OH, USA
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Yu F, Xiang F, Zhao J, Lin N, Sun Z, Zheng Y. Clinical outcomes of self-glazed zirconia veneers produced by 3D gel deposition: a retrospective study. BMC Oral Health 2024; 24:457. [PMID: 38622649 PMCID: PMC11020188 DOI: 10.1186/s12903-024-04253-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2024] [Accepted: 04/11/2024] [Indexed: 04/17/2024] Open
Abstract
BACKGROUND Self-glazed zirconia (SZ) restorations are made by a novel additive three-dimensional gel deposition approach, which are suitable for a straightforward completely digital workflow. SZ has recently been used as minimally invasive veneer, but its clinical outcomes have not been clarified yet. This study aimed to evaluate the preliminary clinical outcomes of SZ veneers compared with the widely used lithium disilicate glass-ceramic veneers made by either pressing (PG) or milling (MG) process. METHODS Fifty-six patients treated with SZ, PG, and MG veneers by 2 specialists between June 2018 and October 2022 were identified. Patients were recalled for follow-up at least 1 year after restoration. Clinical outcomes were assessed by 2 independent evaluators according to the modified United States Public Health Service (USPHS) criteria. Overall patient satisfaction was assessed using visual analogue scale (VAS), and analyzed by one-way ANOVA. Chi-square test was applied to compare the difference in the success and survival rates among the 3 groups. RESULTS A total of 51 patients restored with 45 SZ, 40 PG, and 41 MG veneers completed the study, with a patient dropout rate of 8.9%. Mean and standard deviation of follow-up period was 35.0 ± 14.7 months. All restorations performed well at baseline, except for 2 SZ veneers with mismatched color (rated Bravo). During follow-up, marginal discrepancy (rated Bravo) was found in 4 MG veneers and 1 PG veneer, and partially fractured (rated Charlie) was found in another 2 PG veneers. The survival rate of SZ, PG, and MG veneers was 100%, 95%, and 100%, with a success rate of 95.56%, 92.50%, and 90.24%, respectively, none of which were significantly different (p = 0.099 and 0.628, respectively). The mean VAS score of SZ, PG, and MG was 95.00 ± 1.57, 93.93 ± 2.40, and 94.89 ± 2.00 respectively, without significant difference (p > 0.05). CONCLUSION SZ veneers exhibited comparable preliminary clinical outcomes to PG and MG veneers, which could be considered as a feasible option for minimally invasive restorative treatment.
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Affiliation(s)
- Feifei Yu
- School/Hospital of Stomatology, Zhejiang Chinese Medical University, Hangzhou, Zhejiang, China
- 903 Hospital People's Liberation Army, Hangzhou, Zhejiang, China
| | - Fangyue Xiang
- School/Hospital of Stomatology, Zhejiang Chinese Medical University, Hangzhou, Zhejiang, China
| | - Jing Zhao
- School/Hospital of Stomatology, Zhejiang Chinese Medical University, Hangzhou, Zhejiang, China
| | - Nengjie Lin
- School/Hospital of Stomatology, Zhejiang Chinese Medical University, Hangzhou, Zhejiang, China
| | - Zhe Sun
- School/Hospital of Stomatology, Zhejiang Chinese Medical University, Hangzhou, Zhejiang, China
| | - Yuanna Zheng
- School/Hospital of Stomatology, Zhejiang Chinese Medical University, Hangzhou, Zhejiang, China.
- Ningbo Dental Hospital/Ningbo Oral Health Research Institute, Ningbo, Zhejiang, China.
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Durán Ojeda G, Bresser RA, Wendler M, Gresnigt MMM. Ceramic partial laminate veneers in anterior teeth: A literature review. J Prosthodont Res 2024; 68:246-254. [PMID: 37648480 DOI: 10.2186/jpr.jpr_d_23_00090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
Abstract
STUDY SELECTION Partial laminate veneers, defined as small ceramic restorations adhesively luted onto unprepared anterior teeth, are an interesting and conservative alternative to conventional ceramic and composite resin veneers in the anterior region. This literature review aimed to summarize the available laboratory and clinical data on ceramic partial laminate veneers. An electronic search of the MEDLINE/PubMed, EBSCO, and Web of Science databases was conducted. The keywords used were "partial veneer," "partial laminate veneer," "ceramic fragment," and "sectional veneer." The Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines were followed. The risk of bias in the included studies was assessed using the QUIN tool. RESULTS Of the 266 identified articles, only 16 met the inclusion criteria (ten clinical reports, five laboratory studies, and one retrospective clinical study). To date, no randomized controlled clinical trials have been conducted. Most laboratory studies displayed a low risk of bias, with partial laminate veneers rendering adequate strength and color stability. Clinical reports have shown large variability in material selection, luting, and finishing/polishing protocols. CONCLUSIONS Low-quality evidence is available for ceramic partial laminate veneers. Available data from laboratory studies suggest good mechanical and optical performances comparable to those of conventional ceramic and composite resin veneers. Further clinical studies with longer follow-up periods are warranted.
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Affiliation(s)
- Gerardo Durán Ojeda
- University Medical Center Groningen, Department of Restorative Dentistry, Center for Dentistry and Oral Hygiene, University of Groningen, Groningen, The Netherlands
- Facultad de Ciencias de la Salud, Universidad Arturo Prat, Iquique, Chile
| | - Rijkje A Bresser
- University Medical Center Groningen, Department of Restorative Dentistry, Center for Dentistry and Oral Hygiene, University of Groningen, Groningen, The Netherlands
| | - Michael Wendler
- Department of Restorative Dentistry, Faculty of Dentistry, University of Concepción, Concepción, Chile
| | - Marco M M Gresnigt
- University Medical Center Groningen, Department of Restorative Dentistry, Center for Dentistry and Oral Hygiene, University of Groningen, Groningen, The Netherlands
- Facultad de Ciencias de la Salud, Universidad Arturo Prat, Iquique, Chile
- Martini Hospital, Department of Special Dental Care, Groningen, The Netherlands
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Duran Ojeda G, Gresnigt MMM, Romero V, Sanhueza V, Wendler M. Clinical report and fractographic analysis of a fractured partial laminate veneer. J Prosthet Dent 2024; 131:543-547. [PMID: 36372585 DOI: 10.1016/j.prosdent.2022.10.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 10/04/2022] [Accepted: 10/04/2022] [Indexed: 11/12/2022]
Abstract
Ceramic partial laminate veneers represent a conservative option for the correction of morphological abnormalities, diastemas, and fractured anterior teeth, with minimal or no tooth preparation. The present clinical report describes the use of a partial laminate veneer to correct the shape of a maxillary right central incisor to match the restoration of the more damaged adjacent tooth. The failure of the partial laminate veneer after only 18 months was analyzed using a systematic fractographic approach, identifying critical considerations that should be addressed when providing this type of restoration.
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Affiliation(s)
- Gerardo Duran Ojeda
- PhD student, Department of Restorative Dentistry and Biomaterials, University Medical Center Groningen, Center for Dentistry and Oral Hygiene, University of Groningen, Groningen, The Netherlands; Professor, Facultad de Ciencias de la Salud, Universidad Arturo Prat, Iquique, Chile
| | - Marco M M Gresnigt
- Head of the Department, Department of Restorative Dentistry and Biomaterials, University Medical Center Groningen, Center for Dentistry and Oral Hygiene, University of Groningen, Groningen, The Netherlands; Dentist, Department of Special Dental Care, Martini Hospital, Groningen, The Netherlands
| | - Victor Romero
- Owner and Manager, Dental Laboratory DentScire, Santiago, Chile
| | - Vilma Sanhueza
- Associate Professor, Instituto de Geología Económica Aplicada (GEA), Universidad de Concepción, Concepción, Chile
| | - Michael Wendler
- Associate Professor, Department of Restorative Dentistry, Faculty of Dentistry, Universidad de Concepcion, Concepcion, Chile.
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Yousry M, Hammad I, El Halawani M, Aboushelib M. Preparation of ultrathin translucent zirconia laminate veneers using 3D printing reduction guides. J Prosthet Dent 2024; 131:548-553. [PMID: 38480012 DOI: 10.1016/j.prosdent.2024.01.040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Revised: 01/25/2024] [Accepted: 01/26/2024] [Indexed: 04/05/2024]
Abstract
Minimizing and controlling the amount of tooth reduction during the preparation of ultrathin laminate veneers is a challenge for minimally invasive dentistry. The use of reduction guides is advised to reach the optimal space required for the definitive restoration without excessive reduction. The digital production of a reduction guide used to control tooth preparation for ultrathin laminate veneers is described.
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Affiliation(s)
- Mahinour Yousry
- PhD Researcher, Division of Fixed Prosthodontics, Department of Conservative Dentistry, Faculty of Dentistry, Alexandria University, Alexandria, Egypt.
| | - Ihab Hammad
- Professor, Division of Fixed Prosthodontics, Department of Conservative Dentistry, Faculty of Dentistry, Alexandria University, Alexandria, Egypt
| | - Mohamed El Halawani
- Lecturer, Division of Fixed Prosthodontics, Department of Conservative Dentistry, Faculty of Dentistry, Alexandria University, Alexandria, Egypt
| | - Moustafa Aboushelib
- Professor, Department of Dental Materials Science, Faculty of Dentistry, Alexandria University, Alexandria, Egypt
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Schweiger J, Edelhoff D, Schubert O. 3D printing of ultra-thin veneers made of lithium disilicate using the LCM method in a digital workflow: A feasibility study. J ESTHET RESTOR DENT 2024; 36:588-594. [PMID: 37962058 DOI: 10.1111/jerd.13155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Revised: 08/26/2023] [Accepted: 10/07/2023] [Indexed: 11/15/2023]
Abstract
OBJECTIVE This article highlights the feasibility of the additive fabrication of ultra-thin veneers made of lithium disilicate using the lithography-based ceramic manufacturing (LCM) method. CLINICAL CONSIDERATIONS An esthetical appealing restoration of anterior teeth with thin ceramic veneers is considered one of the ultimate challenges in restorative dental prosthetics. These sophisticated restorations can be fabricated in different ways. Both analog and digital subtractive manufacturing processes have been used to date. Either of the methods is highly demanding for the dental technician and dental engineering due to the required low ceramic layer thickness. CONCLUSION Modern additive manufacturing methods, for example LCM technology, enable the production of ultra-thin lithium disilicate veneers with layer thicknesses of down to 0.2 mm and could therefore represent a viable alternative for this indication in the future. CLINICAL SIGNIFICANCE Digital technologies can help streamline workflows, make the outcome more predictable and reproducible, and even further optimize therapeutic restorative options such as highly esthetic veneers for anterior teeth. The reduced material thickness allows for a true non-prep solution or minimally invasive preparation.
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Affiliation(s)
- J Schweiger
- Department of Prosthetic Dentistry, University Hospital, LMU Munich, Munich, Germany
| | - D Edelhoff
- Department of Prosthetic Dentistry, University Hospital, LMU Munich, Munich, Germany
| | - O Schubert
- Department of Prosthetic Dentistry, University Hospital, LMU Munich, Munich, Germany
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Kaur M, Sahu SK. A comparative evaluation of the variations on the shades of pressable ceramic system with the layering technique after different number of firing cycles: An in vitro study. J Indian Prosthodont Soc 2024; 24:144-151. [PMID: 38650339 DOI: 10.4103/jips.jips_421_23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Accepted: 02/20/2024] [Indexed: 04/25/2024] Open
Abstract
AIM The main aim of the present study was to compare and evaluate the effect of repetitive firings on different shades of a pressable all ceramic system layered with veneering porcelain. SETTING AND DESIGN In-vitro comparative study. MATERIALS AND METHODS An in vitro comparative study was conducted, and a total of 60 disc shaped specimens (15 mm in diameter and 0.8 mm in thickness) were made of heat pressed ceramic of shades A2, A3, and B2 (20 discs of each shade) grouped as Group I, II, and III, respectively, using the lost wax technique. The discs were subsequently layered with veneering porcelain followed by glazing and overglazing and underwent a firing cycle at each step until six times combined. CIE L*a*b* measurements were noted on each sample after the third, fourth, fifth, and sixth firing using VITA Easyshade Advance 4.0 spectrophotometer. STATISTICAL ANALYSIS USED Statistical Analysis was done by SPSS 17.0 software. One way analysis of variance, multiple comparisons using the Tukey test, and descriptive statistical analysis were done for all the groups in the study. P <0.05 was statistically significant. RESULTS The mean color differences for the repeated firings were imperceptible (ΔE <1.67) to the human eye for all ceramic samples tested except between the fourth and fifth firing of Group II (shade A3). CONCLUSION The analysis revealed that although repeated firings lead to changes in L*, a*, and b* values, the mean color difference was below the clinically acceptable color change (ΔE <3.7).
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Affiliation(s)
- Manupreet Kaur
- Department of Prosthodontics, Chhattisgarh Dental College and Research Institute, Rajnandgaon, Chhattisgarh, India
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Onuma H, Inokoshi M, Xu K, Minakuchi S. Fracture strength of porcelain veneer on surface-treated zirconia. Dent Mater J 2024; 43:263-268. [PMID: 38382941 DOI: 10.4012/dmj.2023-139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2024]
Abstract
In this study, we investigated the effects of surface treatment on the fracture strength of porcelain-veneered zirconia. Highly translucent 4 mol% yttria-stabilized zirconia disks (KATANA HT, Kuraray Noritake Dental) were divided into three surface-treatment groups: 1)as-sintered, 2) alumina sandblasted, and 3) ground. Crystallographic and surface-roughness analyses were conducted for each group. Veneering ceramics (Cerabien ZR, Kuraray Noritake Dental) were applied to the zirconia surfaces. The fracture strengths of the porcelain-veneered zirconia disks were measured using biaxial flexural-strength tests. Crystallographic analysis revealed that grinding and sandblasting increased the fractions of the monoclinic and rhombohedral zirconia phases. The ground specimens had a higher surface roughness than the sandblasted specimens. Weibull analysis showed no significant differences in biaxial flexural strength among the three groups. The results suggest that these surface treatments do not affect the fracture strength of porcelain-veneered zirconia.
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Affiliation(s)
- Hiraku Onuma
- Department of Gerodontology and Oral Rehabilitation, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU)
- Department of Prosthodontics, Texas A&M University College of Dentistry
| | - Masanao Inokoshi
- Department of Gerodontology and Oral Rehabilitation, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU)
| | - Kaiqi Xu
- Department of Gerodontology and Oral Rehabilitation, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU)
| | - Shunsuke Minakuchi
- Department of Gerodontology and Oral Rehabilitation, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU)
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Irmaleny I, Hidayat OT, Handayani RAP. Componeer as an aesthetic treatment option for anterior teeth: a case report. BMC Oral Health 2024; 24:367. [PMID: 38515046 PMCID: PMC10958890 DOI: 10.1186/s12903-024-04081-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2023] [Accepted: 02/27/2024] [Indexed: 03/23/2024] Open
Abstract
INTRODUCTION Structural abnormalities or anomalies in the anterior teeth, also known as the aesthetic zone, are an important problem for patients and a challenge for dentists. Structural abnormalities or tooth anomalies can change in color, shape, and function. Most dentists prefer minimally invasive aesthetic treatment. One of the aesthetic treatment options for anterior teeth is veneers. Veneer is a restoration that covers the labial part of the tooth with a thin layer of material to correct abnormalities in the color, shape, or function of the tooth. Veneer restoration can be done indirectly with porcelain material made in a laboratory and directly with composite material on the tooth surface or prefabricated which is available from the factory. Componeer is a prefabricated composite veneer that combines the aesthetic properties of ceramic veneers and the adhesive ability of composite veneers to the tooth structure. This case report describes the treatment of two central incisors that had been filled with composite and peg shapes on both lateral incisors using a componeer. CASE REPORT A 32-year-old female patient came to the Dental Conservation Clinic at Dentistry Hospital, Padjadjaran University with the main complaint of her right and left upper front teeth and wanted to repair her old fillings and close the gap between her right and left upper front teeth and her canine teeth. Clinical examination showed that teeth 11 and 21 had been filled with composite which had changed color and had an inharmonious shape as well as a gap between the upper front teeth on the right and left sides and the right and left canine teeth. TREATMENT The maxilla and mandibular teeth are molded for study models and working models. In the working model, a wax-up is carried out, then a mock-up on the patient's teeth. Next, choose the color and size of the components that match the mock up results. Teeth 11 and 21 had their old composite fillings cleaned and refilled with dentin colored composite, teeth 13, 12, 11, 21, 22, and 23 were prepared with a minimum thickness of 0.3 mm to make room for the componeer material. The teeth was etched and bonded, and bonding was applied to the inner surface of the componeer. The composite is placed on the inner surface of the componeer then placed on the labial surface of the tooth and pressed with a special tool, then light cured. The final step is polishing. TREATMENT RESULTS Teeth 13, 12, 11, 21, 22, and 23 which had undergone veneer treatment using componeer, were controlled after 1 week of treatment. The patient did not complain about the results of the treatment and said he was satisfied with the treatment.
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Affiliation(s)
- Irmaleny Irmaleny
- Department of Conservative Dentistry, Faculty of Dentistry, Universitas Padjadjaran, Bandung, Indonesia.
| | - Opik Taofik Hidayat
- Department of Conservative Dentistry, Faculty of Dentistry, Universitas Padjadjaran, Bandung, Indonesia
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12
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Kelleher M. Myths and fallacies about ceramic veneers. Br Dent J 2024; 236:359. [PMID: 38459289 DOI: 10.1038/s41415-024-7193-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2024] [Accepted: 01/25/2024] [Indexed: 03/10/2024]
Affiliation(s)
- M Kelleher
- King´s College London, London, England, SE5 9RW, UK.
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13
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Teng WS, Yew HZ, Jamadon NH, Qamaruz Zaman J, Meor Ahmad MI, Muchtar A. Effect of porcelain veneering technique in bilayered zirconia on bond strength and residual stress distribution. J Mech Behav Biomed Mater 2024; 151:106361. [PMID: 38176199 DOI: 10.1016/j.jmbbm.2023.106361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Revised: 12/26/2023] [Accepted: 12/27/2023] [Indexed: 01/06/2024]
Abstract
The use of all porcelain materials in dentistry has significantly increased in recent years. However, chipping has remained a common problem that affects bilayered zirconia restorations. Bonding between porcelain and the underlying zirconia framework is crucial to the success of the restoration. The bond strength may be affected by such factors as residual thermal stress and the veneering technique. This research focuses on investigating the potential and constraints of materials through an examination of the porcelain veneering technique, particularly hand-layering and heat-pressing. Forty-two cylindrical disc samples of zirconia (n = 7/group) were fabricated in the dimensions of 10 × 1.2 mm (diameter [D] × height [H]). The zirconia specimens were milled from IPS e.max® ZirCad [Z] block and Luxen Zr [L] block (n = 21/zirconia). The zirconia cores were layered with IPS e.max® Zirliner and heat-pressed with IPS e.max® ZirPress to produce a final veneer dimension of 5 × 3 mm (D × H). Conventional layering was performed for the rest of the zirconia cores using IPS e.max® Ceram and Shofu Vintage Zr. The final study groups were Luxen-Vintage (LV), Luxen-Ceram (LC), Luxen Zirpress (LP), ZirCad-Vintage (ZV), ZirCad-Ceram (ZC) and ZirCad-Zirpress (ZP). Five samples were subjected to shear bond testing (SBS) with a universal testing machine with a 5 kN load cell and 0.5 mm/min crosshead speed (n = 5/group). A sample underwent nanoindentation, and another was sectioned using Isomet machine to study the bonding interface. One-way ANOVA was used to run the statistical analyses of the SBS test. Statistical differences were found between ZV with LC and LP (p < 0.05). Residual stress is estimated to be higher in the middle of the porcelain compared with that on the surface and the interface. FESEM imaging reveals portions of visible bare zirconia on Luxen zirconia, whilst crack propagation occurred through voids in all hand-layered groups. Heat-pressed veneering showed comparable but not superior results to conventional hand-layered veneering. Heat-pressed veneering produced similar stress distribution profiles compared with hand-layered veneering.
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Affiliation(s)
- Wen Sheng Teng
- Restorative Department, Faculty of Dentistry, National University of Malaysia, Malaysia
| | - Hsu Zenn Yew
- Restorative Department, Faculty of Dentistry, National University of Malaysia, Malaysia.
| | - Nashrah Hani Jamadon
- Department of Mechanical & Manufacturing Engineering, Faculty of Engineering & Built Environment, National University of Malaysia, Malaysia
| | - Jasmina Qamaruz Zaman
- Restorative Department, Faculty of Dentistry, National University of Malaysia, Malaysia
| | - Meor Iqram Meor Ahmad
- Department of Mechanical & Manufacturing Engineering, Faculty of Engineering & Built Environment, National University of Malaysia, Malaysia
| | - Andanastuti Muchtar
- Department of Mechanical & Manufacturing Engineering, Faculty of Engineering & Built Environment, National University of Malaysia, Malaysia
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An H. Ceramic veneer shade evaluation using a multicolored 3D-printed model-A case report. J ESTHET RESTOR DENT 2024; 36:415-420. [PMID: 37737648 DOI: 10.1111/jerd.13138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Revised: 07/18/2023] [Accepted: 09/10/2023] [Indexed: 09/23/2023]
Abstract
OBJECTIVE This article demonstrates the use of a multicolored 3D-printed model for laboratory shade evaluation of ceramic veneers. CLINICAL CONSIDERATIONS A young female patient presented with peg lateral incisors and diastemata between her maxillary incisors. Four ceramic veneers for her maxillary incisors were fabricated using a digital workflow. A multicolored 3D-printed model was manufactured using material jetting technology. The multicolored model and try-in pastes were used to evaluate and adjust the shade of the veneers. Clinically acceptable color matching was achieved, the veneers were delivered without further chairside shade adjustments. CONCLUSIONS Successful color evaluation and adjustment were achieved using the combination of multicolored 3D-printed model and try-in pastes. The use of this approach saved time for stump shade taking and fabrication of tooth-colored dies. CLINICAL SIGNIFICANCE A multicolored 3D-printed model can be a useful tool for color evaluation and adjustment of ceramic restorations.
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Affiliation(s)
- Hongseok An
- Department of Oral Rehabilitation and Biosciences, Oregon Health & Science University School of Dentistry, Portland, Oregon, USA
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15
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Almohammed SN, Dourado AM, Al Quran FA. Fracture Resistance and Failure Mode of Monolithic Zirconia, Veneered Zirconia, and Metal-Ceramic Full-Coverage Restorations: A Comparative In Vitro Study. INT J PROSTHODONT 2024; 37:80-91. [PMID: 38381987 DOI: 10.11607/ijp.8171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
PURPOSE To evaluate and compare the fracture mode and strength of monolithic zirconia to veneered zirconia and metal-ceramic full-coverage restorations following artificial aging and to test the performance of translucent zirconia in terms of load-bearing capacity. MATERIALS AND METHODS Two mandibular first molars were prepared and scanned for their respective groups of full-coverage restorations. A total of 75 full-coverage restorations were fabricated and divided into five groups: two groups for monolithic zirconia, two groups for veneered zirconia, and one group for metal-ceramic. Then, 75 light-cured hybrid composite resin dies were fabricated to serve as abutments. Before cementation, all full-coverage restorations were subjected to accelerated aging. After cementation, all full-coverage restorations were subjected to compressive loading until fracture in an electromechanical universal testing machine. A two-way nested ANOVA and Tukey test were used to analyze the results with 95% confidence levels. RESULTS Monolithic zirconia full-coverage restorations showed the highest mean fracture resistance of 4,201.0 N, followed by metalceramic full-coverage restorations of 3,609.3 N, and veneered zirconia full-coverage restorations showed the lowest mean fracture resistance of 2,524.6 N. The main mode of failure was cohesive bulk fracture for the monolithic zirconia group, cohesive/adhesive failure with infrastructure damage for the veneered zirconia group, and cohesive/adhesive failure without infrastructure damage for the metal-ceramic group. CONCLUSIONS Monolithic zirconia full-coverage restorations showed superior resistance to fracture compared to metal-ceramic full-coverage restorations and are highly reliable in terms of load-bearing capacity within the posterior regions of the mouth.
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Bennani V, Aarts JM, Senthilkumar A. Effect of a modified laminate veneer preparation design on absolute margin discrepancy and marginal overhang. J Prosthet Dent 2024; 131:252.e1-252.e8. [PMID: 38042643 DOI: 10.1016/j.prosdent.2023.10.033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2023] [Revised: 10/30/2023] [Accepted: 10/31/2023] [Indexed: 12/04/2023]
Abstract
STATEMENT OF PROBLEM Veneer preparation designs impact veneer accuracy. However, whether a modified design could reduce absolute margin discrepancy and marginal overhangs is unclear. PURPOSE The purpose of this in vitro study was to investigate whether a modified veneer preparation design enhances the absolute margin discrepancy and marginal overhang. MATERIAL AND METHODS The absolute margin discrepancy and the marginal overhang of 3 different veneer preparation designs on a typodont tooth (n=20): feather edge, shoulder, and shoulder with wings were measured. The feather edge design was prepared first and subsequently modified to create the shoulder and shoulder with wings preparations. Ceramic veneers were fabricated using computer-aided design and computer-aided manufacture with each veneer assessed for fit before cementation. Ten specimens were cut vertically, and 10 were cut horizontally in each group. The absolute margin discrepancy and marginal overhangs were measured for each cross-section with scanning electron microscopy. Descriptive data analysis and hypothesis testing were conducted using the nonparametric Kruskal Wallis test (α=.05). RESULTS On the vertical sections, the shoulder with wings preparation had the best absolute margin discrepancy and overhang. The design was also best for mesial overhang and mesial absolute margin discrepancy when measuring horizontally. CONCLUSIONS The shoulder with wings preparation design produced the smallest cervical absolute margin discrepancy and overhang. This design also produced absolute margin discrepancy and overhangs comparable with those of the shoulder design in the proximal areas.
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Affiliation(s)
- Vincent Bennani
- Associate Professor, Department of Oral Rehabilitation, Faculty of Dentistry, University of Otago, Dunedin, New Zealand.
| | - John M Aarts
- Senior Lecturer, Department of Oral Rehabilitation, Faculty of Dentistry, University of Otago, Dunedin, New Zealand
| | - Arthi Senthilkumar
- Lecturer, Department of Oral Rehabilitation, Faculty of Dentistry, University of Otago, Dunedin, New Zealand
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Gierthmuehlen PC, Spitznagel FA, Koschate M, Bonfante EA, Prott LS. Influence of ceramic thickness and dental substrate on the survival rate and failure load of non-retentive occlusal veneers after fatigue. J ESTHET RESTOR DENT 2024; 36:373-380. [PMID: 37605963 DOI: 10.1111/jerd.13103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2023] [Revised: 04/26/2023] [Accepted: 06/27/2023] [Indexed: 08/23/2023]
Abstract
OBJECTIVE To investigate the effect of ceramic thickness and dental substrate (enamel vs. dentin/enamel) on the survival rate and failure load of non-retentive occlusal veneers. MATERIALS AND METHODS Human maxillary molars (n = 60) were divided into five test-groups (n = 12). The groups (named DE-1.5, DE-1.0, DE-0.5, E-1.0, E-0.5) differed in their dental substrate (E = enamel, DE = dentin/enamel) and restoration thickness (standard: 1.5 mm, thin: 1.0 mm, ultrathin: 0.5 mm). All teeth were prepared for non-retentive monolithic lithium-disilicate occlusal veneers (IPS e.max Press, Ivoclar). Restorations were adhesively cemented (Syntac Classic/Variolink II, Ivoclar) and exposed to thermomechanical fatigue (1.2 million cycles, 1.6 Hz, 49 N/ 5-55°C). Single load to failure was performed using a universal testing-machine. A linear-regression model was applied, pairwise comparisons used the Student-Newman-Keuls method (p < 0.05). RESULTS Three dentin-based occlusal veneers (one DE-1.0, two DE-0.5) revealed cracks after fatigue exposure, which corresponds to an overall-survival rate of 95%. Load to failure resulted in the following ranking: 2142 N(DE-0.5) > 2105 N(E-1.0) > 2075 N(E-0.5) > 1440 N(DE-1.5) > 1430 N(DE-1.0). Thin (E-1.0) and ultrathin enamel-based occlusal veneers (E-0.5) revealed high failure loads and surpassed the standard thickness dentin-based veneers (DE-1.5) significantly (p = 0.044, p = 0.022). CONCLUSION All tested monolithic lithium disilicate occlusal veneers obtained failure loads above physiological chewing forces. Thin and ultrathin enamel-based occlusal veneers outperformed the standard thick dentin-based occlusal veneers. CLINICAL SIGNIFICANCE Minimally invasive enamel-based occlusal veneer restorations with non-retentive preparation design may serve as a conservative treatment option.
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Affiliation(s)
- Petra C Gierthmuehlen
- Department of Prosthodontics, Medical Faculty and University Hospital Düsseldorf, Heinrich-Heine-University, Düsseldorf, Germany
| | - Frank A Spitznagel
- Department of Prosthodontics, Medical Faculty and University Hospital Düsseldorf, Heinrich-Heine-University, Düsseldorf, Germany
| | | | - Estevam A Bonfante
- Department of Prosthodontics and Periodontology, Bauru School of Dentistry, University of Sao Paulo, Bauru, SP, Brazil
| | - Lea S Prott
- Department of Prosthodontics, Medical Faculty and University Hospital Düsseldorf, Heinrich-Heine-University, Düsseldorf, Germany
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Kalra M, Kurian N, Varghese KG. A technique to remove polymerized excess resin cement from interproximal regions following bonding of porcelain laminate veneers. J Prosthet Dent 2024; 131:352-353. [PMID: 37479624 DOI: 10.1016/j.prosdent.2023.06.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 05/31/2023] [Accepted: 06/02/2023] [Indexed: 07/23/2023]
Affiliation(s)
| | - Nirmal Kurian
- Department of Prosthodontics and Crown & Bridge, Christian Dental College, Ludhiana, Punjab, India
| | - Kevin George Varghese
- Assistant Professor, Department of Prosthodontics and Crown & Bridge, Christian Dental College, Ludhiana, Punjab, India..
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Pitta J, Romandini P, Cantarella J, Kraljevic I, Mojon P, Magne P, Magne M, Sailer I. Extended porcelain veneers in the maxillary anterior region. A retrospective study with an up to 27-year follow-up. Int J Esthet Dent 2024; 19:46-58. [PMID: 38284943] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/30/2024]
Abstract
AIM The aim of the present retrospective study was to evaluate the long-term results, including technical and biologic outcomes, of maxillary extended porcelain veneers with an incisal edge thickness above 2 mm. MATERIALS AND METHODS Patients treated with extended porcelain veneers performed by a single clinician at University of Geneva between 1990 and 2003 were identified and invited to an examination. Of the 37 identified patients, 10 patients with 50 veneers agreed to be examined and were included. A clinical examination was performed to assess survival rates as well as technical and biologic outcomes (modified United States Public Health Services criteria). Patient records were also reviewed to retrieve patient and reconstruction data and every complication event. Patient-reported outcome measures (PROMs) were evaluated using a visual analog scale to measure esthetic satisfaction, functional and phonetic comfort, masticatory improvement, tooth sensitivity, and acceptance of restoration replacement in case of failure. Data were descriptively analyzed, and Kaplan-Meier survival estimators were computed for survival rates and complication events. RESULTS The survival rate of the veneers was 96% after a mean follow-up of 20.7 ± 3.7 years in function. The technical complication rate amounted to 30%, including two failures, nine repairable fractures, three cracks, and one displacement due to trauma. No cavitated caries lesions or endodontic complications were registered. PROMs were very high for esthetic satisfaction and phonetic comfort. CONCLUSIONS Within the limitations of the present retrospective study, extended porcelain veneers appear to be a successful long-term treatment option in terms of clinical outcomes and patient satisfaction.
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Luo T, Li J, Xie C, Yu H. Accuracy of three digital waxing-guided trial restoration protocols for controlling the depths of tooth preparation for ceramic veneers. J Prosthet Dent 2024; 131:56-63. [PMID: 35184885 DOI: 10.1016/j.prosdent.2021.12.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 12/01/2021] [Accepted: 12/01/2021] [Indexed: 11/26/2022]
Abstract
STATEMENT OF PROBLEM The accuracy of digital waxing-guided trial restoration protocols that have been implemented with ceramic veneers has not been reported. PURPOSE The purpose of this in vitro study was to evaluate the accuracy of 3 digital trial restorations fabricated from digital waxing for ceramic veneers. MATERIAL AND METHODS A uniform 0.3-mm digital waxing added to the facial surface of 30 maxillary central typodont incisors was created in a software program. The trial restorations were fabricated on typodont teeth with autopolymerizing acrylic resin by using a silicone index based on 3-dimensionally printed casts designed from the digital waxing. The 30 maxillary central incisors were divided into 3 groups: the depth cutter (0.5 mm, Komet) (DC) group, the round bur (1.5 mm, Diatech) (RB) group, and the specially designed calibrated depth bur (laser mark of 0.5 mm, Gaofeng) (CD) group. The 3 groups were randomly prepared with a random number table by 2 experienced prosthodontists aiming to produce an even facial clearance of 0.5 mm. The dimensional differences in the standard tessellation language (STL) files between the surfaces of the original teeth, digital waxing, trial restorations, and prepared teeth in the software program were measured and analyzed at the same 9 points on the labial surface. One-way ANOVA with a post hoc test was used to identify significant discrepancies between trial restorations and waxing and differences in the reduction depth of typodont teeth (RDT) and the reduction depth (RD) among the 3 techniques (α=.05). The mean relative differences (MRDs) were calculated to determine the accuracy (%). RESULTS The thickness of the trial restorations was significantly greater than that of the digital waxings, with a discrepancy of 0.20 ±0.14 mm, especially at the cervical site. With the use of a trial restoration, the RDTs of the middle (-0.01 ±0.11 mm) and cervical locations (0.09 ±0.20 mm) showed significantly smaller preparation depths than did the other locations. Significant differences in RD were found among the 3 guided techniques (P<.05). Group DC presented the most accurate result of 0.51 ±0.08 mm with an MRD of 2%, whereas the results of 0.57 ±0.10 mm with an MRD of 14% and 0.60 ±0.11 mm with an MRD of 20% were obtained from group RB and group DC, respectively. CONCLUSIONS The trial restoration was significantly thicker than its corresponding waxing. The DC technique presented the most accurate reduction result among the 3 protocols examined.
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Affiliation(s)
- Tian Luo
- PhD candidate, State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, PR China
| | - Junying Li
- Clinical Lecturer, Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, Mich
| | - Chenyang Xie
- Graduate student, State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, PR China
| | - Haiyang Yu
- Professor, State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, PR China.
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Baig MR, Qasim SSB, Baskaradoss JK. Marginal and internal fit of porcelain laminate veneers: A systematic review and meta-analysis. J Prosthet Dent 2024; 131:13-24. [PMID: 35260253 DOI: 10.1016/j.prosdent.2022.01.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Revised: 01/01/2022] [Accepted: 01/04/2022] [Indexed: 11/22/2022]
Abstract
STATEMENT OF PROBLEM Marginal integrity and internal adaptation are key to the long-term success of porcelain laminate veneers. Evidence for their marginal and internal fit is unclear, and the factors affecting such fit have not been identified. PURPOSE The purpose of this systematic review and meta-analysis was to summarize the scientific literature assessing the effects of various parameters on the marginal and internal fit of porcelain laminate veneers. MATERIAL AND METHODS An electronic search was conducted to identify all relevant published articles on the fit accuracy of ceramic veneers between January 2000 and June 2021 in the PubMed-MEDLINE, Scopus, Embase, Google Scholar, and Web of Science databases. Information, including the study outcomes, in terms of the mean marginal gap, internal gap, and absolute marginal discrepancies of porcelain laminate veneers, was extracted from the selected studies. The inverse-variance random effects model was used to analyze the pooled results and estimate the overall effect based on the heterogeneity of studies (α=.05). RESULTS Twenty-one studies were selected for analysis, 2 clinical and 19 in vitro. The risk of bias was "medium" for most studies (19 of 21), and only 2 studies were classified as "high risk." A mean difference of -4.53 μm (95% CI: -21.46 to 12.41) was found, with no statistically significant difference in marginal gap between the pressed and milled fabrication modes (P=.600). As for the internal gap, significant differences were found (mean difference=-40.56 μm; 95% CI: -76.54 to -4.58), with pressed veneers performing better (P=.030). Butt joint preparation design produced significantly (P=.002) lower marginal gaps than the palatal chamfer (mean difference=-14.02 μm; 95% CI: -23.07 to -4.98). CONCLUSIONS No significant differences were found between the pressed and milled porcelain laminate veneers for marginal gap, but for the internal gap, the differences were significantly in favor of the pressed type. The butt joint veneer preparation design was significantly better than the palatal chamfer design in terms of marginal fit.
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Affiliation(s)
- Mirza Rustum Baig
- Associate Professor, Department of Restorative Sciences (Prosthodontics), Faculty of Dentistry, Kuwait University, Kuwait City, Kuwait.
| | - Sayed Saad Bin Qasim
- Assistant Professor, Department of Bioclinical Sciences (Dental Materials), Faculty of Dentistry, Kuwait University, Kuwait City, Kuwait
| | - Jagan Kumar Baskaradoss
- Assistant Professor, Department of Developmental and Preventive Sciences (Dental Public Health), Faculty of Dentistry, Kuwait University, Kuwait City, Kuwait
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Hirata R, Hilgert LA, Sampaio CS, de Andrade OS, Melo G, Ritter AV. Quo vadis, esthetic dentistry? Part II: Composite resin overtreatment and social media appeal. J ESTHET RESTOR DENT 2024; 36:32-36. [PMID: 38142060 DOI: 10.1111/jerd.13162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2023] [Revised: 10/19/2023] [Accepted: 10/20/2023] [Indexed: 12/25/2023]
Abstract
OBJECTIVES This article presents case reports highlighting over-treatments with resin composites, often misconceived as minimally invasive procedures. CLINICAL CONSIDERATIONS Tooth-colored restorative materials, such as ceramics and composites, have found widespread application to correct problems related to tooth color, shape, and alignment. When composite resin is used, these procedures can be done in a very conservative, cost-effective, and timely fashion. However, it is noteworthy that contemporary dental esthetic expectations are based on standards propagated by social media and other marketing and communications platforms. The abuse of and addiction to social media impacts can lead to unrealistic esthetic expectations and standards for both patients and dentists. CONCLUSIONS After a critical discussion on ceramic veneers published in part I of this 2-part series, this article directs attention towards what has become a trendy fashion, i.e., the use of direct composite resins as "non-prep" veneers in clinical situations that arguably required no restorative intervention at all. We further explore how social media influences the decision-making processes of both professionals and patients.
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Affiliation(s)
- Ronaldo Hirata
- Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York City, New York, USA
| | - Leandro Augusto Hilgert
- Department of Operative Dentistry, School of Health Sciences, University of Brasília, Brasilia, Brazil
| | - Camila S Sampaio
- Advanced Clinical Fellowship Programs in Esthetic, and Operative and Digital Dentistry, New York University College of Dentistry, New York City, New York, USA
| | | | - Ginger Melo
- Anatomy and Sculpture and Restorative Dentistry of UNIVAG, Várzea Grande, MT, Brazil
| | - André V Ritter
- University of Washington School of Dentistry, Seattle, Washington, USA
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23
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Nakase D, Kubochi K, Kitani J, Honda J, Iwasaki T, Komine F. Influence of an internal firing of feldspathic porcelain before or after sintering on adaptation of high-translucent zirconia laminate veneers. J Mech Behav Biomed Mater 2023; 148:106208. [PMID: 37922759 DOI: 10.1016/j.jmbbm.2023.106208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Revised: 10/20/2023] [Accepted: 10/23/2023] [Indexed: 11/07/2023]
Abstract
The aim of the present study was to evaluate the influence of two different internal surface treatments, namely, the firing of feldspathic porcelain before or after zirconia sintering, on the marginal and internal adaptation of laminate veneers (LVs) made of high-translucent zirconia. A total of 33 zirconia LVs were fabricated using a CAD/CAM system and divided into three groups based on the internal surface treatment method: the pre-firing (PRE) group involved firing feldspathic porcelain before zirconia sintering, the post-firing (POS) group involved firing feldspathic porcelain after zirconia sintering, and the no treatment (NT) group involved no application of feldspathic porcelain. The adaptation of the LVs was measured using a silicone replica technique. Data were analyzed using the Kruskal-Wallis and Steel-Dwass tests (α = .05). The POS group showed significantly higher marginal discrepancy values than the PRE group across all sites. The internal space values of the PRE groups were significantly lower than those of the NT group at all sites. The internal firing of feldspathic porcelain before zirconia sintering resulted in better marginal adaptation of the high-translucent zirconia LVs than the internal firing of feldspathic porcelain after zirconia sintering. The internal firing of feldspathic porcelain before zirconia sintering can achieve uniform internal adaptation of high-translucent zirconia LVs.
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Affiliation(s)
- Daishi Nakase
- Department of Fixed Prosthodontics, Nihon University School of Dentistry, Japan
| | - Kei Kubochi
- Department of Fixed Prosthodontics, Nihon University School of Dentistry, Japan.
| | - Jin Kitani
- Department of Fixed Prosthodontics, Nihon University School of Dentistry, Japan
| | - Junichi Honda
- Department of Fixed Prosthodontics, Nihon University School of Dentistry, Japan
| | - Taro Iwasaki
- Department of Fixed Prosthodontics, Nihon University School of Dentistry, Japan
| | - Futoshi Komine
- Department of Fixed Prosthodontics, Nihon University School of Dentistry, Japan
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Yıldırım B, Recen D, Paken G. Two-year evaluation of porcelain laminate veneers using FDI criteria. J Prosthodont 2023; 32:854-860. [PMID: 36651602 DOI: 10.1111/jopr.13641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Accepted: 12/22/2022] [Indexed: 01/19/2023] Open
Abstract
PURPOSE The use of porcelain laminate veneers (PLVs) is a minimally invasive technique that is often used in restorative dentistry due to esthetic considerations. The aim of this study was to evaluate PLVs according to the Fédération Dentaire Internationale (FDI) World Dental Federation clinical criteria. MATERIALS AND METHODS This clinical study included 11 patients (7 female and 4 male) who had been admitted to the Uşak University Faculty of Dentistry between February 2019 and February 2021. Before taking part in the study, patients were informed about alternative treatment procedure options. A total of 30 PLVs were fabricated and cemented, and patients were evaluated according to the FDI criteria (with a follow-up after 2 years). RESULTS Restorations were evaluated by two trained researchers. During the follow-up evaluation, no fractures or cracks were observed in any restoration. Further, 73% (n = 22) of the PLVs had perfect marginal adaptation and only 27% (n = 8) had small marginal fractures that could be removed by polishing. Moreover, 57% (n = 17) of the PLVs were evaluated as a good color match (no difference in shade and/or translucency), whereas 33% (n = 13) had only minor deviations. In periodontal examinations, 23% (n = 7) of the PLVs had no plaque, inflammation, or pockets, whereas 77% (n = 23) had minor plaque inflammation and no pocket development. CONCLUSIONS As there were no fractures, fails, or need for removal of the restorations after 2 years, PLVs showed clinically satisfactory performance. The performance of PLVs can be considered highly favorable due to the minimally invasive and periodontally-compatible nature, with a good color match when carefully planned.
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Affiliation(s)
- Bengisu Yıldırım
- Department of Prosthodontics, Faculty of Dentistry, University of Uşak, Usak, Turkey
| | - Duygu Recen
- İzmir Torbalı Oral and Dental Health Center, İzmir, Turkey
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Ayata M, Kilic K, Al-Haj Husain N, Özcan M. Effect of Thickness and Translucency on Color Change and Masking Ability of Ceramic Materials used for Laminate Veneers. Eur J Prosthodont Restor Dent 2023; 31:383-390. [PMID: 37194571 DOI: 10.1922/ejprd_2501ayata08] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 12/10/2022] [Accepted: 04/14/2023] [Indexed: 05/18/2023]
Abstract
This study evaluated the effect of the thickness and translucency of lithium disilicatebased glass ceramics on resin composite substrates on color change and masking effect. Laminate veneers were fabricated using IPS e.max CAD (A1) blocks with two different light transmittance values (High translucent [HT], Low translucent [LT]). Slices of two different thicknesses (0.3 mm, 0.5 mm) were obtained (n=10) and laminate veneers were cemented on the resin composite substrates of two different shades (A2, A3.5). The color change (ΔE values) was evaluated with the CIELab color system using a spectrophotometer, while the masking effect was calculated. The data were analyzed using independent-samples t-test and two-way analysis of variance. The ceramic thickness and translucency had a significant effect on final color and masking. When HT was used, and the laminate veneer thickness decreased (0.3 mm), the masking effect in ΔE values were lower (p⟨0.05). The ΔE values (⟩3.7) were clinically unacceptable. With the increase in thickness, translucency of porcelain laminate veneers decreases showing better color masking ability. Veneer thickness seems to be more effective on the restoration's masking ability than the shade of the substrate and translucency. Cinically, in case a 0.5-mm or thinner laminate veneer is planned, tooth color, resin cement and ceramic type should be considered.
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Affiliation(s)
- M Ayata
- Private Dentos Oral and Dental Health Polyclinic, Kayseri, Turkey
| | - K Kilic
- Erciyes University, Department of Prosthodontics, School of Dentistry, Kayseri, Turkey
| | - N Al-Haj Husain
- Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, Bern, Switzerland
| | - M Özcan
- Division of Dental Biomaterials, Clinic for Reconstructive Dentistry, Center of Dental Medicine, University of Zurich, Switzerland
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Chrispim B, Pottmaier LF, Moreira JM, Bernardon JK, Lopes GC. The challenge of ceramic restorations on dark substrate: a case report. Gen Dent 2023; 71:56-60. [PMID: 37889245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 10/28/2023]
Abstract
The use of dental ceramics on anterior teeth is associated with predictable and long-lasting esthetic results. However, treatment on darkened substrates is challenging. Various conservative options, including ceramic veneers, are available to change the shape and color of anterior teeth. The aim of this case report is to describe the esthetic rehabilitation of a darkened central incisor in a maxillary anterior region that had irregular gingival contours, multiple composite resin restorations, and unsatisfactory tooth shapes. Harmony was restored through periodontal recontouring surgery, placement of a lithium disilicate crown (consisting of a veneer cemented to a coping) on the darkened central incisor, and placement of lithium disilicate veneers on the other maxillary anterior teeth.
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Jurado CA, Villalobos-Tinoco J, Mekled S, Sanchez R, Afrashtehfar KI. Printed Digital Wax-up Model as a Blueprint for Layered Pressed-ceramic Laminate Veneers: Technique Description and Case Report. Oper Dent 2023; 48:618-626. [PMID: 37881104 DOI: 10.2341/22-144-s] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/17/2023] [Indexed: 10/27/2023]
Abstract
This article presents a clinical technique for transferring Digital Smile Design (DSD) information and a digital wax-up to fabricate highly personalized ceramic laminate veneers. The hybrid workflow of digitally designed wax-up and conventional hand-crafted veneers is showcased in a female adult who sought to improve her smile due to maxillary anterior incisal wear. The ceramic veneers, layered by feldspathic porcelain, followed the contours and shade blueprint planned with the digital wax-up. The DSD improved the harmony of the facial-and-smile relationship, and the ceramic restorations fulfilled the patient's esthetic and functional demands. Guides based on the printed model with the digitally designed wax-up can provide a reference for pressed lithium disilicate veneers layered with feldspathic porcelain.
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Affiliation(s)
- C A Jurado
- Carlos Alberto Jurado, DDS, MS, associate professor, Department of Prosthodontics, The University of Iowa College of Dentistry and Dental Clinics, Iowa City, Iowa, USA
| | - J Villalobos-Tinoco
- Jose Villalobos-Tinoco, DDS, MS, visiting faculty, Specialty Program in Periodontics, National University of Rosario School of Dentistry, Rosario, Argentina
| | - S Mekled
- Salwa Mekled, DDS, MBA, associate professor, Department of Restorative Dentistry, Temple University Kornberg School of Dentistry, Philadelphia, PA, USA
| | - R Sanchez
- Ramon Sanchez, MDT, dental technician, private practice, San Felipe, BC, Mexico
| | - K I Afrashtehfar
- *Kelvin I. Afrashtehfar, DDS, MSc, Dr, FDS RCS, FRCDC, assistant professor, Division of Restorative Dental Sciences, Clinical Sciences Department, College of Dentistry, Ajman University, AE, UAE; adjunct research associate professor, Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, BE, Switzerland
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Villalobos-Tinoco J, Jurado CA, Robles M, D'Atri E, Afrashtehfar KI. Tooth-reduction 3D-printed guides for facilitating the provision of ultrathin laminate veneers. A cross-shaped novel design. Int J Esthet Dent 2023; 18:390-404. [PMID: 37819566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 10/13/2023]
Abstract
Tooth-reduction guides offer a more controlled and conservative tooth preparation. Many types of tooth-reduction guides are available such as those with horizontal or vertical reduction grooves. A transparent cross-shaped tooth-reduction guide allows the clinician to make vertical and horizontal depth grooves to evaluate tooth reduction in all directions. The reference grooves on the guide enable the clinician to use a periodontal probe to measure the reduction accurately, and the transparent material provides a clear view of the entire tooth. Controlled tooth reduction offers a more conservative approach that is key for long-term bonded ceramic restorations. The multiaxial rigid transparent tooth-reduction guide could facilitate the provision of ultrathin handcrafted porcelain veneers to predictably fulfill patients' esthetic demands while preserving more tooth structure. The use of technically sound and artistically documented photographic evidence further underscores the effectiveness of this approach, particularly when intra-enamel preparations and adhesive luting under rubber dam isolation are employed. The present article describes a novel 3D-printed guide design that allows the clinician to perform the reduction grooves and evaluate the preparation in the horizontal and vertical directions within the same guide.
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Chen CT, Yang B, Yin YX, Wang XD, Zhao K. Maxillary midline diastema closure with sectional feldspathic porcelain veneers: A case series followed 1 to 4 years. J ESTHET RESTOR DENT 2023; 35:1022-1029. [PMID: 36946620 DOI: 10.1111/jerd.13034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 02/16/2023] [Accepted: 02/17/2023] [Indexed: 03/23/2023]
Abstract
OBJECTIVE To evaluate clinical outcome of maxillary midline diastema closure using sectional feldspathic porcelain veneers up to 4 years. MATERIALS AND METHODS Five female patients with stable maxillary midline diastema were included in the current study and restored with minimal invasive sectional feldspathic porcelain veneers under dental microscope. Esthetic, functional, as well as biologic properties of sectional veneers were evaluated according to the World Dental Federation (FDI) criteria after 1 to 4 years' follow-up. RESULTS Based on FDI criteria, all five cases were evaluated as clinically excellent to satisfactory during a mean observation period of 26.4 months. Slight to moderate cervical marginal staining was observed in two cases after 3 to 4 years' follow-up. Slight white line or ditching of labial surface margin was found in most cases, but it is not easy to be noticed with saliva covering the margins. CONCLUSIONS Sectional feldspathic porcelain veneers presented satisfying clinical outcome with potential long-term esthetic risk for maxillary midline diastema closure. CLINICAL SIGNIFICANCE 1. Sectional feldspathic porcelain veneers presented satisfying short to medium term clinical performance when applied to close maxillary midline diastema. 2. The exposure of labial surface margin may increase a long-term potential esthetic risk.
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Affiliation(s)
- Cui-Ting Chen
- Department of Stomatology, The Third Affiliated Hospital, Sun Yat-Sen University, Guangzhou, China
| | - Bin Yang
- Department of Restorative Dentistry, University of Illinois at Chicago, Chicago, Illinois, USA
| | - Ya-Xiong Yin
- Hospital of Stomatology, Sun Yat-sen University, Guangzhou, China
- Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, China
- Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, China
| | - Xiao-Dong Wang
- Hospital of Stomatology, Sun Yat-sen University, Guangzhou, China
- Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, China
- Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, China
| | - Ke Zhao
- Hospital of Stomatology, Sun Yat-sen University, Guangzhou, China
- Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, China
- Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, China
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Zhu J, Hong F, He L, Wen W, Lei X, Zhang Z, Yin L. The removal of three kinds of occlusal veneers by Er: Yag laser. Hua Xi Kou Qiang Yi Xue Za Zhi 2023; 41:568-572. [PMID: 37805681 PMCID: PMC10580231 DOI: 10.7518/hxkq.2023.2023038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Revised: 06/19/2023] [Indexed: 10/09/2023]
Abstract
OBJECTIVES This study aimed to remove occlusal veneers of varied thicknesses and compositions by Er:Yag laser in vitro and analyze the interfacial microstructure between veneers and tooth that irradiated by laser, by which experimental evidence could be provided to support the non-invasive removal of occlusal veneerby laser. METHODS Fresh mandibular premolars extracted for orthodontic requirements were collected for tooth preparation. Three kinds of ceramic materials (Vita Suprinity, Vita Mark Ⅱ, and Upcera Hyramic) were selected to fabricate occlusal veneer with different thicknesses (1.0, 1.5, and 2.0 mm). One week later, Er:Yag laser (2.5 W and 3.5 W) was used to irradiate and remove the occlusal veneer and recorded the timespan. After the removal operation, the micro-morphologies of samples were examined by scanning electron microscope. RESULTS Upcera Hyramic veneer failed to be removed (>20 min); the operation span at 2.5 W, Vita Suprinity (96.0 s±16.0 s) was longer than Vita MarkⅡ(84.5 s±19.5 s) in the 1.0 mm group (P<0.05), and Vita Suprinity (246.5 s±13.5 s) was longer than Vita MarkⅡ(170.0 s±14.0 s) in the 1.5 mm group (P<0.05). At 3.5 W, Vita Suprinity (381.0 s±24.0 s) was longer than Vita MarkⅡ(341.5 s±26.5 s) in the 2.0 mm group. CONCLUSIONS Increasing laser power could shorten the operation span and facilitate the removal of occlusal veneers with the same thickness and composition. The occlusal veneer was sustained when insufficient laser power was applied. With the same laser power and ceramic thickness, laser penetration could interfere with the integral of the ceramic structure when the laser interacted with the bonding layer. With the same ceramic composition and laser power, the operation span and laser power increased with the thickness of the occlusal veneer. However, the laser was incapable of removing occlusal resin veneer directly.
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Affiliation(s)
- Jianyu Zhu
- Stomatological Hospital of Xiamen Medical College, Xiamen Key Laboratory of Stomatological Disease Diagnosis and Treatment, Xiamen 361000, China
| | - Feifei Hong
- Stomatological Hospital of Xiamen Medical College, Xiamen Key Laboratory of Stomatological Disease Diagnosis and Treatment, Xiamen 361000, China
| | - Lianghang He
- Dept. of Oral Medicine, Xiamen Medical College, Xiamen 361023, China
| | - Wei Wen
- Dept. of Oral Medicine, Xiamen Medical College, Xiamen 361023, China
| | - Xianlin Lei
- Dept. of Oral Medicine, Xiamen Medical College, Xiamen 361023, China
| | - Zhisheng Zhang
- Stomatological Hospital of Xiamen Medical College, Xiamen Key Laboratory of Stomatological Disease Diagnosis and Treatment, Xiamen 361000, China
| | - Lu Yin
- Stomatological Hospital of Xiamen Medical College, Xiamen Key Laboratory of Stomatological Disease Diagnosis and Treatment, Xiamen 361000, China
- Engineering Research Center of Fujian University for Stomatological Biomaterials, Xiamen Medical College, Xiamen 361023, China
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Anastasiadis K, Tzanakakis EG, Magne P. Double bond conversion of preheated composite resin beneath lithium disilicate standardized occlusal veneers. Dent Mater J 2023; 42:739-747. [PMID: 37661372 DOI: 10.4012/dmj.2023-057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/05/2023]
Abstract
The purpose of the study was the investigation of the polymerization of a preheated composite resin beneath lithium disilicate. First, lithium disilicate discs in two shades (HT A2 and HT A4) and three different thicknesses (2, 4, and 6 mm) were bonded on dentine with preheated composite resin that was photo-polymerized for 20 s. The composite resin microhardness, the double bond conversion (DC) and their correlation were estimated. Second, standardized occlusal veneers of two shades and two different thicknesses (4 and 6 mm) were bonded with preheated composite resin and photopolymerized for 60 or 270 s. A microhardness line profiling was performed on the cross-section of each specimen and the correspondence DC was calculated. Shade and thickness of lithium disilicate were found to have a significant impact on micro-hardness and DC of the composite resin. Beneath standardized occlusal veneers DC can reach clinically acceptable level if photopolymerization duration is extended properly.
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Affiliation(s)
| | | | - Pascal Magne
- Center for Education and Research in Biomimetic Restorative Dentistry
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Valente MSO, Neto CF, Obeid AT, Furuse AY, Ishikiriama BLC, Ishikiriama SK, Velo MMAC. Direct vs indirect restorations for diastema closure: determining the suitable approach. Gen Dent 2023; 71:53-57. [PMID: 37595084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 08/20/2023]
Abstract
Determining the appropriate technique for diastema closure is challenging, and the decision must be evidence based. The objective of these case reports is to describe different approaches to diastema closure using direct and indirect techniques, focusing on the characteristics of the patient and clinical requirements to guide treatment. In the first case, a 16-year-old patient had multiple diastemas in the maxillary anterior dentition. The clinical evaluation revealed microdontia of the lateral incisors and malpositioned teeth. The treatment included tooth whitening and placement of composite resin veneers using a direct technique. In the second case, a 54-year-old patient displayed a disharmonious and esthetically compromised smile due to small teeth, color changes, multiple diastemas, incisal wear, and severe dentogingival disproportion. Based on the patient's expectations, the patient's age, and the presence of a "black triangle" interdental space, a multidisciplinary restorative treatment was proposed, including gingivoplasty, tooth whitening, and placement of ceramic laminate veneers using an indirect technique. Both approaches achieved successful esthetic rehabilitation and diastema closure with minimal intervention. The choice of procedure and restorative material, as well as the need for tooth preparation, varied based on the clinical requirements, patient expectations, and financial constraints. Careful treatment planning avoided lengthy and inefficient procedures.
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Mayinger F, Meinen J, Coldea A, Zimmermann M, Stawarczyk B. Digital versus conventional veneering of zirconia and cobalt chromium crowns: Fracture load before and after thermomechanical aging. J Prosthet Dent 2023; 130:251.e1-251.e8. [PMID: 37244796 DOI: 10.1016/j.prosdent.2023.04.023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Revised: 04/28/2023] [Accepted: 04/28/2023] [Indexed: 05/29/2023]
Abstract
STATEMENT OF PROBLEM To complement the digital workflow for manufacturing fixed dental prostheses, both high-strength frameworks and esthetic veneers should be designed and fabricated digitally. However, how the fracture load of digitally veneered restorations compares with conventionally fabricated restorations is unclear. PURPOSE The purpose of this in vitro study was to examine the fracture load of digitally and conventionally veneered zirconia and cobalt chromium crowns initially and after thermomechanical aging. MATERIAL AND METHODS Milled zirconia and cobalt chromium copings for a maxillary canine were fabricated (N=96). Digital veneers were milled and connected to the copings with a sintered ceramic slurry. The conventional veneers were fabricated by using a master mold, and the crowns were bonded to the cobalt chromium abutments. Half the specimens were subjected to 6000 thermal (5 °C to 55 °C, 60 seconds) and 1 200 000 mechanical (50 N, 1.5 Hz, 0.7 mm lateral movement) cycles opposed by steatite antagonists, and the fracture load was determined. Fracture types were categorized, and scanning electron microscopy performed. The data were analyzed with a 3-way global univariate analysis of variance, t test, the Pearson chi-squared test, and the Weibull modulus (α=.05). RESULTS Unlike the framework material (P=.316) and artificial aging (P=.064), the veneering protocol affected the fracture load (P=.007). Digital veneers (range: 2242 to 2929 N) led to lower values than conventional veneers (range: 2825 to 3166 N), which was significant for aged cobalt chromium copings (P=.024; 2242 versus 3107 N). Conventionally veneered crowns showed lower Weibull moduli after thermomechanical aging (range: 3.2 to 3.5) than initially (range: 7.8 to 11.4). The copings of all the zirconia specimens fractured, while chipping occurred with the cobalt chromium specimens. CONCLUSIONS The high fracture load values of the veneered crowns, even after simulated 5-year aging, indicated sufficient mechanical properties (nearly 4-fold the average occlusal force of 600 N) for the successful clinical application of digitally veneered zirconia and cobalt chromium copings.
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Affiliation(s)
- Felicitas Mayinger
- Research Associate, Department of Prosthetic Dentistry, Dental School, Ludwig Maximilian University of Munich, Munich, Germany.
| | - John Meinen
- Dental Technician, Department of Prosthetic Dentistry, Dental School, Ludwig Maximilian University of Munich, Munich, Germany
| | - Andrea Coldea
- Research Associate, Department of Prosthetic Dentistry, Dental School, Ludwig Maximilian University of Munich, Munich, Germany
| | - Marcus Zimmermann
- Dental Technician, Division of Computerized Restorative Dentistry, Clinic of Conservative and Preventive Dentistry, Center of Dental Medicine, University of Zürich, Zürich, Switzerland
| | - Bogna Stawarczyk
- Professor, Department of Prosthetic Dentistry, Dental School, Ludwig Maximilian University of Munich, Munich, Germany
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Villalobos-Tinoco J, Jurado CA, Afrashtehfar KI, Fischer N. Combination of minimal- and non-preparation techniques with ceramic veneers for managing esthetic deficiencies. Int J Esthet Dent 2023; 18:232-243. [PMID: 37462377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 07/21/2023]
Abstract
Non-preparation (non-prep) ceramic veneers are a convenient and conservative treatment option, but controversy exists about their predictability. Concerns remain about possible overcontouring, poor-quality margins, and early esthetic failure. The present clinical report describes the combination of minimally invasive and non-prep ceramic laminate veneers in the esthetic zone with a 6-year follow-up to replace stained composite resin veneers on both maxillary central incisors. Composite resin veneers on the maxillary central incisors were replaced with ceramic veneers, and a non-prep ceramic veneer was placed on the maxillary right lateral incisor. A diagnostic additive wax-up was done, followed by a mock-up guide to conservatively prepare both maxillary central incisors. The three feldspathic porcelain veneer restorations were cemented under rubber dam isolation. The 6-year follow-up showed that stained composite resin veneers can successfully be replaced with minimally invasive and non-prep ceramic veneers to meet the patient's esthetic wishes. Overall, well-planned and well-executed restorative procedures combining minimal preparation and non-prep for ceramic laminate veneers can achieve esthetically pleasing outcomes and maximize tooth structure preservation in the maxillary anterior region.
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Unterschütz L, Fuchs F, Mayer LA, Koenig A, Challakh N, Schulz-Kornas E, Ziebolz D, Hahnel S. Influence of dental prophylaxis procedures on the tooth veneer interface in resin-based composite and polymer-infiltrated ceramic veneer restorations: an in vitro study. Clin Oral Investig 2023; 27:2595-2607. [PMID: 36502509 PMCID: PMC10264478 DOI: 10.1007/s00784-022-04816-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Accepted: 11/30/2022] [Indexed: 12/14/2022]
Abstract
OBJECTIVES The aim of this study was to investigate the influence of dental prophylaxis cleaning procedures and artificial aging on veneers in human teeth. The external marginal and internal tooth veneer as well as the restoration surfaces were examined. MATERIAL AND METHODS Thirty-two extracted premolars were restored with resin-based composite (RBC) and polymer-infiltrated ceramic network (PICN) veneers. Artificial aging by alternating thermocycling and subsequent prophylaxis procedure (glycine-based powder air polishing or ultrasonic scaling) was conducted for five consecutive cycles. The external marginal interface was examined by height profile measurements and the internal interface was investigated using micro X-ray computed tomography. In addition, the surface texture of the veneer surface was analyzed using confocal laser scanning microscopy. RESULTS The application of both prophylaxis procedures resulted in a deepening of the marginal interface (10 µm ± 8 µm) for materials. Furthermore, the internal interface of PICN restorations showed marginal gaps after both treatments and artificial aging (16 µm ± 3 µm). In contrast to the RBC specimens, a significant increase in surface roughness was identified for PICN veneers after ultrasonic scaling. CONCLUSIONS The marginal and internal interface regions in veneers fabricated from PICN and RBC were affected by prophylaxis procedures. Furthermore, it may result in increased veneer surface roughness, especially in PICN and after ultrasonic scaling, which might affect bioadhesion and longevity. CLINICAL RELEVANCE After dental prophylaxis procedures, examination of the marginal and the internal interface as well as the veneer surface provides a precise insight into damage mechanisms and offers an assessment of longevity.
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Affiliation(s)
- Lena Unterschütz
- Department of Prosthetic Dentistry and Dental Material Science, Leipzig University, Liebigstraße 12, 04103, Leipzig, Germany
| | - Florian Fuchs
- Department of Prosthetic Dentistry and Dental Material Science, Leipzig University, Liebigstraße 12, 04103, Leipzig, Germany.
| | - Laura-Antonia Mayer
- Department of Prosthetic Dentistry and Dental Material Science, Leipzig University, Liebigstraße 12, 04103, Leipzig, Germany
| | - Andreas Koenig
- Department of Prosthetic Dentistry and Dental Material Science, Leipzig University, Liebigstraße 12, 04103, Leipzig, Germany
| | - Nadia Challakh
- Department of Cariology, Endodontology and Periodontology, Leipzig University, Liebigstraße 12, 04103, Leipzig, Germany
| | - Ellen Schulz-Kornas
- Department of Cariology, Endodontology and Periodontology, Leipzig University, Liebigstraße 12, 04103, Leipzig, Germany
| | - Dirk Ziebolz
- Department of Cariology, Endodontology and Periodontology, Leipzig University, Liebigstraße 12, 04103, Leipzig, Germany
| | - Sebastian Hahnel
- Department of Prosthetic Dentistry, UKR University Hospital Regensburg, Franz-Josef-Strauß-Allee 11, 93053, Regensburg, Germany
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Deng XL, Yuan S, Zhu DT, Shi L. [Evaluation of red and white aesthetic effects of porcelain veneers in the restoration of developmental anterior dental gaps]. Shanghai Kou Qiang Yi Xue 2023; 32:276-279. [PMID: 37803983] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 10/08/2023]
Abstract
PURPOSE To evaluate the red and white aesthetic effect of porcelain veneer in the restoration of developmental anterior interdental spaces. METHODS A total of 152 anterior teeth in 64 patients with developmental anterior dental gaps were restored using porcelain veneers, the aesthetic effects before and after restoration were evaluated by pink aesthetic index (PES) and white aesthetic index(WES), the aesthetic effect of gingival papilla filling and reconstruction was evaluated by interdental gingival papilla index (PIS), and visual analogue score (VAS) was used to compare the satisfaction of patients before and after restoration. SPSS 203.0 software package was used for statistical analysis. RESULTS The overall mean scores of PES before and after restoration of 152 developmental anterior interdental teeth were 9.63±2.23 and 13.64±0.88, respectively. The average scores of WES before and after restoration were 6.85±1.87 and 9.81±0.58, respectively. There were significant differences of PES and WES scores before and after restoration(P<0.01). According to the requirements of "near" perfect restoration(PES≥13 points, WES≥9 points), the red and white aesthetic effect after restoration was near the standard. The scores of PIS before and after restoration were 1.86±0.67 and 2.97±0.18, the interdental gingival papilla was completely filled with space, and the shape was ideal, there were significant statistical differences before and after restoration(P<0.01). Patients were more satisfied with the smile curve and morphology of the restored anterior teeth than other parameters. CONCLUSIONS The aesthetic effect of using porcelain veneers to repair developmental anterior interdental gaps is ideal, among which the filling of the papillae between the teeth can meet the expectations of patients, and the aesthetic effect evaluation of PIS and PES/WES applied to porcelain veneers to repair developmental anterior interdental spaces has practical guiding significance in clinical practice.
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Affiliation(s)
- Xiao-Lin Deng
- Jing'an Dental Clinic. Shanghai 200070, China. E-mail:
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Gouda A, Sherif A, Wahba M, Morsi T. Effect of veneering material type and thickness ratio on flexural strength of bi-layered PEEK restorations before and after thermal cycling. Clin Oral Investig 2023; 27:2629-2639. [PMID: 36602589 PMCID: PMC10264476 DOI: 10.1007/s00784-022-04829-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Accepted: 12/18/2022] [Indexed: 01/06/2023]
Abstract
OBJECTIVE The purpose of this study was evaluating the biaxial strength of bi-layered PEEK restorations before and after aging using different veneering materials in different thickness ratios. MATERIAL AND METHODS Ninety specimens of thickness 1.5 mm were divided into three groups according to their veneering material. Group (CAD LD): BioHPP discs veneered with CAD milled lithium disilicate (n=30), group (CAD C): BioHPP discs veneered with CAD milled composite (n=30), and group (LC): BioHPP discs veneered with conventionally layered composite (n=30). Each group was subdivided into 3 subgroups (n=10) according to the different thickness ratios between the core and the veneering material (TC:TV). Subgroup 1: TC:TV=1:0.5, subgroup 2: TC:TV=0.7:0.8, and subgroup 3: TC:TV=0.5:1. Half of the specimens of each subgroup were subjected to thermocycling, and the bi-axial flexural strength of all specimens was tested before and after aging. Three-way ANOVA followed by Bonferroni's post hoc test were used for data analysis. The significance level was set at P ≤ 0.05. RESULTS Material, thickness ratio, and aging all had a significant effect on biaxial flexural strength. (LC) group had the highest biaxial flexural strength. TC:TV=0.5:1 showed the lowest biaxial flexural strength. All groups showed significant decrease in biaxial flexural strength after aging. CONCLUSIONS Veneering material for PEEK together with the thickness ratio between the core and veneering material greatly affect the flexural strength of bi-layered restorations. Thermocycling negatively impacts the flexural strength of PEEK bi-layered restorations. CLINICAL SIGNIFICANCE According to the results of that study, PEEK cores are best veneered with conventionally layered composite with core to veneering thickness ratio being 1:0.5.
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Affiliation(s)
- Ahmed Gouda
- Postgraduate Student, Faculty of Oral and Dental Medicine, Future University in Egypt, Cairo, Egypt
| | - Ashraf Sherif
- Fixed Prosthodontics Department, Faculty of Oral and Dental Medicine, Future University in Egypt, Cairo, Egypt
| | - Mennatallah Wahba
- Fixed Prosthodontics Department, Faculty of Oral and Dental Medicine, Future University in Egypt, Cairo, Egypt
| | - Tarek Morsi
- Fixed Prosthodontics Department, Faculty of Dentistry, Ain Shams University, Cairo, Egypt
- Vice Dean Postgraduate Affairs. Faculty of Oral and Dental Medicine, Misr International University, Cairo, Egypt
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Arshad M, Vaziri N, Habibzadeh S. Effect of Internal, Office, and Home Bleaching on Shear Bond Strength of Enamel to Porcelain Laminate Veneers. INT J PROSTHODONT 2023; 36:323-330. [PMID: 36484656 DOI: 10.11607/ijp.7773] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/01/2024]
Abstract
PURPOSE To compare the effect of office, home, and internal bleaching on the shear bond strength (SBS) of enamel to porcelain laminate veneers. MATERIALS AND METHODS A total of 36 extracted maxillary central incisors were randomly assigned to four groups: (1) no bleaching (control); (2) office bleaching with 40% hydrogen peroxide (HP); (3) home bleaching with 15% carbamide peroxide; and (4) intracoronal bleaching with sodium perborate (SP) using the walking bleaching technique. All teeth were separately immersed in artificial saliva for 14 days. The enamel surface was then reduced by 0.5 mm, and IPS e.max Press ceramic discs were bonded using a resin cement. After 24 hours, all specimens were thermocycled (5,000 cycles, 5°C to 55°C). The SBS was measured using a universal testing machine, and the failure mode was determined using a stereomicroscope. One-way ANOVA and Tukey honest significant difference tests were used for data analysis (P < .05). RESULTS A significant difference was noted among the groups (P < .001). The highest SBS was noted in the control group (15.71 ± 5.39 MPa). The mean SBS in the office bleaching group (12.30 ± 4.64 MPa) was almost the same as the control. The lowest mean SBS belonged to the home bleaching group (5.39 ± 3.99 MPa). The mode of failure was adhesive in all four groups. CONCLUSION If bleaching is intended to be followed by porcelain veneers, the office bleaching technique with 40% HP is recommended. Delaying the bonding procedure for 2 weeks does not appear to be effective with home or intracoronal bleaching.
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Utar M, Demirtağ Z. Four-point flexural strength and microtensile bond strength of digitally and conventionally veneered zirconia. Eur J Oral Sci 2023; 131:e12926. [PMID: 36792368 DOI: 10.1111/eos.12926] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2022] [Accepted: 01/27/2023] [Indexed: 02/17/2023]
Abstract
This study intended to evaluate the effect of digital veneering on four-point flexural strength (FS) and microtensile bond strength (μTBS) of veneered zirconia. Two different zirconia blocks, a lithium disilicate and a feldspathic ceramic block, and two different layering ceramics were used. IPS e.max Zir CAD (ZC) and Vita In-Ceram YZ (YZ) with yttria stabilized tetragonal zirconia polycrystals (3Y-TZP) were used as substructures. IPS e.max CAD (LD), Vita Mark II (VMII), IPS e.max Ceram (EC) and Vita VM9 (VM9) were used for veneering. Resin cement and fusion ceramic were placed between veneer and zirconia substructure for digital veneering. A total of one hundred and fifty specimens in five groups (n = 30) were prepared for FS and tested in universal machine at 1.0 mm/min. One hundred specimens in five groups (n = 20) were obtained for the μTBS and tested at 1.0 mm/min. Statistical analysis was made by one way ANOVA and Tukey HSD. Conventional veneering showed statistically significant FS. ZC veneered with EC had the highest mean FS and the lowest was obtained in groups veneered through resin cement. YZ layered with VM9 had the highest mean μTBS. ZC veneered through fusion ceramic and YZ veneered through resin cement showed significantly lower and similar μTBS.
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Affiliation(s)
- M Utar
- Kırıkkale University, Kırıkkale, Turkey
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Mueller B, Pilecco RO, Valandro LF, Ruschel VC, Pereira GKR, Bernardon JK. Effect of immediate dentin sealing on load-bearing capacity under accelerated fatigue of thin occlusal veneers made of CAD-CAM glass-ceramic and resin composite material. Dent Mater 2023; 39:372-382. [PMID: 36922258 DOI: 10.1016/j.dental.2023.03.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2022] [Revised: 02/05/2023] [Accepted: 03/03/2023] [Indexed: 03/16/2023]
Abstract
OBJECTIVE The objective of this study was to assess the influence of immediate dentin sealing (IDS) on the fatigue behavior of laminate occlusal veneers fabricated with CAD/CAM lithium disilicate ceramic and resin composite. METHODS Forty sound human molars were prepared and randomly divided into 4 groups (n = 10): RC-IDS+ (IDS and resin composite occlusal laminate veneer); RC-IDS- (resin composite occlusal laminate veneer without IDS); LD-IDS+ (IDS and lithium disilicate laminate veneer); LD-IDS- (lithium disilicate occlusal laminate veneer without IDS). The restorations were obtained using a digital workflow. After surface conditioning and bonding, thermocycling and accelerated fatigue tests (20 Hz, 5000 cycles with an initial load of 300 N, step-size of 100 N for 10,000 cycles, up to 1000 N, and then a step-size of 50 N until failure) were conducted. Fatigue data were recorded for both outcomes (crack or fracture) and statistically analyzed. Fractographic and adhesive interface analysis were conducted. RESULTS The indirect resin composite groups showed better fatigue behavior compared to lithium disilicate. IDS only had a positive effect for the survival of resin composite restorations for the 'fracture' outcome. Evident presence of micro-gaps at the adhesive interface in the LD-IDS- group could be noted. SIGNIFICANCE Immediate dentin sealing improved fatigue resistance behavior of resin composite occlusal veneers. However, this effect was not observed in lithium disilicate veneers.
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Affiliation(s)
- Bruna Mueller
- MSciD and PhD Post-Graduate Program in Oral Science, Ontological Clinic, Faculty of Dentistry, Federal University of Santa Catarina (UFSC), Florianópolis, Santa Catarina State, Brazil
| | - Rafaela Oliveira Pilecco
- MSciD and PhD Post-Graduate Program in Oral Science, Prosthetic Dentistry Unit, Faculty of Dentistry, Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul State, Brazil
| | - Luiz Felipe Valandro
- MSciD and PhD Post-Graduate Program in Oral Science, Prosthetic Dentistry Unit, Faculty of Dentistry, Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul State, Brazil
| | - Vanessa Carla Ruschel
- MSciD and PhD Post-Graduate Program in Oral Science, Ontological Clinic, Faculty of Dentistry, Federal University of Santa Catarina (UFSC), Florianópolis, Santa Catarina State, Brazil
| | - Gabriel Kalil Rocha Pereira
- MSciD and PhD Post-Graduate Program in Oral Science, Prosthetic Dentistry Unit, Faculty of Dentistry, Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul State, Brazil.
| | - Jussara Karina Bernardon
- MSciD and PhD Post-Graduate Program in Oral Science, Ontological Clinic, Faculty of Dentistry, Federal University of Santa Catarina (UFSC), Florianópolis, Santa Catarina State, Brazil
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Worpenberg C, Stiesch M, Eisenburger M, Breidenstein B, Busemann S, Greuling A. The effect of surface treatments on the adhesive bond in all-ceramic dental crowns using four-point bending and dynamic loading tests. J Mech Behav Biomed Mater 2023; 139:105686. [PMID: 36706651 DOI: 10.1016/j.jmbbm.2023.105686] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Revised: 01/10/2023] [Accepted: 01/23/2023] [Indexed: 01/26/2023]
Abstract
The aim of this study was to determine the effect of sandblasting, grinding and plasma treatment on the adhesive bond strength between framework ceramic (Y-TZP) and veneering ceramic (feldspar ceramic). Therefore, four-point bending specimens (n = 180) were cut from densely sintered 3Y-TZP blanks. Subsequently, 80 of these samples received surface treatment by sandblasting and 80 samples by grinding. A reference group (20 samples) was not processed. Half of the specimens that received a surface treatment were additionally exposed to an oxygen plasma treatment. After processing, all specimens were manually veneered with feldspar ceramic and examined with a four-point bending test to evaluate the strain energy release rate G. The surface treatment parameters that achieved the highest and lowest G were transferred to real geometries of a posterior crown (n = 45). The crowns' ceramic framework was sandblasted and veneered by hand. The all-ceramic crowns were tested in a dynamic loading test and Wöhler curves were evaluated. Four-point bending samples blasted at an angle of 90° at 6 bar and a working distance of 1.5 cm without plasma treatment achieved the highest energy release rate. Samples blasted at an angle of 90° at 2 bar and a working distance of 1 cm with plasma treatment achieved the lowest energy release rate. Overall, plasma treatment did not improve bond strength. In the dynamic loading test, the group blasted with 2 bar showed the best results.
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Affiliation(s)
- Christin Worpenberg
- Department of Prosthetic Dentistry and Biomedical Materials Science, Hannover Medical School, Carl-Neuberg-Straße 1, 30625, Hannover, Germany
| | - Meike Stiesch
- Department of Prosthetic Dentistry and Biomedical Materials Science, Hannover Medical School, Carl-Neuberg-Straße 1, 30625, Hannover, Germany
| | - Michael Eisenburger
- Department of Prosthetic Dentistry and Biomedical Materials Science, Hannover Medical School, Carl-Neuberg-Straße 1, 30625, Hannover, Germany
| | - Bernd Breidenstein
- Institute of Production Engineering and Machine Tools, Leibniz University Hannover, An der Universität 2, 30823, Garbsen, Germany
| | - Sarah Busemann
- Institute of Production Engineering and Machine Tools, Leibniz University Hannover, An der Universität 2, 30823, Garbsen, Germany
| | - Andreas Greuling
- Department of Prosthetic Dentistry and Biomedical Materials Science, Hannover Medical School, Carl-Neuberg-Straße 1, 30625, Hannover, Germany.
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Karaokutan I, Aykent F, Özdoğan MS. Comparison of the Color Change of Porcelain Laminate Veneers Produced by Different Materials After Luting with Three Resin Cements. Oper Dent 2023; 48:166-175. [PMID: 36656333 DOI: 10.2341/21-099-l] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/18/2022] [Indexed: 01/20/2023]
Abstract
OBJECTIVES This study aimed to compare color change of porcelain laminate veneers fabricated with two lithium disilicate ceramics and a zirconia-reinforced lithium silicate ceramic material after luting with conventional dual-cure, amine-free dual-cure, or light-cure resin cements using artificial accelerated aging (AAA). METHODS AND MATERIALS Ninety noncarious human maxillary central incisors were embedded in autopolymerizing acrylic resin blocks to prepare conventional laminate veneers with incisal coverage. Prepared teeth were randomly divided into 3 groups (n=30) to fabricate laminate veneer restorations using: (1) lithium disilicate ceramic, (2) lithium disilicate ceramic with high-density micronization, and (3) zirconia-reinforced lithium silicate ceramic. Impressions of the preparations were taken with a laboratory scanner. Acquired 3D images were processed into a surface tessellation language file. Data were exported for 3D printing on a printer, and laminate veneers were printed in castable wax resin. Ceramic veneers were heat-pressed after investment according to the manufacturer's recommendations and further divided into three groups (n=10) according to luting cement type: (1) light-cure resin cement, (2) amine-free dual-cure resin cement, and (3) conventional dual-cure resin cement. Color measurements were performed from the middle of each specimen with a spectrophotometer before and after AAA for 300 hours with a total energy of 150 kJ/m2. Color changes were calculated with the CIEDE 2000 (ΔE00) formula. Color differences were assessed using two-way analysis of variance (ANOVA) (α=0.05), and the paired t-test was used to compare the L*, a*, and b* parameters in each group before and after aging. RESULTS There were no significant differences between the ceramic groups (p>0.05). The color changes of the materials ranged from 2.26 to 3.13. All materials were above the clinically acceptable limit (ΔE00>1.8). The conventional dual-cure resin cement group showed more color change (p>0.05). CONCLUSIONS Color changes were observed in all porcelain laminate veneers after artificial accelerated aging. The zirconia-reinforced lithium silicate veneers showed similar color changes as lithium disilicate veneers; the amine-free dual-cure resin cement showed a similar color change as light-cure resin cement after aging.
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Affiliation(s)
- I Karaokutan
- *Isil Karaokutan, PhD, DDS, MSc, Department of Prosthodontics, Faculty of Dentistry, Pamukkale University, Denizli, Turkey
| | - F Aykent
- Filiz Aykent, PhD, DDS, MSc, Department of Prosthodontics, Faculty of Dentistry, Ankara Yildirim Beyazit University, Ankara, Turkey
| | - M S Özdoğan
- Mahmut Sertaç Özdoğan, PhD, DDS, MSc, Department of Prosthodontics, Faculty of Dentistry, Ankara Yildirim Beyazit University, Ankara, Turkey
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Jadaan O, Esquivel-Upshaw J, Nemeth NN, Baker E. Proof testing to improve the reliability and lifetime of ceramic dental prostheses. Dent Mater 2023; 39:227-234. [PMID: 36707313 DOI: 10.1016/j.dental.2023.01.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Revised: 12/28/2022] [Accepted: 01/15/2023] [Indexed: 01/26/2023]
Abstract
OBJECTIVES Ceramic dental prostheses exhibit increasing failure rates with service time. In particular, veneered crowns and bridges are susceptible to chipping and other fracture modes of failure. The purpose of this manuscript is to introduce a computational methodology and associated software that can predict the time-dependent probability of failure for ceramic prostheses and subsequently design proof test protocols to significantly enhance their reliabilities and lifetimes. METHODS Transient reliability and corresponding proof testing theories are introduced. These theories are coded in the Ceramic Analysis and Reliability Evaluation of Structures (CARES/Life) code. This software will be used to demonstrate the predictive capability of the theory as well as its use in designing proof test protocols to significantly improve the reliability (survival probability) and lifetime for dental prostheses. A three-unit fixed dental prosthesis (FDP) with zirconia core (ZirCAD) and veneering ceramic (ZirPress) are used to compare the predicted probabilities of failure to general clinical results. In addition, the capability to use proof testing to significantly improve the performance (reliability and lifetime) for this restoration is demonstrated. RESULTS The probability of failure, Pf, after five years without proof testing is predicted to be 0.337. This compares to clinical studies showing the failure rate to be between 0.2 and 0.23 after 5 years. After 10 years, reference 18 found the clinical failure rate for similar bridges (but not the same) to be up to 0.28 compared to the predicted Pf of 0.38. The difference may be due to the analysis applying the load at an inclination of 75° which is more critical than vertical loading. In addition, clinical studies often report a simple survival rate instead of using Kaplan-Meier analysis to properly account for late enrollees. Therefore, true clinical failure rates may be higher than reported and may more closely match the predictions of this manuscript. The effectiveness of proof testing increases with selecting materials less susceptible to slow crack growth (higher SCG exponent, N). For example, proof testing the ZirPress glass-veneered bridges with N = 43.4 analyzed in this manuscript at 400 N bite force for 1 s which induces a failure rate during proof testing of 0.31, reduces the Pf of bridges not proof tested from 0.45 to an attenuated-proof-tested probability of failure Pfa of 0.21 after 20 years of usage. If another material is selected with improved resistance to SCG of N = 60 and the same loading conditions, the failure rate for the proof tested bridges after 20 years of service drops to 2 in 10,000 from 2.4 in 100 had they been not proof tested. The failure rate during proof testing for this material would be 5.1 in 100. Proof testing a material with absolutely no susceptibility to SCG at the same service load (in this case 285 N, not even the 400 N load used above) results in 0 % failure rate and is of course independent of time. SIGNIFICANCE The transient reliability and proof test theory presented in this paper and associated computational software CARES/Life were successful in predicting the performance of ceramic dental restorations when compared to clinical data. Well-designed proof test protocols combined with proper material selection can significantly enhance the reliabilities and lifetimes of ceramic prostheses. This proof test capability can be a translational technology if properly applied to dental restorations.
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Affiliation(s)
- Osama Jadaan
- Department of Mechanical Engineering, University of North Florida, Jacksonville, FL, USA.
| | | | | | - Eric Baker
- Connecticut Reserve Technologies, Inc., Cleveland, OH, USA
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Amaral M, Campos TMB, Takahashi T, Moura GSD, Ramos GF, Melo RMD, Özcan M. Water as Veneering Modeling Liquid Affects Microhardness of Glassy Matrix Veneering Ceramic. Eur J Prosthodont Restor Dent 2022; 30:262-266. [PMID: 35333011 DOI: 10.1922/ejprd_2372amaral05] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
PURPOSE/AIM To evaluate the effect of different veneering liquids used for modeling on microhardness, fracture toughness and biaxial flexural strength of a glass-veneering ceramic. MATERIAL AND METHODS The manufacturer recommended modeling liquid (ML), distilled water (DW), isopropyl alcohol (IA), 0.5% (P05), 1% (P1), and 2% (P2) polyethylene glycol solutions were mixed with feldspathic ceramic powder to form disc-shaped samples (n=20, 15 mm × 1.2 mm). After sintering, samples were mirror-polished and subjected to Vickers indentation (n=5) for measurement of microhardness and fracture toughness. The remaining 15 samples from each group were subjected to biaxial flexural strength. Data were subjected to one-way ANOVA and Weibull analysis. RESULTS The microhardness was affected by veneering liquid (p=0.002): DW promoted higher microhardness values than ML and IA. Fracture toughness (p=0.301) and flexural strength (p=0.930) were not affected by the veneering liquid but Weibull parameters were affected. All groups presented surface pores under high magnification. CONCLUSION Even though the use of DW led to higher values of surface microhardness than the ML, all obtained values are inside the range of enamel microhardness values reported in the literature. Such parameters may affect antagonist wear and should be reported in clinical trials.
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Affiliation(s)
- M Amaral
- Department of Dentistry, University of Taubaté, Rua dos Operários, n9, 12020-340, Taubaté, Brazil
| | - T M B Campos
- Technological Institute of Aeronautics, Physics Department, Praça Marechal Eduardo Gomes, 50, 12228-900, São José dos Campos, Brazil
| | - T Takahashi
- Department of Dentistry, University of Taubaté, Rua dos Operários, n9, 12020-340, Taubaté, Brazil
| | - G S D Moura
- Department of Dentistry, University of Taubaté, Rua dos Operários, n9, 12020-340, Taubaté, Brazil
| | - G F Ramos
- Department of Dental Materials and Prosthesis, São Paulo State University, Av. Eng. Francisco José Longo, 777, 12245-000, São José dos Campos, Brazil
| | - R M D Melo
- Department of Dental Materials and Prosthesis, São Paulo State University, Av. Eng. Francisco José Longo, 777, 12245-000, São José dos Campos, Brazil
| | - M Özcan
- Division of Dental Biomaterials, Center for Dental and Oral Medicine, University of Zürich, Plattenstrasse 11, 8032 Zürich, Switzerland
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No-Cortes J, Ayres AP, Son A, Lima JF, Markarian RA, da Silva RLB, Kim JH, Kimura RN, Cortes ARG. Computer-aided design expertise affects digital wax patterns of CAD/CAM laminate veneers more than single crowns. Int J Comput Dent 2022; 25:361-368. [PMID: 36426840 DOI: 10.3290/j.ijcd.b3555819] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
AIM There is controversy in the literature regarding clinical outcomes of CAD/CAM laminate veneers. The aim of the present study was to assess the impact of different levels of CAD expertise and different software programs on the reliability and reproducibility of digital wax patterns of laminate veneers and single crowns. MATERIALS AND METHODS The present preliminary in vitro study was performed on 10 prepared maxillary central incisors available in dental study models. Of the total, five central incisors were prepared with shoulder finish lines for single crowns, whereas the other five underwent incisal shoulder preparation for laminate veneers. The models were scanned using an intraoral scanner. Four dentists (group DENT) and four CAD dental technicians (group CAD) with expertise in different software programs performed digital diagnostic waxing on all prepared teeth. The resulting digital wax patterns (n = 80) were exported as standard tessellation language (STL) files and superimposed on gold standard digital wax patterns (obtained from the original shape of the teeth before preparations). 3D mesh deviations at the cervical margins as well as distal, mesial, and incisal/palatal surfaces between each STL and the gold standard digital wax patterns were calculated in millimeters using a CAD software program. The mean time required by each operator to perform digital waxing was also recorded. Paired comparisons between groups DENT and CAD as well as between nondental and dental software programs were performed for the crowns and laminate veneers using the Wilcoxon signed-rank and paired t tests (α = 0.05). RESULTS For group DENT, median deviations for single crowns were 0.15 mm (range: 0.08 to 1.05 mm) and for laminate veneers they were 0.15 mm (range: 0.08 to 0.76 mm). For group CAD, median deviations for single crowns were 0.16 mm (range: 0.09 to 0.73 mm) and for laminate veneers they were 0.10 mm (range: 0.06 to 0.53 mm). The Wilcoxon signed-rank test revealed a statistically significant difference between groups DENT and CAD (P = 0.041) and between the software programs (P = 0.029) for laminate veneers, but not for single crowns (P > 0.05). Furthermore, mean times required for group CAD and for dental software programs were significantly shorter than those for group DENT (P = 0.001) and for nondental software programs (P = 0.001), respectively. CONCLUSION Within the limitations of the present study, the findings suggest that CAD expertise and the software program significantly affect digital wax patterns for laminate veneers, but not for single crowns. (Int J Comput Dent 2022;25(4):361-0; doi: 10.3290/j.ijcd.b3555819).
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Ranjzad H, Heidari B, Rad FO, Hendi A, Ghorbani Z. Evaluation of Effect of Zirconia Surface Treatment with CO 2 and Nd:YAG Lasers on Shear Bond Strength between Zirconia Frameworks and Porcelain Veneers. J Contemp Dent Pract 2022; 23:1026-1032. [PMID: 37073917 DOI: 10.5005/jp-journals-10024-3412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/11/2023]
Abstract
AIM The purpose of this study was to evaluate the effect of zirconia surface treatment with CO2 and Nd:YAG laser on shear bond strength (SBS) between the zirconia framework and porcelain veneering. MATERIALS AND METHODS In this in vitro study, zirconia blocks were converted to 50 cubes and were divided randomly into 5 groups. After sintering (S), porcelain was applied in the control group. The surface treatment of the second to fifth groups included CO2 laser + (S), (S + CO2), Nd:YAG laser + (S), and (S + Nd), respectively. The SBS test was done, and data were analyzed by SPSS16 software. One sample was randomly chosen from each group and the type of failure was examined under scanning electron microscope (SEM). To compare the pairs of means, the least significant difference test was used and the determined significance level was 5% (p < 0.05). RESULTS The SBS of S + Nd group was significantly higher than the other ones, except for S + CO2 group. The least amount of SBS belonged to CO2 + S and the highest to S + Nd group. There were no significant differences between the other groups. CONCLUSION The bond strength of veneering porcelain to zirconia can be altered by surface treatments. It can also be affected by the type and sequence of laser and sintering application. The effect of Nd:YAG laser on the surface of zirconia, in order to create roughness to increase SBS, is better than that of CO2 laser. CLINICAL SIGNIFICANCE Surface treatment of zirconia by certain types of lasers reduces the chipping of the ceramic veneer and increases the success rate of all-ceramic restorations.
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Affiliation(s)
- Hadi Ranjzad
- Department of Prosthodontics, Dental Sciences Research Center, School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran
| | | | - Farzane Ostovar Rad
- Department of Maxillofacial Radiology, Dental Sciences Research Center, School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran
| | - Amirreza Hendi
- Department of Prosthodontics, Dental Sciences Research Center, School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran
| | - Zahra Ghorbani
- Department of Prosthodontics, Dental Sciences Research Center, School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran, Phone: +0098 9120248577, +0098 1332119328; e-mail:
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Moslemian N, Koulivand S, Zeighami S, Nankali A, Alikhasi M. Evaluation of the effect of milling mode and margin definition on adaptation of chairside digitally designed and fabricated ceramic veneers. Int J Comput Dent 2022; 25:277-285. [PMID: 35060370 DOI: 10.3290/j.ijcd.b2588153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
AIM The present study aimed to evaluate the effect of the milling mode and margin defining method on the marginal and internal adaptation of digitally designed and fabricated ceramic veneers. MATERIALS AND METHODS Forty extracted central incisors were prepared for ceramic veneers. The veneers were categorized into four groups (n = 10) based on the milling mode (fine or extra-fine) and design (automatic or manual defining of cervical and incisal margins). The veneers were cemented to the teeth using resin cement and then polished. After cementation, the teeth were embedded in clear polyester resin, then cut into three sections. Absolute marginal gap at the cervical margins (AMGC), marginal gap at the incisal (MGI) and cervical (MGC) margins, and internal gap (IG) at the axial wall were evaluated using a scanning electron microscope. Two-way analysis of variance (ANOVA) and t tests were used (α = 0.05) for the statistical analysis. RESULTS The margin defining method affected the adaptation of the internal and incisal margin; the automatic (software) margin defining method resulted in a smaller MGI (P = 0.038) and IG (P = 0.009) than the manual defining method. CONCLUSION The type of milling mode did not affect the marginal gap. The margin defining method affected the marginal gap at the incisal margin and the internal gaps. (Int J Comput Dent 2022;25(3):277-285; doi: 10.3290/j.ijcd.b2588153).
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Sirous S, Navadeh A, Ebrahimgol S, Atri F. Effect of preparation design on marginal adaptation and fracture strength of ceramic occlusal veneers: A systematic review. Clin Exp Dent Res 2022; 8:1391-1403. [PMID: 36062841 PMCID: PMC9760166 DOI: 10.1002/cre2.653] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2021] [Revised: 08/13/2022] [Accepted: 08/18/2022] [Indexed: 01/26/2023] Open
Abstract
OBJECTIVES This systematic review aims to investigate the effect of different preparation designs on the marginal fit and fracture strength of ceramic occlusal veneers. MATERIALS AND METHODS Based on the PICO question and the search terms, an electronic search was performed in Google Scholar, PubMed (MEDLINE), Scopus, Cochrane Library, Web of Science, Science Direct, Wiley, Ovid, and SAGE for articles published up to July 2022. After including English in vitro studies that evaluated posterior ceramic occlusal overlays at the posterior with ceramic restorations by following the PRISMA statement, the extracted data was tabulated. The methodological quality of the included studies was evaluated. Risk of bias assessment was done independently by two authors using the modified MINORS scale. RESULTS About 3138 search results were screened, of which 22 were selected due to their titles. Twenty-one full-text articles were assessed for eligibility. Seventeen in-vitro studies were finalized for the extraction of quantitative data. All 17 articles had a low risk of bias and were retained. The influencing items for evaluating the research were different in most studies; therefore, qualitative synthesis of the results was feasible. They generally included preparation design, material thickness, depth of preparation in the tooth, internal divergence angle, and finish line. Meta-analysis was not done due to heterogeneity of preparation types and evaluation methods. Results revealed that fracture resistance of occlusal veneers is higher than normal mastication force, and it is sufficient to prepare the occlusal surface, use a self-etching primer for bonding, and an acceptable minimum ceramic thickness. The marginal discrepancy of occlusal veneers is clinically acceptable. However, this systematic review faces some limitations due to the lack of in vivo studies, different preparation designs in included studies, different follow-ups, and lack of comprehensive explanations in articles. CONCLUSIONS The preparation design of occlusal veneers influences both marginal adaptation and fracture resistance. Various preparation designs are proven to have clinically acceptable fracture strength and marginal adaptation.
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Affiliation(s)
- Samin Sirous
- Departement of Prosthodontics, School of DentistryIslamic Azad University (Khorasgan Branch)IsfahanIran
| | | | - Saeedeh Ebrahimgol
- Department of Prosthodontics, School of DentistryTehran University of Medical SciencesTehranIran
| | - Faezeh Atri
- Department of Prosthodontics, Dental Research CenterDentistry Research Institute, Tehran University of Medical SciencesTehranIran
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de Oliveira AA, Vale GA, Almeida LDM, Saltarelo RC, Veríssimo C. Multidisciplinary approach for the closure of multiple diastemata with composite resin. Int J Esthet Dent 2022; 17:308-322. [PMID: 36047888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Morphologic anterior tooth alterations and diastemata between the anterior teeth are often considered a major esthetic problem. In most cases, the treatment of these conditions involves a multidisciplinary approach. Orthodontic treatment together with direct composite resin veneers are a viable option to close diastemata and alter tooth shape. The extent and etiology of the diastemata must be considered and properly evaluated for the treatment. The present article is a case report of a patient with multiple diastemata in the maxillary anterior teeth, dental crowding, and peg-shaped lateral incisors corrected with orthodontic treatment and direct composite resin veneers. Digital planning was the tool used to decide the tooth proportions before orthodontic treatment and to guide the diagnostic wax-up. An etch-and-rinse adhesive system was applied after etching. A polychromatic layering technique under rubber dam isolation was used for the composite resin veneer construction. Finishing and polishing procedures were achieved using polishing discs and abrasive materials. Direct composite resin is an alternative that allows predictability, esthetics, and the possibility of adjustments, resulting in patient satisfaction.
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Knezović Zlatarić D, Pongrac R, Soldo M. Shade management using a new zirconia-reinforced lithium disilicate press ceramic system and leucite-reinforced glass-ceramic veneering system. Int J Esthet Dent 2022; 17:324-338. [PMID: 36047889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The adhesive bonding technique together with tooth-colored ceramic material in fabricating veneers is considered one of the greatest achievements in modern prosthodontics. There is a wide range of indications for veneers, but they are most commonly used to establish adequate function and mask tooth discolorations and inappropriate tooth shape, size or position. A large variety of all-ceramic materials with excellent properties is available on the market today. It is challenging to select the material that will provide the best esthetics and function. The present article explains the principles of a modern, individual treatment approach for a young adult patient with multiple diastemata and shade disharmonies in the maxillary anterior teeth. The treatment plan was based on the selection of the appropriate ceramic material and technical procedures to achieve the best esthetic results using veneers. This included analyzing the specific case; defining the treatment goal; determining the precise shade; and selecting the most suitable and appropriate ceramic material, preparation design, fabrication technique, and adhesive concept. It was decided to use the new VITA zirconia-reinforced lithium disilicate press ceramic system and leucite-reinforced glass-ceramic veneering system to fabricate indirect ceramic veneers for all the maxillary anterior teeth. The size, shape, position, and shade of the natural teeth were changed and the diastemata were closed to achieve a more proportional dental relationship. The esthetic and functional goals were achieved and the patient was extremely satisfied with the final outcome.
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