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Robaian A, Alotaibi NM, Allaboon AK, AlTuwaijri DS, Aljarallah AF, Alshehri RS, Alabsi AA, Mirza MB, Al Moaleem MM. Factors Influencing Dentists' Choice of Restorative Materials for Single-Tooth Crowns: A Survey Among Saudi Practitioners. Med Sci Monit 2024; 30:e942723. [PMID: 38310349 PMCID: PMC10851618 DOI: 10.12659/msm.942723] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Accepted: 12/06/2023] [Indexed: 02/05/2024] Open
Abstract
BACKGROUND Material selection is crucial in restorative dentistry, influenced by aesthetics, material properties, and tooth location. This understanding is key for advancing dental practices and patient outcomes. The present study aimed to assess dentists' preferences for restorative materials in single-tooth crowns (SC) and how abutment tooth location and preparation margins influence these choices. MATERIAL AND METHODS A web-based pre-validated questionnaire survey was conducted among 811 actively practicing dentists in Saudi Arabia. RESULTS In posterior teeth, we found that ceramic was the most preferred material for SC regardless of the abutment tooth location and location of margins, followed by porcelain fused to metal (PFMs). In anterior teeth, ceramics were preferred, followed by CAD/CAM-based resin SC. Among the choice of ceramics in teeth for both supra-gingival margins, monolith zirconia was the most-preferred material for SC fabrication in posterior teeth, followed by zirconia-reinforced lithium silicate ceramic. Similarly, for sub-gingival margins, monolith zirconia crowns were the most popular option in posterior teeth among the respondents, with the highest in the mandibular molar region. In the anterior region, layered zirconia was the least preferred, and lithium disilicate ceramics was the most-favored option. A statistically significant difference existed between supra- and subgingival preparation for teeth 11 (P=0.01), 16 (P=0.03), and 34 (P=0.02). CONCLUSIONS Ceramic was the material of choice among Saudi dentists for replacement of SC, irrespective of the location and preparation margin. Monolith zirconia was usually selected for posterior teeth and lithium disilicate ceramics was the top choice in anterior teeth.
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Affiliation(s)
- Ali Robaian
- Conservative Dental Science Department, College of Dentistry, Prince Sattam bin Abdulaziz University, Al Kharj, Saudi Arabia
| | | | | | - Danah Saleh AlTuwaijri
- Resident, Saudi Board in Restorative Dentistry, Second Health Cluster, Riyadh, Saudi Arabia
| | - Abdullah Fahad Aljarallah
- Resident, Saudi Board in Family Dentistry, College of Dentistry, Riyadh Elm University, Riyadh, Saudi Arabia
| | - Rola Salman Alshehri
- Dental Student, College of Dentistry, Princess Nourah bint Abdul Rahman University, Riyadh, Saudi Arabia
| | | | - Mubashir Baig Mirza
- Conservative Dental Science Department, College of Dentistry, Prince Sattam bin Abdulaziz University, Al Kharj, Saudi Arabia
| | - Mohammed M. Al Moaleem
- Department of Prosthetic Dental Science, College of Dentistry, Jazan University, Jazan, Saudi Arabia
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Schierz O. Modern Polymers for Dental Application. Biomedicines 2024; 12:252. [PMID: 38397854 PMCID: PMC10886479 DOI: 10.3390/biomedicines12020252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Accepted: 01/18/2024] [Indexed: 02/25/2024] Open
Abstract
Ceramics dominate clinical procedures in modern dentistry related to the artificial replacement of teeth with fixed dental prostheses, replacing metal-based frameworks on a large scale [...].
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Affiliation(s)
- Oliver Schierz
- Department of Prosthetic Dentistry and Material Sciences, University of Leipzig, Liebigstr. 12, 04107 Leipzig, Germany
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Hu Y, Gao J, Huang X, Li Y, Chen Z, Zhan D, Sano H, Carvalho RM, Fu J. The possibility of clinical bonding between metal/ceramic brackets to zirconia: in vitro study. Front Bioeng Biotechnol 2024; 12:1354241. [PMID: 38288261 PMCID: PMC10822958 DOI: 10.3389/fbioe.2024.1354241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Accepted: 01/04/2024] [Indexed: 01/31/2024] Open
Abstract
Objective: The present study aimed to assess the bond strength and durability of six bonding agents concerning their application to metal or ceramic brackets and zirconia. Materials and Methods: Six resin cement bonding agents (XT, XTS, RSBU, RGBU, SBPM, and GMP) were chosen for this investigation. Specimens were either stored in distilled water at 37°C for 24 h or subjected to 5,000 thermocycles before conducting a Shear Bond Strength (SBS) test. Statistical analysis of the SBS data was performed using three-way ANOVA and Games-Howell tests (α = 0.05). The Adhesive Remnant Index was examined, and the debonding surface details on brackets and zirconia were observed. Results: For metal brackets, all groups demonstrated clinically acceptable bond strength, irrespective of storage conditions, except for the XT group. Regarding ceramic brackets, all groups displayed acceptable bond strength after 24 h of water storage. However, following thermocycling, a significant decrease in SBS was noted across all groups (p < 0.05), with SBPM exhibiting a higher bond strength. Three-way ANOVA analysis indicated that SBS values were notably influenced by each factor, and an interaction among the three independent variables was observed (p = 0.000). Conclusion: The reliable bond strength between ceramic brackets and zirconia was significantly lower after thermocycling compared to that of metal brackets and zirconia. SBPM exhibited consistent and robust bond strength between ceramic/metal brackets and zirconia across various storage conditions. Furthermore, the HEMA-free adhesive demonstrated a potentially more consistent bonding performance compared to the HEMA-containing adhesive employed in this study.
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Affiliation(s)
- Yichun Hu
- School and Hospital of Stomatology, China Medical University, Shenyang, China
| | - Jiayang Gao
- School and Hospital of Stomatology, China Medical University, Shenyang, China
| | - Xinyue Huang
- School and Hospital of Stomatology, China Medical University, Shenyang, China
| | - Yutong Li
- School and Hospital of Stomatology, China Medical University, Shenyang, China
| | - Ziyi Chen
- School and Hospital of Stomatology, China Medical University, Shenyang, China
| | - Desong Zhan
- Department of Dental Materials Science, The Second Department of Prosthodontics, School and Hospital of Stomatology, China Medical University, Shenyang, China
| | - Hidehiko Sano
- Department of Restorative Dentistry, Division of Oral Health Science, Faculty of Dental Medicine, Hokkaido University, Sapporo, Japan
| | - Ricardo M. Carvalho
- Department of Oral Biological and Medical Sciences, Division of Biomaterials, Faculty of Dentistry, University of British Columbia, Vancouver, BC, Canada
| | - Jiale Fu
- Department of Dental Materials Science, The Second Department of Prosthodontics, School and Hospital of Stomatology, China Medical University, Shenyang, China
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Schubert O, Goob J, Schweiger J, Güth JF, Edelhoff D, Graf T. Clinical performance of monolithic lithium disilicate hybrid abutment crowns over at least 3.5 years. J Prosthodont 2024; 33:34-40. [PMID: 37243453 DOI: 10.1111/jopr.13719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Accepted: 05/19/2023] [Indexed: 05/28/2023] Open
Abstract
PURPOSE Hybrid abutment crowns (HACs) made from monolithic ceramics represent an efficient option for single restorations on implants. However, long-term data are scarce. The purpose of this clinical trial was to evaluate the survival and complication rates of CAD-CAM fabricated HACs over a time period of at least 3.5 years. MATERIALS AND METHODS Twenty-five patients with a total of 40 HACs made of monolithic lithium disilicate ceramic bonded to a titanium base CAD-CAM abutment were retrospectively evaluated. All implants and screw-retained restorations were placed and manufactured in the same department of a university hospital. Only crowns that had been in service for more than 3.5 years were included in the study. HACs were evaluated regarding technical and biological complications. Functional Implant Prosthodontic Scores (FIPS) were obtained. RESULTS The mean observation time was 5.9 ± 1.4 years. Implant survival was 100%, and HAC survival was 97.5%. Over the observation period, one crown fracture was observed, necessitating refabricating of the restoration. Three minor biological complications were found. The overall mean FIPS score was 8.69 ± 1.12 points. CONCLUSIONS Within the limitations of this study, monolithic screw-retained HACs milled from lithium disilicate ceramics and bonded to titanium bases appeared to be a reliable treatment option over more than 3.5 years due to their low biological and technical complication rates.
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Affiliation(s)
- Oliver Schubert
- Department of Prosthetic Dentistry, University Hospital, LMU Munich, Munich, Germany
| | - Janosch Goob
- Department of Prosthetic Dentistry, University Hospital, LMU Munich, Munich, Germany
| | - Josef Schweiger
- Department of Prosthetic Dentistry, University Hospital, LMU Munich, Munich, Germany
| | - Jan-Frederik Güth
- Department of Prosthodontics, Center for Dentistry and Oral Medicine (Carolinum), Goethe-University Frankfurt am Main, Frankfurt am Main, Germany
| | - Daniel Edelhoff
- Department of Prosthetic Dentistry, University Hospital, LMU Munich, Munich, Germany
| | - Tobias Graf
- Department of Prosthodontics, Center for Dentistry and Oral Medicine (Carolinum), Goethe-University Frankfurt am Main, Frankfurt am Main, Germany
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Jurado CA, Bora PV, Azpiazu-Flores FX, Cho SH, Afrashtehfar KI. Effect of resin cement selection on fracture resistance of chairside CAD-CAM lithium disilicate crowns containing virgilite: A comparative in vitro study. J Prosthet Dent 2023:S0022-3913(23)00558-9. [PMID: 37739880 DOI: 10.1016/j.prosdent.2023.08.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Revised: 08/21/2023] [Accepted: 08/22/2023] [Indexed: 09/24/2023]
Abstract
STATEMENT OF PROBLEM Studies on the fracture performance of a recently introduced computer-aided design and computer-aided manufacturing (CAD-CAM) lithium disilicate ceramic containing virgilite with different cements are lacking. PURPOSE The purpose of this in vitro study was to evaluate the fracture resistance of crowns made of a recently introduced chairside CAD-CAM lithium disilicate containing virgilite cemented with different types of adhesive luting cement. MATERIAL AND METHODS Sixty complete coverage crowns for a maxillary right central incisor were milled out of a lithium disilicate with virgilite (CEREC Tessera) (n=48) and a traditional lithium disilicate (e.max CAD) (n=12) using a chairside CAD-CAM system (Primescan). The central incisor tooth preparation included a 1.5-mm incisal reduction, a 1.0-mm axial reduction, and a 1.0-mm chamfer finish line. The restorations were bonded with different types of resin cement to 3D printed dies of the tooth preparation and were divided into 5 groups (n=12 per group): e.max CAD with Multilink Automix (E.Mu); Tessera with Multilink Automix (T.Mu); Tessera with Calibra (T.Ca); Tessera with Unicem (T.Un); and Tessera with Speedcem (T.Sp). The cemented restorations were stored in water for 30 days and then loaded until they were fractured in compression. The load at fracture was analyzed with a 1-way analysis of variance (ANOVA) and the honestly significant difference (HSD) Tukey test (α=.05). RESULTS The mean fracture resistance of traditional lithium disilicate and virgilite lithium disilicate anterior crowns significantly differed depending on the type of resin cement used (P<.05). Group E.Mu displayed the highest values (946.35 ±155 N), followed by group T.Un (819.59 ±232 N), group T.Sp (675.52 ±153 N), and group T.Mu (656.95 ±193 N). The lowest values were displayed by group T.Ca (567.94 ±184 N). CONCLUSIONS The fracture resistance of lithium disilicate containing virgilite and traditional lithium disilicate crowns cemented with the same cement displayed statistically similar values. However, significant differences were observed when the virgilite lithium disilicate crowns were cemented with different types of adhesive luting cement. The crowns in the T.Ca group displayed the lowest fracture resistance.
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Affiliation(s)
- Carlos A Jurado
- Clinical Associate Professor, Department of Prosthodontics, The University of Iowa College of Dentistry and Dental Clinics, Iowa City, Iowa.
| | - Pranit V Bora
- Resident, Master of Sciences in Dental Materials Program, School of Dentistry, University of Alabama at Birmingham, Birmingham, Ala.
| | - Francisco X Azpiazu-Flores
- Assistant Professor, Department of Restorative Dentistry, Gerald Niznick College of Dentistry, University of Manitoba, Winnipeg, Manitoba, Canada; ITI Scholar, Department of Prosthodontics, Indiana University School of Dentistry, Indianapolis, Ind.
| | - Seok-Hwan Cho
- Associate Professor and Department Chair, Department of Prosthodontics, The University of Iowa College of Dentistry and Dental Clinics, Iowa City, Iowa.
| | - Kelvin I Afrashtehfar
- Assistant Professor and Director of Evidence-Based Practice Unit, Clinical Sciences Department, College of Dentistry, Ajman University, Ajman City, AE, United Arab Emirates; Adjunct Research Professor, Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, Bern, Switzerland; Senior Scientific Researcher, Artificial Intelligence Research Center (AIRC), Ajman University, Dubai, United Arab Emirates; and Visiting Professor, Department of Prosthodontics, College of Dentistry, Yonsei University, Seoul, Republic of Korea..
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Rosentritt PDM, Bollin D, Schmidt DMDMB, Rauch MDA. Stability and wear of zirconia crowns with micro-layering. J Dent 2023; 135:104560. [PMID: 37263411 DOI: 10.1016/j.jdent.2023.104560] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Revised: 05/02/2023] [Accepted: 05/22/2023] [Indexed: 06/03/2023] Open
Abstract
OBJECTIVES To investigate stability and wear of tooth-supported zirconia single crowns with micro-layering in-vitro. MATERIALS AND METHODS Molar crowns and specimens were fabricated from 5Y-TZP zirconia (Gen-X, Amann-Girrbach). Three groups were investigated: ML I: 0.1 mm cutback/painted/glazed (MiYO, Jensen); ML II: occlusal 0.3 mm cutback/painted/veneered/glazed (MiYO), and a monolithic control group (polished). After thermal cycling and mechanical loading (TCML), crowns were loaded to failure in a universal testing machine. Two-body wear test was performed. Wear (mean, maximum, antagonist) and roughness (Ra, Rz) were determined with a 3D laser-scanning-microscope. RESULTS All crowns survived TCML. In the control (2501.5 N) and ML II group (1775.3 N) significantly lower fracture forces were observed than in ML I (3636.4 N) (p ≤ 0.003). Significant wear differences were found (p ≤ 0.001) but not for antagonist wear (p ≥ 0.202). Lowest wear was observed in the control group 10.2±1.5 µm/28.8±6.4 µm, ML I 112.8±37.3 µm/152.9±42.8 µm, and ML II 192.4±49.1 µm/340.7±54.2 µm. Roughness was characterized by a Ra from 1.6 µm (control) to 3.0 µm (ML II), and a Rz from 11.8 µm (Control) to 24.0 µm (ML II). Roughness significantly differed between control group and ML I (p = 0.002) as well as ML I and ML II (p = 0.020). CONCLUSIONS Good in-vitro performance and fracture stability without chipping or fracture were found for all systems. Wear and roughness were comparable to conventional ceramic veneering systems. CLINICAL RELEVANCE The micro-layering of zirconia restorations can be recommended, yet the micro-layering could be worn during clinical application.
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Affiliation(s)
- Prof Dr Martin Rosentritt
- Department of Dental Prosthetics, University Hospital Regensburg, Franz-Josef-Strauß-Allee 11, 93053 Regensburg, Germany.
| | - Dirk Bollin
- Department of Dental Prosthetics, University Hospital Regensburg, Franz-Josef-Strauß-Allee 11, 93053 Regensburg, Germany
| | | | - Med Dent Angelika Rauch
- Department of Dental Prosthetics, University Hospital Regensburg, Franz-Josef-Strauß-Allee 11, 93053 Regensburg, Germany
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Rauch A, Lorenz L, Reich S, Hahnel S, Schmutzler A, Schierz O. Long-term survival of monolithic tooth-supported lithium disilicate crowns fabricated using a chairside approach: 15-year results. Clin Oral Investig 2023:10.1007/s00784-023-05023-0. [PMID: 37083987 DOI: 10.1007/s00784-023-05023-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Accepted: 04/11/2023] [Indexed: 04/22/2023]
Abstract
OBJECTIVES To investigate the clinical performance of chairside fabricated tooth-supported posterior single crowns from lithium disilicate ceramic. MATERIALS AND METHODS Thirty-four crowns (IPS e.max CAD, Ivoclar Vivadent, Schaan, Liechtenstein) were inserted between 2006 and 2007 and again evaluated after 15 years. Survival and success rates were calculated according to Kaplan-Meier, and the quality of the crowns was evaluated by using modified United States Public Health (USPHS) criteria. RESULTS Twenty-two crowns were available for recall; six patients were defined as dropouts. The mean observation period was 15.2 years (± 0.2). Six failures occurred (1 technical/5 biological) resulting in a survival rate of 80.1%. The success rate was 64.2%. The roughness of the crowns increased (p = 0.021) and the majority of adhesive gaps were discolored (p = 0.001) in comparison to baseline. The color, tooth, and crown integrity remained stable over the follow-up period (p ≥ 0.317). CONCLUSION The fabrication of tooth-supported lithium disilicate crowns using a chairside approach yielded acceptable long-term survival and success rates. Due to discoloration, the long-term use of dual-cure self-adhesive resin cements might result in unpleasing esthetic results. CLINICAL RELEVANCE The performance of posterior lithium disilicate single crowns revealed excellent to good clinical quality and an acceptable number of events after 15 years of clinical service.
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Affiliation(s)
- Angelika Rauch
- Department of Dental Prosthetics, University Hospital Regensburg, Franz-Josef-Strauß-Allee 11, 93053, Regensburg, Germany.
- Department of Prosthodontics and Materials Science, University of Leipzig, Liebigstr. 12, 04103, Leipzig, Germany.
| | - Lea Lorenz
- Department of Prosthodontics and Materials Science, University of Leipzig, Liebigstr. 12, 04103, Leipzig, Germany
| | - Sven Reich
- Department of Prosthodontics and Biomaterials, Centre of Implantology, Faculty of Medicine, RWTH University Hospital, Pauwellsstr. 30, 52074, Aachen, Germany
| | - Sebastian Hahnel
- Department of Dental Prosthetics, University Hospital Regensburg, Franz-Josef-Strauß-Allee 11, 93053, Regensburg, Germany
| | - Anne Schmutzler
- Department of Dental Prosthetics, University Hospital Regensburg, Franz-Josef-Strauß-Allee 11, 93053, Regensburg, Germany
| | - Oliver Schierz
- Department of Prosthodontics and Materials Science, University of Leipzig, Liebigstr. 12, 04103, Leipzig, Germany
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Clinical performance of CAD-CAM partial-coverage restorations: Experienced versus less-experienced operators. J Prosthet Dent 2022; 128:1245-1251. [DOI: 10.1016/j.prosdent.2022.09.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Revised: 09/19/2022] [Accepted: 09/20/2022] [Indexed: 11/06/2022]
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Newaskar PS, Sonkesriya S, Singh R, Palekar U, Bagde H, Dhopte A. Evaluation and Comparison of Five-Year Survival of Tooth-Supported Porcelain Fused to Metal and All-Ceramic Multiple Unit Fixed Prostheses: A Systematic Review. Cureus 2022; 14:e30338. [PMID: 36407172 PMCID: PMC9663878 DOI: 10.7759/cureus.30338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Accepted: 10/10/2022] [Indexed: 06/16/2023] Open
Abstract
The prosthesis must have good survival despite being functional for at least 5-10 years. This makes sure that the replacement of missing teeth does not become a repeated expense. Of 579 identified articles, 15 met the inclusion criteria for systematic review. Missing teeth replacement materials are divided into two groups: porcelain fused to metal and all ceramics. Data related to survival rates as well as the most common mode of failure is observed from both groups. It was observed that porcelain fused to metal prostheses had an approximately 99.5% survival rate and an approximately 92% survival rate for all-ceramic tooth-supported prostheses after five years of insertion. Porcelain-fused-to-metal (PFM) prostheses had a better survival rate after five years of insertion as compared to all-ceramic prostheses. Porcelain fused to metal should be the treatment of choice for dentists and patients when missing teeth need to be fixed.
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Affiliation(s)
- Prabha Shakya Newaskar
- Department of Prosthodontics, Rural Dental College, Pravara Institute of Medical Sciences - Deemed University (PIMS-DU), Loni, IND
| | - Subhash Sonkesriya
- Department of Prosthodontics, Government Dental College and Hospital, Indore, IND
| | - Rashmi Singh
- Department of Prosthodontics, Mansarovar Dental College, Hospital and Research Centre, Bhopal, IND
| | - Umesh Palekar
- Department of Prosthodontics, Rural Dental College, Pravara Institute of Medical Sciences - Deemed University (PIMS-DU), Loni, IND
| | - Hiroj Bagde
- Periodontology, Rama Dental College and Research Centre, Kanpur, IND
| | - Ashwini Dhopte
- Oral Medicine and Radiology, Rama Dental College and Research Centre, Kanpur, IND
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Roesner AJ, Schmohl L, Hahnel S, Fuchs F, König A, Rauch A. Acid resistance of self-adhesive resin luting cements - changes in surface texture parameters and microhardness. Dent Mater 2022; 38:1376-1384. [PMID: 35773036 DOI: 10.1016/j.dental.2022.06.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Revised: 05/29/2022] [Accepted: 06/05/2022] [Indexed: 11/15/2022]
Abstract
OBJECTIVES When consumed in excess, acidic foods and beverages can cause dental erosions leading to irreversible loss of tooth substance. In many cases, prosthetic rehabilitation of the damaged teeth is mandatory. The aim of this in vitro study was to investigate, for the first time on this scale, the resistance of various commonly used self-adhesive resin luting cements (Bifix SE, VOCO; G-Cem LinkAce, GC; RelyX Unicem, 3 M Oral Care; SpeedCEM Plus, Ivoclar ) against acidic media, and to find out whether they can withstand long-term exposure. These results were compared with an adhesive resin luting cement (Panavia V5, Kuraray) that functioned as reference gold standard. Furthermore we applied area roughness parameters for surface texture analysis in the present investigation, to highlight their advantages for investigations on the surface quality of resin luting cements. METHODS Six specimens with identical diameter (10 mm) and thickness (3 mm) were prepared from each self-adhesive and adhesive resin luting cement and forwarded to an incubation in various acidic media for a period of 232 h. Conductivity and pH-values of each acidic medium was analyzed for each material group prior (t 0) and after exposure (t 1). The specimens were examined for Vickers microhardness and surface quality. For the evaluation of surface roughness, the parameters Sa, Sdr, Spc Spk, Sk, and Svk were investigated by using different filtered surfaces (S-L; S-F) according to ISO 25 178. Statistical analysis was conducted at a significance level of α = 0.050. RESULTS For the evaluation of the acid resistance of self-adhesive resin luting cements investigations on conductivity and pH-value assessment of storage solution appear unsuitable, while the assessment of microhardness and surface analysis revealed valid data. It could be shown that changes in surface texture of the resin luting cements can be determinend in qualitative and quantitative manner. While the microhardness and surface quality of some resin luting cements hardly changed, others showed significantly reduced values in microhardness and changes in their surface quality (p < 0.001). SIGNIFICANCE The data of the current study emphasize the relevance of interactions between resin luting cements and acids and suggest further laboratory and clinical studies to elucidate its impact on the clinical performance of the materials investigated.
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Affiliation(s)
- Anuschka Josephine Roesner
- Department of Prosthetic Dentistry and Dental Material Science, Leipzig University, Germany; Department of Prosthetic Dentistry, Faculty of Medicine, Medical Center, Center for Dental Medicine, University of Freiburg, Germany.
| | - Leonie Schmohl
- Department of Prosthetic Dentistry and Dental Material Science, Leipzig University, Germany
| | - Sebastian Hahnel
- Department of Prosthetic Dentistry and Dental Material Science, Leipzig University, Germany; Department of Prosthetic Dentistry, UKR University Hospital Regensburg, Germany
| | - Florian Fuchs
- Department of Prosthetic Dentistry and Dental Material Science, Leipzig University, Germany
| | - Andreas König
- Department of Prosthetic Dentistry and Dental Material Science, Leipzig University, Germany
| | - Angelika Rauch
- Department of Prosthetic Dentistry and Dental Material Science, Leipzig University, Germany; Department of Prosthetic Dentistry, UKR University Hospital Regensburg, Germany
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Rhombohedral Phase Formation in Yttria-Stabilized Zirconia Induced by Dental Technical Tools and Its Impact on Dental Applications. MATERIALS 2022; 15:ma15134471. [PMID: 35806592 PMCID: PMC9267609 DOI: 10.3390/ma15134471] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 06/16/2022] [Accepted: 06/23/2022] [Indexed: 02/01/2023]
Abstract
In the study the influence of different dental technical tools on the surface temperature and phase composition of fixed dental prostheses (FDPs) made of yttria-partially stabilized zirconia polycrystals (3Y-/4Y-/5Y-PSZ) was investigated. FDPs were fabricated by using computer-aided manufacturing (CAM). The FDPs were treated with a contra-angle handpiece equipped with different burs and polishers. The resulting surface temperatures were measured with a thermographic camera, and the resulting phase transformations were investigated by X-ray diffraction and quantified by Rietveld refinement. Processing with burs resulted in no phase transformation, but a preferred orientation shift. Using coarse polisher induced a phase transformation to the rhombohedral phase, while fine polishers produced no relevant phase transformations and no preferred orientation shift. Compared to the monoclinic phase (ca. 9% theoretical volume increase), which is associated with low-temperature degradation (LTD), the rhombohedral phase is much more voluminous (ca. 15% theoretical volume increase) and distorted and, therefore, has a greater degradation potential.
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Hawthan M, Chrcanovic BR, Larsson C. Retrospective clinical study of tooth-supported single crowns: A multifactor analysis. Eur J Oral Sci 2022; 130:e12871. [PMID: 35613306 PMCID: PMC9546353 DOI: 10.1111/eos.12871] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Accepted: 04/24/2022] [Indexed: 11/28/2022]
Abstract
The purpose of the study was to investigate the influence of multiple factors on the survival of tooth‐supported single crowns and assess the biological and technical complications. This retrospective study included patients rehabilitated with single crowns with a minimum follow‐up time of 6 months after delivery. The cumulative survival rate was calculated over the maximum period of follow‐up time and reported in a life‐table survival analysis. Univariate and multivariate Cox regression was used to evaluate the associations between clinical covariates and crown failure. The included cohort group consisted of 1037 single crowns delivered in 401 patients and followed for a mean of 134.8 ± 80.2 months. Cumulative survival rate was 89.9% and 80.9% after 5 and 10 years and 70.5% and 61.8% after 15 and 20 years, respectively. The main reasons for single crown failure were loss of retention, tooth loss, and fracture. Anterior placement, non‐vital abutments, and bruxism significantly influenced the survival of single crowns. The survival of single crowns was not influenced by patient's age and sex, location of the crowns in relation to the jaws, type of tooth, presence of post and core, and type of crown material, treatment providers, or smoking. Anterior placement, non‐vital abutments, and bruxism are factors suggested to increase the risk of single crown failure and the prevalence of technical and biological complications.
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Affiliation(s)
- Mohammed Hawthan
- Department of Prosthodontics, Faculty of Odontology, Malmö University, Malmö, Sweden.,Department of Oral and Maxillofacial Surgery and Diagnostic Sciences, Faculty of Dentistry, Umm Al-Qura University, Makkah, Saudi Arabia
| | - Bruno R Chrcanovic
- Department of Prosthodontics, Faculty of Odontology, Malmö University, Malmö, Sweden
| | - Christel Larsson
- Department of Prosthodontics, Faculty of Odontology, Malmö University, Malmö, Sweden
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Elbishari H, Elsubeihi ES, Alkhoujah T, Elsubeihi HE. Substantial in-vitro and emerging clinical evidence supporting immediate dentin sealing. JAPANESE DENTAL SCIENCE REVIEW 2021; 57:101-110. [PMID: 34354787 PMCID: PMC8322125 DOI: 10.1016/j.jdsr.2021.05.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2020] [Revised: 03/26/2021] [Accepted: 05/27/2021] [Indexed: 02/07/2023] Open
Abstract
The application of resin adhesive to freshly cut dentin after teeth preparation, the so-called immediate dentin sealing (IDS) has been suggested as an alternative to the delayed dentin sealing (DDS), a technique in which resin adhesive is applied just before final bonding of indirect restorations. The aim of this review is to demonstrate the evidence of the claimed advantages made by the proponents of IDS technique. The results of this review revealed substantial in-vitro evidence supporting the IDS benefits including improved bond strength, reduced dentin permeability, improved restorations’ adaptation, and increased fracture strength of the restorations. Clinical studies have shown that IDS improves survival of ceramic laminate veneers bonded to prepared teeth with increased exposure of dentin. Moreover, it has been shown that IDS reduces post-cementation hypersensitivity in full coverage restorations, which is characterized by exposure of a large number of dentinal tubules. The selection of filled resin adhesive that is capable of producing thick adhesive layer appears to contribute to the success of the technique. Furthermore, careful management of the oxygen inhibition layer before conventional impression making and proper cleaning of the residual temporary cement used with provisional restorations appears to affect the outcome of the restorations.
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Affiliation(s)
- Haitham Elbishari
- Hamdan Bin Mohammed College of Dental Medicine, Mohammed Bin Rashid University of Medicine & Health Sciences, P.O. Box 505055, Dubai, United Arab Emirates
| | | | - Taif Alkhoujah
- Ajman University, P.O. Box 346, Ajman, United Arab Emirates
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Rauch A, Schrock A, Schierz O, Hahnel S. Material preferences for tooth-supported 3-unit fixed dental prostheses: A survey of German dentists. J Prosthet Dent 2021; 126:91.e1-91.e6. [PMID: 33849738 DOI: 10.1016/j.prosdent.2021.02.032] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Revised: 02/25/2021] [Accepted: 02/25/2021] [Indexed: 10/21/2022]
Abstract
STATEMENT OF PROBLEM Different material options are available for fixed dental prostheses (FDPs), but valid data on the favored materials of German dentists for 3-unit FDPs are lacking. It is unclear whether preferences depend on the individual characteristics of the dentists or their dental practices. PURPOSE The purpose of this survey was to identify the preferred material selection of German dentists for the fabrication of tooth-supported 3-unit FDPs depending on the location of the abutment teeth and the individual characteristics of the dentist or the dental practice. MATERIAL AND METHODS A survey was developed that included questions on the demographic characteristics (sex, area of expertise, age group, time since graduation, number of inhabitants, and the postal code of the dental practice or dental school) of the participating dentist and their preferred materials for the fabrication of tooth-supported 3-unit FDPs. Three clinical scenarios (anterior maxillary FDP, posterior maxillary FDP, posterior mandibular FDP) were presented. The dentists were allowed to select from predefined options or to give a free answer. For comparisons of characteristic associations, the number of inhabitants was chosen to represent the characteristics of the dental practice, and sex and time since graduation were selected to represent the characteristics of the dentist. Group comparisons were conducted with Chi-square tests (α=.05). RESULTS A response of 721 dentists from all parts of Germany was received, and data from 688 dentists were included in the analyses. Ceramic was the most preferred material for the fabrication of 3-unit FDPs independent of the location of the abutment teeth with veneered zirconia as the favored option. Metal-ceramic was ranked second. The time since graduation ≤15 years was associated with a preference of ceramic over metal-ceramic for the anterior restoration (P<.001). CONCLUSIONS Most participating dentists selected appropriate restorative materials depending on the individual clinical setting presented in the survey. For the anterior 3-unit FDP, time since graduation was associated with the preference for a restorative material. Some dentists selected lithium-X-silicate ceramics for situations beyond their recommended indication range.
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Affiliation(s)
- Angelika Rauch
- Assistant Professor, Department of Prosthetic Dentistry and Dental Materials Science, University of Leipzig, Leipzig, Germany.
| | - Annett Schrock
- Data Manager, Institute for Medical Informatics, Statistics and Epidemiology (IMISE) and Department of Prosthetic Dentistry and Dental Materials Science, University of Leipzig, Leipzig, Germany
| | - Oliver Schierz
- Assistant Professor, Department of Prosthetic Dentistry and Dental Materials Science, University of Leipzig, Leipzig, Germany
| | - Sebastian Hahnel
- Professor, Department of Prosthetic Dentistry and Dental Materials Science, University of Leipzig, Leipzig, Germany
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The Frequency of Dental Materials Use for Fixed Prostheses in a General Dental Practice. CURRENT HEALTH SCIENCES JOURNAL 2021; 47:393-397. [PMID: 35003771 PMCID: PMC8679156 DOI: 10.12865/chsj.47.03.09] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Figures] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Accepted: 08/18/2021] [Indexed: 11/04/2022]
Abstract
This retrospective study aimed to evaluate the frequency of dental materials use for fixed prosthesis depending on the location of the teeth, the restorative prosthetic type, the age and sex of the patients from a dental practice in Essen, Germany. The analysis of the collected data showed that zirconia is currently the most common material for making dental fixed prostheses, a larger number of prosthetic elements for women and a significant increase for these restorations at ages over 40 years. Most of the prosthetic elements were made in the mandibular molar area, with an increased frequency of zirconia bridges in the mandible, while for the upper jaw the number of crowns was higher. Zirconia was more frequent used in female patients and in the age group 60-69.
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Rauch A, Hahnel S, Günther E, Bidmon W, Schierz O. Tooth-Colored CAD/CAM Materials for Application in 3-Unit Fixed Dental Prostheses in the Molar Area: An Illustrated Clinical Comparison. MATERIALS 2020; 13:ma13245588. [PMID: 33302336 PMCID: PMC7762353 DOI: 10.3390/ma13245588] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Revised: 12/01/2020] [Accepted: 12/04/2020] [Indexed: 12/28/2022]
Abstract
The aim of this study was to compare the clinical properties of tooth-colored computer-aided design/computer-aided manufacturing (CAD/CAM) materials for the fabrication of a 3-unit fixed dental prostheses (FDPs) in the same clinical scenario. A 53-year-old female patient was supplied with a 3-unit FDP to replace a second premolar in the upper jaw. Restorations were fabricated from 3 mol%, 4 mol%, and 5 mol% yttrium oxide zirconia, zirconia with translucency gradient, indirect composite resin, polyetheretherketone (PEEK), and polyetherketoneketone (PEKK). Milling time, weight, and radiopacity were investigated. Esthetics were examined following the US Public Health Service criteria (USPHS). The milling time for zirconia was twice as high as for the indirect composite resin, PEEK, or PEKK. The latter materials had a weight of 2 g each, while zirconia restorations yielded 5 g. Zirconia presented intense radiopacity. PEEK and PEKK required veneering and an opaquer was applied to the PEKK framework. All FDPs showed acceptable esthetics. PEEK and PEKK restorations were featured by a grayish shimmering. A variety of CAD/CAM materials are available to fabricate 3-unit FDPs with esthetically acceptable results. In the esthetic zone, PEEK and PEKK require veneering and an opaquer might be applied. Milling time, weight, and radiopacity were relatively high for zirconia FDPs.
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