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Zhu J, Zhao K, Gu X. Research progress on accuracy of intraoral digital impressions for implant-supported full-arch prostheses. Zhejiang Da Xue Xue Bao Yi Xue Ban 2024:1-9. [PMID: 38832462 DOI: 10.3724/zdxbyxb-2024-0079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2024]
Abstract
With the rapid development of implant techniques and digital technology, digital impressions have become a commonly used impression method in implant restoration. At present, the accuracy of intraoral digital impressions directly applied to implant-supported full-arch prostheses remains inadequate, which is due to the high accuracy requirement of full-arch implant impressions, while there are still technical challenges in intraoral digital impressions about recognition and stitching. In this regard, scholars have proposed a variety of scanning strategies to improve the accuracy of intraoral scan, including mucosal modifications, auxiliary devices and novel scan bodies. At the same time photogrammetry, as a new digital impression technique, has been developing steadily and exhibits promising accuracy. This article reviews the research progress on the accuracy of edentulous full-arch implant impressions and techniques which can improve the accuracy of intraoral digital impressions, to provide reference for clinical application.
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Affiliation(s)
- Jieying Zhu
- Department of Stomatology, the First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310003, China.
- Department of Stomatology, Zhejiang University School of Medicine, Hangzhou 310058, China.
| | - Ke Zhao
- Department of Stomatology, the First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310003, China
- Department of Stomatology, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Xinhua Gu
- Department of Stomatology, the First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310003, China.
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Canullo L, Pesce P, Caponio VCA, Iacono R, Luciani FS, Raffone C, Menini M. Effect of auxiliary geometric devices on the accuracy of intraoral scans in full-arch implant-supported rehabilitations: An in vitro study. J Dent 2024; 145:104979. [PMID: 38556193 DOI: 10.1016/j.jdent.2024.104979] [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: 12/10/2022] [Revised: 03/14/2024] [Accepted: 03/28/2024] [Indexed: 04/02/2024] Open
Abstract
OBJECTIVES The aim of the present in vitro study was to evaluate the effect of a novel auxiliary geometric device (AGD) on the accuracy of full-arch scans captured with 3 different intraoral scanners (IOS). METHODS An edentulous maxillary model with four internal connection implant replicas was scanned using 3 different IOS: iTero Element 5D (ITERO) (Align Technology, Tempe, AZ, USA), Trios 4 (TRIOS) (3Shape A/S, Copenhagen, Denmark), and Carestream 3700 (CS) (Carestream Dental, Atlanta, USA). Thirty-six scans were taken with each IOS, 18 with the AGD in place, and 18 without the AGD. A digital master model was created using an industrial optical scanner (ATOS compact Scan 5M, GOM GmbH, Braunschweig, Germany). The master and IOS models were aligned using the scan bodies as a reference area. A surface comparison was performed, and deviation labels were exported for each scan body to evaluate the linear and angular deviation. Total body, platform and angular deviations were measured. RESULTS The use of AGD resulted in a statistically significant increase of angular deviation: 0.87° (SD=0.21) in the AGD group versus 0.64° (SD=0.46) in the no AGD group (p-value=0.005). The difference between the AGD and no AGD groups was not statistically significant for total body and platform deviation values (p-value=0.051 and 0.302 respectively). Using AGD, ITERO showed a statistically significant increase in angular deviation (mean difference=-0.46 µm, p-value=0.002) and a decrease in mean platform deviation (mean difference=63.19 µm, p-value<0.001). No statistically significant differences were found for the other IOS. CONCLUSIONS The use of AGD did not add benefit on CS and TRIOS. On ITERO, there was an improvement in platform deviation, that was outweighed by the worsening of the angular deviation. CLINICAL SIGNIFICANCE In vitro data suggest that intraoral scans can be successfully used in full-arch cases. The use of AGD has no additional benefit on CS and TRIOS. On ITERO there was an improvement in platform deviation that was outweighed by the worsening of the angular deviation. Translational application to clinical practice deserves further investigation, taking into account patient-related and anatomical variables.
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Affiliation(s)
- Luigi Canullo
- Department of Surgical Sciences, University of Genova, Italy
| | - Paolo Pesce
- Department of Surgical Sciences, University of Genova, Italy.
| | | | | | | | | | - Maria Menini
- Department of Surgical Sciences, University of Genova, Italy
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Nuytens P, Grande F, D'haese R, Salameh Z, Lepidi L. Novel complete-arch pillar system (CAPS) to register implant position and maxillomandibular relationship in one single visit. J Dent 2024; 143:104885. [PMID: 38346663 DOI: 10.1016/j.jdent.2024.104885] [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: 11/11/2023] [Revised: 01/28/2024] [Accepted: 02/07/2024] [Indexed: 02/23/2024] Open
Abstract
OBJECTIVES This article presents a novel complete-arch pillar system (CAPS) to register implant position and maxillomandibular relationship in one single visit for implant-supported fixed complete dental prostheses (IFCDPs). MATERIAL AND METHODS The novel system presents a 3-unit toolset comprising intraoral scan bodies (ISBs), lateral pillar attachments (LPAs) and occlusal pillar attachments (OPAs). A 2-stage single visit workflow by an intraoral scanner (Trios 5) was introduced. The first stage "Screw-Scan-Done" was used to describe complete-arch intraoral implant scanning using LPAs. The second stage "Screw-Occlude-Done" involved virtual occlusal recording using OPAs. Two patients with one single edentulous arch were selected for this study. In the first patient, 6 bone level implants (Bone Level Tapered, Straumann) were placed in the edentulous maxilla at positions 12, 14, 16, 22, 24 and 26. In the second patient, 4 bone level implants (NobelActive CC, Nobel Biocare) were placed in the edentulous mandible at positions 32, 35, 42 and 45. A CAD-CAM procedure was initiated with the acquired IOS data to fabricate an interim IFCDP at the same day. Periapical radiographs were obtained of the implant-prosthetic connection of the definitive IFCDPs to verify the passive fit. Metrology software (Geomagic Qualify, 3D Systems - Matlab, Mathworks) was used to assess the implant analogs position in the 3D-printed casts used for fabricating the definitive IFCDPs. A quantitative occlusal relationship analysis was performed with IOS. RESULTS Radiographic examination revealed no gaps at implant-prosthetic connection of the definitive IFCDPs. The 3D-printed casts showed an overall average distance deviation within the clinically acceptable range of errors of 150 µm. Quantitative occlusal relationship analysis with IOS showed well-distributed contacts. CONCLUSION Within the limitations of this study, the following conclusions can be drawn: (1) A 3-unit toolset with ISBs, LPAs and OPAs allows to register the implant position and maxillomandibular relationship in one single visit; (2) the 2-stage clinical workflow with the CAPS system facilitates the IOS data acquisition for fabrication of an interim IFCDP at the same day; (3) a passive fit was demonstrated for the interim and the definitive IFCDPs. CLINICAL SIGNIFICANCE The CAPS system can help clinicians to register the implant position and the maxillomandibular relationship in one single visit for the fabrication of an IFCDP.
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Affiliation(s)
- Philippe Nuytens
- Department of Reconstructive Dentistry, Faculty of Medicine and Health Sciences, Ghent University, C. Heymanslaan 10, 9000 Ghent, Belgium.
| | - Francesco Grande
- Department of Prosthodontics, University of Ferrara, Ferrara, Italy; Department of Mechanical and Aerospace Engineering, Politecnico di Torino, Turin, Italy
| | - Rani D'haese
- Department of Reconstructive Dentistry, Faculty of Medicine and Health Sciences, Ghent University, C. Heymanslaan 10, 9000 Ghent, Belgium
| | - Ziad Salameh
- Professor and Director, Research Center, Faculty of Dental Medicine, Lebanese University Beirut, Lebanon
| | - Luca Lepidi
- Adjunct Professor, Department of Prosthodontics, University of Ferrara, Italy
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Rutkunas V, Dirse J, Kules D, Mischitz I, Larsson C, Janda M. Misfit simulation on implant prostheses with different combinations of engaging and nonengaging titanium bases. Part 2: Screw resistance test. J Prosthet Dent 2024; 131:262-271. [PMID: 35981927 DOI: 10.1016/j.prosdent.2022.04.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2021] [Revised: 04/24/2022] [Accepted: 04/25/2022] [Indexed: 11/19/2022]
Abstract
STATEMENT OF PROBLEM Prosthesis fit is 1 of the main factors influencing the success and survival of an implant-supported screw-retained restoration. However, scientific validation of the performance of engaging and nonengaging components in a fixed partial denture (FPD) and the effect of their combinations on the fit of FPDs is lacking. The screw resistance test has been used for the fit assessment of screw-retained FPDs. However, objective assessments by using analog and digital devices are now available. PURPOSE The purpose of this in vitro study was to investigate the effect of engaging and nonengaging components on the fit of screw-retained frameworks, supported by 2 conical connection implants with simulated vertical and horizontal misfits, by performing 2 different screw resistance tests (analog and digital). MATERIAL AND METHODS Thirty 2-implant-supported bar-shaped zirconia frameworks cemented on two 2-mm titanium bases were fabricated and divided into 3 groups (n=10) according to different abutment combinations: both engaging, engaging and nonengaging, both nonengaging. The fit of each framework was tested on the control cast and on 6 definitive casts simulating 50-, 100-, and 150-μm vertical and 35-, 70-, and 100-μm horizontal misfit levels. The abutment screws were tightened on each implant, and the screw rotation angle was measured both digitally, with a custom-made digital torque wrench and a computer software program, and conventionally, with an analog torque wrench and protractor. Clearly ill-fitting specimens were excluded. The data were statistically analyzed by 1-way analysis of variance (ANOVA) and the Tukey post hoc test (α=.05). RESULTS Both engaging specimens on the 100-μm horizontal misfit group and on all vertical misfit groups were clearly ill-fitting and excluded. Statistically significant differences among groups with different combinations of abutments were found (P<.05). The engaging abutments had a higher angle of rotation than the nonengaging abutments on all casts. In the horizontal misfit group, both engaging specimens had the highest angle of rotation, followed by engaging and nonengaging and both engaging specimens. In the vertical misfit group, the engaging and nonengaging specimens had the highest angle of rotation on the side of the engaging abutment. The angle of rotation increased with the increasing level of misfit. CONCLUSIONS Both nonengaging frameworks showed superiority in misfit tolerance, as the angle of rotation was lower than that of the engaging and nonengaging and both engaging frameworks. Conventional and digital torque wrenches showed similar results.
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Affiliation(s)
- Vygandas Rutkunas
- Professor, Department of Prosthodontics, Faculty of Medicine, Institute of Odontology, Vilnius University, Vilnius, Lithuania
| | - Julius Dirse
- Postgraduate student, Faculty of Medicine, Institute of Odontology, Vilnius University, Vilnius, Lithuania
| | - Daniel Kules
- Undergraduate student, Faculty of Medicine, Institute of Odontology, Vilnius University, Vilnius, Lithuania
| | - Ingrida Mischitz
- Dental Research Assistant, Department of Dental Medicine and Oral Health, Medical University of Graz, Graz, Austria
| | - Christel Larsson
- Associate Professor, Faculty of Odontology, Malmö University, Malmö, Sweden
| | - Martin Janda
- Assistant Professor, Faculty of Odontology, Malmö University, Malmö, Sweden.
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Pozzi A, Agliardi E, Lio F, Nagy K, Nardi A, Arcuri L. Accuracy of intraoral optical scan versus stereophotogrammetry for complete-arch digital implant impression: An in vitro study. J Prosthodont Res 2024; 68:172-180. [PMID: 37574278 DOI: 10.2186/jpr.jpr_d_22_00251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/15/2023]
Abstract
PURPOSE To assess and compare the accuracies of intraoral scanners (IOS) and stereophotogrammetry (SPG) devices for complete-arch digital implant impressions. METHODS A 4-analog model was digitized using a desk scanner to obtain a reference file. Thirty test scans were conducted using the investigated IOS device, while an additional 30 scans were performed using the SPG device. Using the best-fit algorithm, the resulting 60 test files were aligned with the reference file. Linear (ΔX, ΔY, and ΔZ-axis) and angular deviations (ΔANGLE) were evaluated. Three-dimensional (3D) deviation was calculated based on the Euclidean distance (ΔEUC). The analysis was stratified according to the scanning device and implant position. Fisher's F and t-tests were used to compare the variances and expected values of the two scanning systems. RESULTS IOS expressed a higher 3D (ΔEUC) mean deviation than SPG (52.8 µm vs. 33.4 µm, P < 0.0001), with extreme measurements up to 181.9 µm. A significantly higher standard deviation (SD) was associated with IOS (37.1 µm vs. 17.7 µm, P < 0.0001). Considering angular deviations, the IOS showed slightly higher angular mean deviations (ΔANGLE) than the SPG (0.28° vs. 0.24°, P = 0.0022), with extreme measurements of up to 0.73°. The SPG SD values were significantly lower than the IOS SD values (0.14° vs. 0.04°, P < 0.0001). CONCLUSIONS The SPG showed significantly higher 3D and angular accuracies for complete arch implant impressions, with consistent repeatability. IOS scanning revealed significantly higher extreme deviations exceeding the acceptable threshold value. Despite study limitations, SPG appears more feasible than IOS for complete-arch digital implant impressions.
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Affiliation(s)
- Alessandro Pozzi
- Goldstein Center for Esthetic and Implant Dentistry, Department of Restorative Sciences, Augusta University, Augusta, USA
- Department of Clinical Sciences and Translational Medicine, School of Dentistry, University of Tor Vergata, Rome, Italy
| | - Enrico Agliardi
- Dentistry Department, Vita e Salute San Raffaele University, Milan, Italy
| | - Fabrizio Lio
- Department of Chemical Science and Technologies, Materials for Health, Environment and Energy - Dentistry, University of Tor Vergata, Rome, Italy
| | - Katalin Nagy
- Department of Oral Surgery, University of Szeged, Szeged, Hungary
| | - Alessandra Nardi
- Department of Mathematics, University of Rome Tor Vergata, Rome, Italy
| | - Lorenzo Arcuri
- Department of Odontostomatological and Maxillofacial Sciences, Sapienza University, Rome, Italy
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Ma J, Zhang B, Song H, Wu D, Song T. Accuracy of digital implant impressions obtained using intraoral scanners: a systematic review and meta-analysis of in vivo studies. Int J Implant Dent 2023; 9:48. [PMID: 38055096 DOI: 10.1186/s40729-023-00517-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2023] [Accepted: 11/28/2023] [Indexed: 12/07/2023] Open
Abstract
PURPOSE This systematic review aimed to investigate the accuracy of intraoral scan (IOS) impressions of implant-supported restorations in in vivo studies. METHODS A systematic electronic search and review of studies on the accuracy of IOS implant impressions were conducted to analyze the peer-reviewed literature published between 1989 and August 2023. The bias analysis was performed by two reviewers. Data on the study characteristics, accuracy outcomes, and related variables were extracted. A meta-analysis of randomized control trials was performed to investigate the impact of IOS on peri-implant crestal bone loss and the time involved in the impression procedure. RESULTS Ten in vivo studies were included in this systematic review for final analysis. Six studies investigated the trueness of IOS impressions, but did not reach the same conclusions. One study assessed the precision of IOS impressions for a single implant. Four clinical studies examined the accuracy of IOS implant impressions with a follow-up of 1-2 years. In full arches, IOS impression procedure needed significantly less time than conventional one (mean difference for procedure time was 8.59 min [6.78, 10.40 min], P < 0.001), prosthetic survival rate was 100%, and marginal bone levels of all participants could be stably maintained (mean difference in marginal bone loss at 12 months was 0.03 mm [-0.08, 0.14 mm], P = 0.55). CONCLUSIONS The accuracy of IOS impressions of implant-supported restorations varied greatly depending on the scanning strategy. The trueness and precision of IOS in the partial and complete arches remain unclear and require further assessment. Based on follow-up clinical studies, IOS impressions were accurate in clinical practice. However, these results should be interpreted with caution, as some evidences are obtained from the same research group.
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Affiliation(s)
- Jie Ma
- Department of Implant Dentistry, Shanghai Xuhui District Dental Center, No.500 Fenglin Road, Shanghai, 200032, China
| | - Binghua Zhang
- Department of Implant Dentistry, Shanghai Xuhui District Dental Center, No.500 Fenglin Road, Shanghai, 200032, China
| | - Hao Song
- Department of Oral Maxillofacial-Head and Neck Oncology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200011, China
| | - Dongle Wu
- Department of Implant Dentistry, Shanghai Xuhui District Dental Center, No.500 Fenglin Road, Shanghai, 200032, China
| | - Tao Song
- Department of Implant Dentistry, Shanghai Xuhui District Dental Center, No.500 Fenglin Road, Shanghai, 200032, China.
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Wu HK, Wang J, Chen G, Huang X, Deng F, Li Y. Effect of novel prefabricated auxiliary devices attaching to scan bodies on the accuracy of intraoral scanning of complete-arch with multiple implants: An in-vitro study. J Dent 2023; 138:104702. [PMID: 37714453 DOI: 10.1016/j.jdent.2023.104702] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2023] [Revised: 09/08/2023] [Accepted: 09/12/2023] [Indexed: 09/17/2023] Open
Abstract
OBJECTIVES To examine the effect of novel prefabricated auxiliary devices with different geometric features called Scan Body Clasp (SBC) at different levels on the accuracy of intraoral scanning of complete-arch with multiple implants. METHODS An edentulous maxilla 4-implant model and SBCs with different geometric features (flat or curved) were fabricated by a 3D printer (AccuFab-C1s, 3DShining, Hangzhou, China). Test scans were performed using an intraoral scanner (Aoralscan 3, 3DShining, Hangzhou, China) software version 1.0.0.3104 under different scenarios: group A (CO), without any SBCs; group B&C (LC&HC), with curved SBCs adjacent to and away from the mucosa; group D&E (LF&HF), with flat SBCs adjacent to and away from the mucosa. 20 scans were done for each group (CO, LC, HC, LF and HF). Reference Scans were obtained by digitizing the model in group A using a dental laboratory scanner (D2000, 3Shape, Copenhagen, Denmark). The related files were imported into inspection software for trueness and precision assessment. Statistical analysis was performed with One-way ANOVA, Independent-Sample T test for trueness values. Kruskal-Wallis test and Mann-Whitney test were used to assess the precision values. The level of significance was set at α=0.05. RESULTS Groups with SBCs demonstrated trueness enhancement, among which LF revealed the best trueness. Significant differences were also found between LF and HC (p < .01), LF and HF (p < .001), LC and HF (p < .01). LF and HF showed precision enhancement. The best precision was LF, which was found to be more precise than LC (p < .001) and HC (p < .001). HF was more precise than LC (p < .001) and HC (p < .001). CONCLUSIONS Attaching the scan bodies with SBCs at different levels significantly influenced the scanning accuracy. The SBCs near the mucosa result in superior trueness, while the flat morphology benefits the precision. CLINICAL SIGNIFICANCE The results demonstrated the feasibility of the SBCs in enhancing intraoral complete-arch implant scanning accuracy. Among the configurations tested in the present study, low-level and flat surfaces of the artificial landmarks may be the potential pivotal elements to optimizing long-span scanning accuracy.
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Affiliation(s)
- Hio Kuan Wu
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510055, PR China
| | - Jing Wang
- YangHe Dental Clinic, Guangzhou 510055, PR China
| | - Guanhui Chen
- Department of Stomatology, the Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen, Guangdong, 518107, PR China
| | - Xiaoqiong Huang
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510055, PR China
| | - Feilong Deng
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510055, PR China
| | - Yiming Li
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510055, PR China.
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Yan Y, Lin X, Yue X, Geng W. Accuracy of 2 direct digital scanning techniques-intraoral scanning and stereophotogrammetry-for complete arch implant-supported fixed prostheses: A prospective study. J Prosthet Dent 2023; 130:564-572. [PMID: 35667889 DOI: 10.1016/j.prosdent.2022.03.033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 03/01/2022] [Accepted: 03/02/2022] [Indexed: 10/18/2022]
Abstract
STATEMENT OF PROBLEM Conventional impression techniques for complete arch implant-supported prostheses are technique-sensitive. Stereophotogrammetry (SPG) and intraoral scanning (IOS) may offer an alternative to conventional impression making. PURPOSE The purpose of this prospective study was to compare the accuracy of IOS and SPG for complete arch implant scans and to evaluate the passive fit of frameworks fabricated with SPG. MATERIAL AND METHODS Laboratory scanning of gypsum casts, SPG, and IOS were performed for all participants. The data regarding the abutment platform were superimposed to calculate the 3D deviation of SPG and IOS compared with that of laboratory scanning as an evaluation of accuracy. The effect of implant position and number on accuracy was analyzed. The more accurate technique between SPG and IOS was used to fabricate the titanium frameworks, as was laboratory scanning. The passive fit of the frameworks was assessed by clinical examination, the Sheffield test, and panoramic radiography. RESULTS Seventeen participants (21 arches, 120 implants) were included. The accuracy of SPG ranged from 2.70 μm to 92.80 μm, with a median (Q1, Q3) of 17.00 (11.68, 22.50) μm, which was significantly more accurate than that of IOS, ranging from 21.30 μm to 815.60 μm, with a median (Q1, Q3) of 48.95 (34.78, 75.88) μm. No significant correlation was found between position or number of implants and 3D deviation in the SPG group. A weak positive correlation was found between implant number and 3D deviation in the IOS group. SPG and laboratory scanning were used to fabricate titanium frameworks. The passive fit between the frameworks and abutment platforms was confirmed. CONCLUSIONS SPG, which was not affected by position or number of implants, was more accurate than IOS and comparable with laboratory scanning. The frameworks fabricated based on SPG and laboratory scanning were comparable in their passive fit. The SPG technique may be an alternative to laboratory scanning for complete arch implant scans.
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Affiliation(s)
- Yuwei Yan
- Graduate student, Department of Dental Implant Center, Beijing Stomatological Hospital, School of Stomatology, Capital Medical University, Beijing, PR China
| | - Xiao Lin
- Attending physician, Department of Dental Implant Center, Beijing Stomatological Hospital, School of Stomatology, Capital Medical University, Beijing, PR China
| | - Xinxin Yue
- Attending physician, Department of Dental Implant Center, Beijing Stomatological Hospital, School of Stomatology, Capital Medical University, Beijing, PR China
| | - Wei Geng
- Professor, Department of Dental Implant Center, Beijing Stomatological Hospital, School of Stomatology, Capital Medical University, Beijing, PR China.
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Pereira ALC, de Luna Gomes JM, Campos MDFTP, de Medeiros AKB, Torres ACSP, Pellizzer EP, Carreiro ADFP. Device trueness in passivity and misfit of CAD-CAM frameworks: Conventional versus printed casts. J Prosthet Dent 2023:S0022-3913(23)00548-6. [PMID: 37748995 DOI: 10.1016/j.prosdent.2023.07.039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2022] [Revised: 07/18/2023] [Accepted: 07/18/2023] [Indexed: 09/27/2023]
Abstract
STATEMENT OF PROBLEM Obtaining a passive and well-adapted framework is challenging when intraoral scanning edentulous arches with multiple implants. The trueness of the printed casts is unclear. PURPOSE The purpose of this clinical study was to evaluate the trueness of frameworks made from conventional and printed casts regarding clinical passivity and misfit. MATERIAL AND METHODS Ten participants with complete mandibular fixed implant-supported interim prostheses retained by 4 implants were included. Each participant had a conventional impression and a digital scan made. The digital scan was made using an innovative device. Both conventional and digital casts were made, and the virtual images were used for milling the digital framework in cobalt chromium alloy. All frameworks were evaluated for passivity and marginal vertical misfit with the single screw test, with 4 attempts consisting of the tightened screw position, a test with all screws tightened, and an interspersed tightening test. The Kruskal-Wallis test was used to evaluate the trueness of the tested device for framework construction through the single screw test on vertical marginal misfit in the conventional and printed groups (α=.008). The Friedman test was used to assess the effect of test type (α=.05), and the Wilcoxon test was used to identify group-to-group differences (α=.017). RESULTS The absence of space between the framework and the abutments and interferences during its placement, as well as good stability, were observed clinically. In laboratory analysis, greater framework misfits were observed in the printed group compared with the conventional group when the single screw test was applied. Comparing the 3 tests used, the greatest misfits were observed when the framework was screwed onto the printed cast. CONCLUSIONS The innovative device tested for the intraoral scanning of multiple implants had clinically acceptable accuracy for the construction of passive and adapted frameworks. The conventional cast was more accurate than the printed cast, with lower misfit values, in all tests.
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Affiliation(s)
- Ana Larisse Carneiro Pereira
- Postgraduate student, Department of Dentistry, Federal University of Rio Grande do Norte (UFRN), Lagoa Nova, Natal, RN, Brazil
| | - Jéssica Marcela de Luna Gomes
- Postgraduate student, Department of Dental Materials and Prosthodontics, São Paulo State University (UNESP), Vila Mendonça, Araçatuba, SP, Brazil
| | | | | | | | - Eduardo Piza Pellizzer
- Professor, Department of Dental Materials and Prosthodontics, São Paulo State University (UNESP), Vila Mendonça, Araçatuba, SP, Brazil
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Zhang YJ, Qian SJ, Lai HC, Shi JY. Accuracy of photogrammetric imaging versus conventional impressions for complete arch implant-supported fixed dental prostheses: A comparative clinical study. J Prosthet Dent 2023; 130:212-218. [PMID: 34776266 DOI: 10.1016/j.prosdent.2021.09.035] [Citation(s) in RCA: 11] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Revised: 09/29/2021] [Accepted: 09/29/2021] [Indexed: 11/18/2022]
Abstract
STATEMENT OF PROBLEM Clinical studies on the accuracy of the photogrammetric imaging technique for complete arch implant-supported fixed dental prostheses are lacking. PURPOSE The purpose of this clinical study was to evaluate the accuracy (trueness) of photogrammetric imaging for complete arch implant-supported prostheses by comparing photogrammetric imaging with verified conventional splinted impressions. MATERIAL AND METHODS Completely edentulous arches with at least 4 implants were included. Both photogrammetric imaging and conventional splinted impressions were performed in each jaw. The conventional casts were verified and scanned by using a laboratory scanner as the control. The distances and angulations between different implants (interimplant distances and interimplant angulations) were measured in all photogrammetric and conventional standard tessellation language (STL) files by using a reverse-engineering software program. The distance deviations between the photogrammetric and conventional impressions of the same participant were calculated as the primary outcome, and the angular deviations were obtained as the secondary outcome with descriptive analyses. The comparison between distance deviations and the clinically acceptable level of deviations (150 μm) was conducted by using the 1-sample t test. The effect of interimplant distances, interimplant angulations, and jaw (maxilla or mandible) on deviations was analyzed by using the Spearman correlation analysis, Kruskal-Wallis test, or Student t test, depending on the type of data (α=0.05 for all tests). RESULTS Fourteen edentulous jaws were included. The overall distance deviation of photogrammetric imaging was 70 ±57 μm, significantly lower than the clinically acceptable level of misfit (150 μm; P<.001). The overall angular deviation was 0.432 ±0.348 degrees. The distance deviations were correlated with interimplant distances with a correlation coefficient (r) of 0.371 (P=.002). Interimplant angulation was not correlated with distance or angular deviations (P=.914, P=.914). Jaw was not correlated with distance or angular deviations either (P=.190, P=.209). CONCLUSIONS The accuracy (trueness) of photogrammetric imaging of complete arch implant-supported prostheses was within a clinically acceptable range of errors. Distance deviations increased with greater interimplant distances. Interimplant angulations and jaw (maxilla or mandible) had no significant effect on the accuracy of photogrammetric imaging.
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Affiliation(s)
- Yi-Jie Zhang
- Resident, Department of Implant Dentistry, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine; College of Stomatology, Shanghai Jiao Tong University; National Center for Stomatology; National Clinical Research Center for Oral Diseases; Shanghai Key Laboratory of Stomatology, Shanghai, PR China
| | - Shu-Jiao Qian
- Attending, Department of Implant Dentistry, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine; College of Stomatology, Shanghai Jiao Tong University; National Center for Stomatology; National Clinical Research Center for Oral Diseases; Shanghai Key Laboratory of Stomatology, Shanghai, PR China
| | - Hong-Chang Lai
- Professor, Department of Implant Dentistry, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine; College of Stomatology, Shanghai Jiao Tong University; National Center for Stomatology; National Clinical Research Center for Oral Diseases; Shanghai Key Laboratory of Stomatology, Shanghai, PR China
| | - Jun-Yu Shi
- Attending, Department of Implant Dentistry, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine; College of Stomatology, Shanghai Jiao Tong University; National Center for Stomatology; National Clinical Research Center for Oral Diseases; Shanghai Key Laboratory of Stomatology, Shanghai, PR China.
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11
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Comparison of the Accuracy of Two Transfer Caps in Positional Transmission of Palatal Temporary Anchorage Devices: An In Vitro Study. Dent J (Basel) 2023; 11:dj11020051. [PMID: 36826196 PMCID: PMC9954813 DOI: 10.3390/dj11020051] [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: 12/15/2022] [Revised: 02/07/2023] [Accepted: 02/10/2023] [Indexed: 02/16/2023] Open
Abstract
The aim of this study was to compare the positional information transfer accuracy of palatal temporary anchorage devices (TADs) of two different brands of transfer caps: PSM and Leone. Thirty plaster casts of maxillary dental arches were chosen for master models. A couple of Leone TADs were inserted in each master model. For each master model, two analysis models were created: using two transfer caps, Leone and PSM, the impressions were taken, the analogues were connected on the transfer caps, and the casts were poured. Using digital methods and equipment, such as a 3D scanner, a 3D analysis and a comparison of the accuracy of the two transfer caps in transferring the positional information of the TADs was then made. The data obtained were analyzed using the Mann-Whitney U-test at a significance level of α = 0.05. PSM transfer caps showed higher error frequency in almost all measurements. Only two measurements had a larger error in the analysis models made with Leone transfer caps. The Mann-Whitney U-test found a significant difference between the error levels of TADs found in the analysis models created with PSM transfer caps. Leone transfer caps showed greater reliability in TADs positional information transmission.
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12
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Ochoa-López G, Cascos R, Antonaya-Martín JL, Revilla-León M, Gómez-Polo M. Influence of ambient light conditions on the accuracy and scanning time of seven intraoral scanners in complete-arch implant scans. J Dent 2022; 121:104138. [DOI: 10.1016/j.jdent.2022.104138] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 03/24/2022] [Accepted: 04/20/2022] [Indexed: 10/18/2022] Open
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Accuracy of Digital Dental Implants Impression Taking with Intraoral Scanners Compared with Conventional Impression Techniques: A Systematic Review of In Vitro Studies. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:ijerph19042026. [PMID: 35206217 PMCID: PMC8872312 DOI: 10.3390/ijerph19042026] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 02/04/2022] [Accepted: 02/07/2022] [Indexed: 12/20/2022]
Abstract
The aim of this systematic review was to evaluate the in vitro accuracy of dental implants impressions taken with intraoral scanner compared with impressions taken with conventional techniques. Two independent reviewers conducted a systematic electronic search in the PubMed, Web of Science and Scopus databases. Some of the employed key terms, combined with the help of Boolean operators, were: "dental implants", "impression accuracy", "digital impression" and "conventional impression". Publication dates ranged from the earliest article available until 31 July 2021. A total of 26 articles fulfilled the inclusion criteria: 14 studies simulated complete edentation (CE), nine partial edentation (PE) and only two simulated a single implant (SI); One study simulated both CE and SI. In cases of PE and SI, most of the studies analyzed found greater accuracy with conventional impression (CI), although digital impression (DI) was also considered adequate. For CE the findings were inconclusive as six studies found greater accuracy with DI, five found better accuracy with CI and four found no differences. According to the results of this systematic review, DI is a valid alternative to CI for implants in PE and SI, although CI appear to be more accurate. For CE the findings were inconclusive, so more studies are needed before DI can be recommended for all implant-supported restorations.
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Parthasarathi K, Clark JR, Leinkram D, Cheng K, Hogen-Esch R, Howes D. Expanding the digital workflow for a prefabricated prelaminated fibula flap: A dental technique. J Prosthet Dent 2022:S0022-3913(21)00562-X. [DOI: 10.1016/j.prosdent.2021.10.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Revised: 10/01/2021] [Accepted: 10/04/2021] [Indexed: 10/19/2022]
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Ma B, Yue X, Sun Y, Peng L, Geng W. Accuracy of photogrammetry, intraoral scanning, and conventional impression techniques for complete-arch implant rehabilitation: an in vitro comparative study. BMC Oral Health 2021; 21:636. [PMID: 34893053 PMCID: PMC8665494 DOI: 10.1186/s12903-021-02005-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Accepted: 12/01/2021] [Indexed: 12/05/2022] Open
Abstract
Background To compare the accuracy of photogrammetry, intraoral scanning and conventional impression techniques for complete-arch implant rehabilitation. Methods A master cast containing 6 implant abutment replicas was fabricated. Group PG: digital impressions were taken 10 times using a photogrammetry system; Group IOS: intraoral scanning was performed to fabricate 10 digital impressions; Group CNV: splinted open-tray impression technique was used to fabricate 10 definitive casts. The master cast and conventional definitive casts were digitized with a laboratory reference scanner. For all STL files obtained, scan bodies were converted to implant abutment replicas using a digital library. The accuracy of a digitizer was defined by 2 main parameters, trueness and precision. "Trueness" was used to describe the deviation between test files and reference file, and "precision" was used to describe the closeness between test files. Then, the trueness and precision of three impression techniques were evaluated and statistically compared (α = 0.05). Results The median trueness was 24.45, 43.45 and 28.70 μm for group PG, IOS and CNV; Group PG gave more accurate trueness than group IOS (P < 0.001) and group CNV (P = 0.033), group CNV showed more accurate trueness than group IOS (P = 0.033). The median precision was 2.00, 36.00 and 29.40 μm for group PG, IOS and CNV; Group PG gave more accurate precision than group IOS (P < 0.001) and group CNV (P < 0.001), group CNV showed more accurate precision than IOS (P = 0.002). Conclusions For complete-arch implant rehabilitation, the photogrammetry system showed the best accuracy of all the impression techniques evaluated, followed by the conventional impression technique, and the intraoral scanner provided the least accuracy.
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Affiliation(s)
- Bowen Ma
- Department of Dental Implant Center, Beijing Stomatological Hospital, School of Stomatology, Capital Medical University, No. 4 Tian Tan Xi Li, Dongcheng District, Beijing, 100050, People's Republic of China
| | - Xinxin Yue
- Department of Dental Implant Center, Beijing Stomatological Hospital, School of Stomatology, Capital Medical University, No. 4 Tian Tan Xi Li, Dongcheng District, Beijing, 100050, People's Republic of China
| | - Yujie Sun
- Department of Dental Implant Center, Beijing Stomatological Hospital, School of Stomatology, Capital Medical University, No. 4 Tian Tan Xi Li, Dongcheng District, Beijing, 100050, People's Republic of China
| | - Lingyan Peng
- Department of Prosthodontics, Beijing Citident Stomatology Hospital, No. 109 North Xidan Street, Xicheng District, Beijing, 100032, People's Republic of China
| | - Wei Geng
- Department of Dental Implant Center, Beijing Stomatological Hospital, School of Stomatology, Capital Medical University, No. 4 Tian Tan Xi Li, Dongcheng District, Beijing, 100050, People's Republic of China.
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16
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Huang R, Liu Y, Huang B, Zhou F, Chen Z, Li Z. Improved accuracy of digital implant impressions with newly designed scan bodies: an in vivo evaluation in beagle dogs. BMC Oral Health 2021; 21:623. [PMID: 34876122 PMCID: PMC8650335 DOI: 10.1186/s12903-021-01986-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Accepted: 11/24/2021] [Indexed: 11/26/2022] Open
Abstract
Background The accuracy of digital impressions for fully edentulous cases is currently insufficient for routinely clinical application. To overcome the challenge, a modified scan body was introduced, which demonstrated satisfactory accuracy in vitro. The aim of this study was to evaluate the accuracy of digital impressions using the modified scan bodies with extensional structure versus scan bodies without extensional structure in mandible with two implants in beagle dogs. Methods The unilateral mandibular second premolar to second molar were extracted in four beagle dogs. Twelve weeks later, two implants were placed. Five repeated digital impressions were performed with an intraoral scanner on each dog using each of the two different scan bodies: Group I—scan body without extensional structure (SB); Group II—scan body with extensional structure (SBE). The scans were exported to Standard Tessellation Language (STL) files to serve as test data. The dogs were sacrificed and the dissected mandibles were digitalized with a lab scanner to provide reference data. Linear and angular deviations were calculated in an inspection software for accuracy assessment. Statistical analysis was performed with two-way ANOVA. The level of significance was set at α = 0.05. Results For trueness assessment, the mean of absolute linear/angular deviations were 119.53 μm/0.75 degrees in Group I and 68.89 μm/0.36 degrees in Group II. SBE was more accurate than SB regarding both linear (p = 0.008) and angular (p = 0.049) deviations. For precision assessment, the mean of absolute linear/angular deviations were 63.01 μm/0.47 degrees in Group I and 38.38 μm/0.24 degrees in Group II. No significant difference was found. Conclusions The application of SBE significantly improved the trueness of digital impressions in mandible with two implants compared to SB. No significant difference was found in terms of precision.
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Affiliation(s)
- Ruoxuan Huang
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Stomatology, No. 56, Lingyuan west road, Guangzhou, 510060, China
| | - Yuanxiang Liu
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Stomatology, No. 56, Lingyuan west road, Guangzhou, 510060, China
| | - Baoxin Huang
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Stomatology, No. 56, Lingyuan west road, Guangzhou, 510060, China
| | | | - Zhuofan Chen
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Stomatology, No. 56, Lingyuan west road, Guangzhou, 510060, China.
| | - Zhipeng Li
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Stomatology, No. 56, Lingyuan west road, Guangzhou, 510060, China.
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Accuracy of Proximal and Occlusal Contacts of Single Implant Crowns Fabricated Using Different Digital Scan Methods: An In Vitro Study. MATERIALS 2021; 14:ma14112843. [PMID: 34073329 PMCID: PMC8197899 DOI: 10.3390/ma14112843] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Revised: 05/24/2021] [Accepted: 05/25/2021] [Indexed: 11/17/2022]
Abstract
The purpose of this in vitro study was to compare the accuracy of the proximal and occlusal contacts of single implant crowns fabricated with four data capture methods. The resin models were mounted on an articulator, digitized using a laboratory scanner, and saved as a standard tessellation language (STL) file to serve as the master reference model (MRM). Two different intraoral scan body (ISB) systems were evaluated: polyetheretherketone (PEEK) short scan body (SSB) and PEEK long scan body (LSB) (n = 12). The digital impressions (SSB and LSB) were acquired using an intraoral scanner with ISB. Two different conventional techniques were also evaluated: PEEK short scan body with coping plastic cap (CPC) and pick-up coping (PUC) (n = 12). The implant impressions (CPC and PUC) were recorded using a conventional impression technique. The crown and abutment were fabricated with a milling machine and then placed on the resin model and scanned using a laboratory scanner. The scanned files were saved as STL files to serve as test datasets. The MRM and test datasets were superimposed, and the mesial, distal, and occlusal distances were calculated using a 3D inspection software and statistically analyzed using the Kruskal–Wallis H test (α = 0.05). The direct data capture group had more accurate contact points on the three surfaces, with mesial contact of 64.7 (12.8) µm followed by distal contact of 65.4 (15) µm and occlusal contact of 147 (35.8) µm in the SSB group, and mesial contact of 84.9 (22.6) µm followed by distal contact of 69.5 (19.2) µm and occlusal contact of 115.9 (27.7) µm in the LSB group (p < 0.001). The direct data capture groups are closer to the ideal proximal and occlusal contacts for single implant crowns than the indirect data capture groups. There was no difference in the accuracy between the two types of scan body (SSB and LSB).
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Park CJ, Son JJ, Lin R, Phark JH, Wilson ML, Chee WW, Cho G. Evaluation of fracture resistance of zirconia modification/polishing around implant abutments. J ORAL IMPLANTOL 2021; 48:202-209. [PMID: 33945621 DOI: 10.1563/aaid-joi-d-20-00144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Subcrestal placement of implants may have interproximal bone proximity issues that interfere with submucosal contour of the implant-supported Zirconia restorations during delivery of these restorations. Modification of the mesial distal submucosal areas may be necessary to fully seat the restoration without impingement of the interproximal bone. Our aim was to determine if modification of submucosal cervical contour of implant supported zirconia titanium base (Zi-Ti base) restorations result in a significant change in fracture strength compared to Zi-Ti base restorations without any modification near the cervical submucosal area. Implant Zi-Ti base restorations, designed in the form of a maxillary premolar was made for the Straumann implant lab analog. Zirconia samples were cemented onto the Ti-base and the test group (N=20) underwent recontouring and polishing at the junction of the Zi-Ti-base cervical areas. The control group (N=20) did not undergo any modifications. All 40 samples underwent fracture testing with an Instron machine. We assessed differences between modified and unmodified implant restorations using a two-tailed t-test for independent samples. Fracture strength values (N) ranged from 4,354.68 to 6,412.49 in the test group (N=20) and from 5,400.31 to 6,953.22 in the control group (N=20). The average fracture strength in the control group (6,154.84 ± 320.50) was higher than in the modified group (5,593.13 ± 486.51; p<.001)). Modification of submucosal contour significantly decreased the fracture strength. However, the average fracture strength exceeded the masticatory forces of humans.
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Affiliation(s)
- Cheryl Jonghee Park
- Herman Ostrow School of Dentistry of University of Southern California Dentistry 925 W. 34th Street Rm4374 UNITED STATES Los Angeles CA 90089 12139991716 Assistant Professor of Clinical Dentistry, Carl Rieder Professor of Restorative Dentistry, Division of Restorative Sciences, Herman Ostrow School of Dentistry, University of Southern California, Los Angeles, California, USA
| | - Jenny Jin Son
- Assistant Professor of Clinical Dentistry, Division of Restorative Sciences, Herman Ostrow School of Dentistry, University of Southern California, Los Angeles, California, USA
| | - Richard Lin
- Assistant Professor of Clinical Dentistry, Director of CAD/CAM Dentistry, Division of Restorative Sciences, Herman Ostrow School of Dentistry, University of Southern California, Los Angeles, California, USA
| | - Jin-Ho Phark
- Associate Professor of Clinical Dentistry, Director of Biomaterials Research Laboratory, Co-Director of Advanced Program in Operative and Adhesive Dentistry, Division of Restorative Sciences, Herman Ostrow School of Dentistry, University of Southern Califo
| | - Melissa Lee Wilson
- Associate Professor of Clinical Preventive Medicine, University of Southern California KECK School of Medicine, Los Angeles, California, USA
| | - Winston W Chee
- Associate Professor, Ralph & Jean Bleak Professor of Restorative Dentistry, Director of Advanced Education in Prosthodontics, Director of Implant Dentistry, Herman Ostrow School of Dentistry of University of Southern California, Los Angeles, California, US
| | - George Cho
- Associate Professor, Phillip Maurer Tennis Professor of Clinical Dentistry, Assistant Director of Advanced Prosthodontics, Director of Predoctoral Implant Dentistry, Herman Ostrow School of Dentistry, University of Southern California, Los Angeles, Califor
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Sallorenzo A, Gómez-Polo M. Comparative study of the accuracy of an implant intraoral scanner and that of a conventional intraoral scanner for complete-arch fixed dental prostheses. J Prosthet Dent 2021; 128:1009-1016. [PMID: 33836855 DOI: 10.1016/j.prosdent.2021.01.032] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2020] [Revised: 01/21/2021] [Accepted: 01/21/2021] [Indexed: 11/25/2022]
Abstract
STATEMENT OF PROBLEM Most of the available digital systems are designed to image teeth and soft tissue rather than dental implants. However, although some are marketed specifically to record implant position, whether these products are better for implant scanning is unclear. PURPOSE The purpose of this in vitro study was to compare the accuracy of an implant intraoral scanner (PiC camera) with that of an intraoral scanner (TRIOS3) for 6 implants placed in completely edentulous arches. MATERIAL AND METHODS Two maxillary master models with 6 external hexagonal Ø5.1-mm implants were used, one with parallel and the other with angled implants. The reference values were obtained with a coordinate measuring machine. Ten scans were made per model (parallel and angled) and system (intraoral and implant) (n=10), after which the 3-dimensional coordinates for each implant were determined with a computer-aided design software program and compared with the linear and angular reference values. Statistical significance was determined with the Student t test (α=.05). RESULTS Statistically significant differences (P<.001) were found in both precision and trueness. The overall errors relative to the reference in the parallel implant-supported casts based on the implant scanner were 20 μm (P=.031) and 0.354 degrees (P=.087) compared with 100 μm (P<.001) and 1.177 degrees (P<.001) in the cast based on conventional digital scans. The global errors in the angled implant casts were 10 μm (P=.055) and 0.084 degrees (P=.045) for the implant digital scans and 23 μm (P=.179) and 0.529 degrees (P<.001) for the conventional digital scans. CONCLUSIONS The implant intraoral scanner delivered greater precision and trueness than the conventional instrument for imaging complete-arch implant-supported prostheses.
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Affiliation(s)
- Alessandro Sallorenzo
- Postgraduate Specialist in Advanced-Prosthodontics, Department of Conservative Dentistry and Prosthodontics, School of Dentistry, Complutense University of Madrid, Madrid, Spain.
| | - Miguel Gómez-Polo
- Associate Professor, Department of Conservative Dentistry and Prosthodontics, School of Dentistry, Complutense University of Madrid, Madrid, Spain; Head of Postgraduate Specialist Programme in Advanced Implant-Prosthodontics, Complutense University of Madrid, Madrid, Spain
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Lyu M, Di P, Lin Y, Jiang X. Accuracy of impressions for multiple implants: A comparative study of digital and conventional techniques. J Prosthet Dent 2021; 128:1017-1023. [PMID: 33640093 DOI: 10.1016/j.prosdent.2021.01.016] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Revised: 01/06/2021] [Accepted: 01/07/2021] [Indexed: 11/26/2022]
Abstract
STATEMENT OF PROBLEM Intraoral scanning has benefits over conventional impression making, but whether scanning is sufficiently accurate for multiple implants is unclear. PURPOSE The purpose of this in vitro study was to compare the trueness of digital scans acquired by using intraoral scanners from a small range to a complete arch with the conventional impression technique and to determine the influence of 2 different evaluation methods (best-fit algorithm versus absolute linear deviation) on the outcomes of accuracy assessment. MATERIAL AND METHODS A mandibular model with 8 implants (A-H) around an edentulous arch was used as the master model. Open-format standard tessellation language (STL) data sets (1 reference file from a highly accurate dental laboratory scanner, 10 files from an intraoral scanner, and 10 files from digitized conventional impressions at room temperature) were imported to a metrology software program, and 5 groups of scanning ranges (AB, FGH, CDEF, BCDEFG, and ABCDEFGH) were identified simulating different clinical situations. Two evaluation methods-root mean square values calculated from the best-fit algorithm and average value of linear discrepancies from absolute linear deviation-were used to describe the trueness values. The impacts of different scanning or impression methods, ranges, and evaluation methods were tested by using a 3-way ANOVA. The effect of the scanning range on accuracy was further identified with 1-way ANOVA. The paired-sample t test was used to determine the differences of trueness values between the 2 methods in different groups. RESULTS The trueness values of the implant impressions were significantly affected by different scanning or impression methods (P<.001), evaluation methods (P<.001), and scanning ranges (P<.001) as independent variables. With use of the best-fit algorithm, deviations from the digital scans were significantly greater than those from the conventional impressions in cross-arch situations (groups CDEF, BCDEFG, and ABCDEFGH). With use of the absolute linear deviation method, statistically significant lower accuracy was found when larger areas were encountered (groups BCDEFG and ABCDEFGH). Use of the absolute linear deviation method resulted in a higher mean score of inaccuracy than that from the best-fit algorithm method in most situations. CONCLUSIONS Scanning or impression methods, ranges, and evaluation methods affected the dimensional accuracy (trueness) of scans or impressions with multiple implants. Digital scans had worse trueness values compared with those made with the conventional splinting open-tray technique when cross-arch implant impressions were acquired.
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Affiliation(s)
- Mingyue Lyu
- Resident Doctor, Department of Oral Implantology, Peking University School and Hospital of Stomatology, Beijing, PR China
| | - Ping Di
- Professor and Chairman, Department of Oral Implantology, Peking University School and Hospital of Stomatology, Beijing, PR China
| | - Ye Lin
- Professor, Department of Oral Implantology, Peking University School and Hospital of Stomatology, Beijing, PR China
| | - Xi Jiang
- Associated Doctor in Chief, Department of Oral Implantology, Peking University School and Hospital of Stomatology, Beijing, PR China.
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Knechtle N, Wiedemeier D, Mehl A, Ender A. Accuracy of digital complete-arch, multi-implant scans made in the edentulous jaw with gingival movement simulation: An in vitro study. J Prosthet Dent 2021; 128:468-478. [DOI: 10.1016/j.prosdent.2020.12.037] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Revised: 12/20/2020] [Accepted: 12/21/2020] [Indexed: 10/22/2022]
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Digital scanning for complete-arch implant-supported restorations: A systematic review. J Prosthet Dent 2020; 124:161-167. [DOI: 10.1016/j.prosdent.2019.06.014] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Revised: 06/21/2019] [Accepted: 06/21/2019] [Indexed: 11/21/2022]
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Cabello-Domínguez G, Pérez-López J, Veiga-López B, González D, Revilla-León M. Maxillary zirconia and mandibular composite resin-lithium disilicate-modified PEEK fixed implant-supported restorations for a completely edentulous patient with an atrophic maxilla and mandible: A clinical report. J Prosthet Dent 2019; 124:403-410. [PMID: 31870613 DOI: 10.1016/j.prosdent.2019.10.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Revised: 10/02/2019] [Accepted: 10/02/2019] [Indexed: 10/25/2022]
Abstract
Bimaxillary implant-supported restorations for edentulous patients must include a comprehensive diagnosis, treatment plan, and careful selection of the restorative materials. The present clinical report described a completely edentulous patient rehabilitated with a zirconia framework with a facial ceramic veneer on the maxillary arch and a modified polyetheretherketone (PEEK) framework with gingival composite resin and cemented lithium disilicate crowns on the mandibular arch. The rationale for this combination of restorative materials is reviewed.
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Affiliation(s)
| | | | | | | | - Marta Revilla-León
- Assistant Professor and Assistant Program Director AEGD, College of Dentistry, Texas A&M University, Dallas, Texas; Affiliate Assistant Professor Graduate Prosthodontics, University of Washington, Seattle, Wash; Researcher, Revilla Research Center, Madrid, Spain.
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Iturrate M, Lizundia E, Amezua X, Solaberrieta E. A new method to measure the accuracy of intraoral scanners along the complete dental arch: A pilot study. J Adv Prosthodont 2019; 11:331-340. [PMID: 31897272 PMCID: PMC6933048 DOI: 10.4047/jap.2019.11.6.331] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2019] [Revised: 10/08/2019] [Accepted: 12/12/2019] [Indexed: 11/08/2022] Open
Abstract
PURPOSE The purpose of this study is to assess the accuracy of three intraoral scanners along the complete dental arch and evaluate the feasibility of the assessment methodology for further in vivo analysis. MATERIALS AND METHODS A specific measurement pattern was fabricated and measured using a coordinate measuring machine for the assessment of control distances and angles. Afterwards, the pattern was placed and fixed in replica of an upper jaw for their subsequent scans (10 times) using 3 intraoral scanners, namely iTero Element1, Trios 3, and True Definition. 4 reference distances and 5 angles were measured and compared with the controls. Trueness and precision were assessed for each IOS: trueness, as the deviation of the measures from the control ones, while precision, as the dispersion of measurements in each reference parameter. These measurements were carried out using software for analyzing 3-dimensional data. Data analysis software was used for statistical and measurements analysis (α=.05). RESULTS Significant differences (P<.05) were found depending on the intraoral scanner used. Best trueness values were achieved with iTero Element1 (mean from 10 ± 7 µm to 91 ± 63 µm) while the worst values were obtained with Trios3 (mean from 42 ± 23 µm to 174 ± 77 µm). Trueness analysis in angle measurements, as well as precision analysis, did not show conclusive results. CONCLUSION iTero Element1 was more accurate than the current versions of Trios3 and True Definition. Importantly, the proposed methodology is considered reliable for analyzing accuracy in any dental arch length and valid for assessing both trueness and precision in an in vivo study.
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Affiliation(s)
- Mikel Iturrate
- Department of Business Management, Gipuzkoa Faculty of Engineering, University of the Basque Country UPV/EHU; Donostia - San Sebastián, Spain
| | - Erlantz Lizundia
- Department of Graphic Design and Engineering Projects, Bilbao Faculty of Engineering, University of the Basque Country UPV/EHU; Bilbao, Spain.,BCMaterials, Basque Center for Materials, Applications and Nanostructures, UPV/EHU; Leioa, Spain
| | - Xabier Amezua
- Department of Graphic Design and Engineering Projects, Gipuzkoa Faculty of Engineering, University of the Basque Country UPV/EHU; Donostia - San Sebastián, Spain
| | - Eneko Solaberrieta
- Department of Graphic Design and Engineering Projects, Gipuzkoa Faculty of Engineering, University of the Basque Country UPV/EHU; Donostia - San Sebastián, Spain
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Mori G, Iwai K, Oda Y, Furuya Y, Yajima Y. Full-Arch Implant-Supported Fixed Dental Prosthesis Retained by a Combination of Galvano-Telescopic Copings and Screws: A Clinical Report. J Prosthodont 2019; 28:947-950. [PMID: 31642562 DOI: 10.1111/jopr.13117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/07/2019] [Indexed: 11/28/2022] Open
Abstract
Full-arch screw-retained implant-supported fixed dental prostheses have a high long-term success rate and are considered the gold standard by many clinicians. However, accurate fabrication of a passive fit long-span prosthesis can be challenging. A novel intraoral adhesion method using galvano-telescopic copings was proposed as a way of improving prosthetic fit for edentulous patients. This report describes the treatment of a 74-year-old female with a full-arch implant-supported dental prosthesis, supported by a combination of galvano-telescopic copings and screws to prevent retention loss. Four years have passed since this superstructure was placed, during this time she exhibited a good clinical course with no inflammation noted in surrounding tissues. Treatment with an implant-supported fixed dental prosthesis, retained by a combination of galvano-telescopic copings and screws, can be a useful alternative treatment for edentulous patients.
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Affiliation(s)
- Gentaro Mori
- Department of Oral and Maxillofacial Implantology, Tokyo Dental College, Tokyo, Japan
| | - Kazuya Iwai
- Department of Oral and Maxillofacial Implantology, Tokyo Dental College, Tokyo, Japan
| | - Yukari Oda
- Department of Oral and Maxillofacial Implantology, Tokyo Dental College, Tokyo, Japan
| | - Yoshitaka Furuya
- Department of Oral and Maxillofacial Implantology, Tokyo Dental College, Tokyo, Japan
| | - Yasutomo Yajima
- Department of Oral and Maxillofacial Implantology, Tokyo Dental College, Tokyo, Japan
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Arcuri L, Pozzi A, Lio F, Rompen E, Zechner W, Nardi A. Influence of implant scanbody material, position and operator on the accuracy of digital impression for complete-arch: A randomized in vitro trial. J Prosthodont Res 2019; 64:128-136. [PMID: 31255546 DOI: 10.1016/j.jpor.2019.06.001] [Citation(s) in RCA: 70] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2019] [Revised: 05/30/2019] [Accepted: 06/03/2019] [Indexed: 11/24/2022]
Abstract
PURPOSE To evaluate the influence of implant scanbody (ISB) material, position and operator on the accuracy of a confocal microscopy intraoral scanning (IOS) for complete-arch implant impression. METHODS An edentulous maxillary model with 6 internal hexagonal connection analogues was scanned with an extraoral optical scanner to achieve a reference file. Three ISBs made of different materials (polyetheretherketone (Pk), titanium (T) and Pk with a titanium base (Pkt)) were scanned with IOS by 3 operators. The resulting 45 test files were aligned to the reference file with a best fit algorithm. Linear (ΔX, ΔY and ΔZ-axis) and angular deviations (ΔANGLE) were assessed. Absolute values of the linear discrepancies were summed up to obtain a global measure of linear absolute error (ΔASS). Influence of ISB material, position and operator was statistically assessed using the mixed general linear model. RESULTS At multivariate analysis, whenΔASS was considered as response variable, it was identified a significant influence of material (p<0.0001) and position (p=0.0009) while no significant operator effect was detected. When ΔANGLE was considered as response variable, material and position significantly influenced the expected ΔANGLE (p=0.0232 and p<0.0001) and no operator effect was identified. CONCLUSIONS The investigated IOS for complete-arch digital impression was influenced by the ISB material with peek reporting the best results on both linear and angular measurements followed by titanium, peek-titanium resulting as the less accurate. Implant angulation affected significantly the linear deviations while implant position the angular deviations. Operator did not show any significant effect on the IOS accuracy.
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Affiliation(s)
| | - Alessandro Pozzi
- Adjunct Associate Professor, Dental college of Georgia, Augusta University, USA. Private practice, Rome, Italy.
| | | | - Eric Rompen
- Department of Periodontology and Oral Surgery, University of Liège, Belgium
| | - Werner Zechner
- Bernhard Gottlieb University Clinic of Dentistry, Medical University of Vienna, Austria
| | - Alessandra Nardi
- Department of Mathematics, University of Rome Tor Vergata, Italy
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Jiang X, Lin Y, Cui HY, Di P. Immediate loading of multiple splinted implants via complete digital workflow: A pilot clinical study with 1-year follow-up. Clin Implant Dent Relat Res 2019; 21:446-453. [PMID: 31025525 DOI: 10.1111/cid.12781] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
BACKGROUND Complete digital workflow attracts more attention in implant dentistry. OBJECTIVES To explore the feasibility and short-term clinical results of immediate loading of multiple implants with fixed temporary bridges (2-4 teeth span) by complete digital workflow, and to evaluate the three-dimensional (3D) deviation of digital impression comparing with traditional impression method. MATERIAL AND METHODS A total of 31 partial edentulous patients (16 females and 15 males) were recruited in this study. Digital impressions were taken immediately after implant placement, and implant-supported splinted temporary bridges were fabricated through a full digital approach (model free) and delivered within 24 hours. Final restorations were finished 4 months after surgery via traditional impression technique. Subjects were followed 1 year after treatment. 3D impression deviations were analyzed by comparing the digital and conventional impression methods. Time costs for the full digital approach were recorded. Implant survival rate, marginal bone levels were evaluated. RESULTS All the recruited subjects finished this study. Seventy-four implants were surgically placed and immediately loaded with 34 temporary bridges fabricated through a full digital approach. Digital impression deviation compared with traditional impression method was 27.43 ± 13.47 μm. Time costs for chair side and laboratory were 32.55 ± 4.73 and 69.30 ± 10.87 minutes, respectively. Marginal bone alterations were -1.58 mm and -1.69 mm at the time of 4 and 12 months after surgery. The implants had a survival rate of 100% at the 1-year follow-up time. CONCLUSIONS Immediate loading of multiple implants in partial edentulous (2-4 teeth span) patients with full digital approach is clinically applicable. The 3D discrepancy between digital and traditional impression is within clinical acceptable range.
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Affiliation(s)
- Xi Jiang
- Department of Oral Implantology, Peking University School and Hospital of Stomatology, Beijing, People's Republic of China
| | - Ye Lin
- Department of Oral Implantology, Peking University School and Hospital of Stomatology, Beijing, People's Republic of China
| | - Hong Y Cui
- Department of Oral Implantology, Peking University School and Hospital of Stomatology, Beijing, People's Republic of China
| | - Ping Di
- Department of Oral Implantology, Peking University School and Hospital of Stomatology, Beijing, People's Republic of China
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Mori G, Oda Y, Sakamoto K, Ito T, Yajima Y. Clinical evaluation of full-arch screw-retained implant-supported fixed prostheses and full-arch telescopic-retained implant-supported fixed prostheses: A 5-12 year follow-up retrospective study. Clin Oral Implants Res 2019; 30:197-205. [PMID: 30667092 DOI: 10.1111/clr.13406] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2018] [Revised: 01/16/2019] [Accepted: 01/16/2019] [Indexed: 11/29/2022]
Abstract
OBJECTIVE To assess the prostheses and implants survival rate and peri-implantitis rate in edentulous patients treated with full-arch screw-retained implant-supported fixed dental prostheses (FSIFDPs) and full-arch telescopic-retained implant-supported fixed dental prostheses (FTIFDPs) over an observation period of at least 5 years. MATERIALS AND METHODS From 2004 to 2012, 696 implants were inserted into 78 patients with 102 prostheses. The FSIFDP group comprised 31 patients (37 prostheses, 232 implants), whereas the FTIFDP group comprised 47 patients (65 prostheses, 464 implants). Prosthesis and implant estimated cumulative survival rates (ECSR) and estimated cumulative peri-implantitis rates (ECPR) were assessed. The follow-up period was 5-12 years. Kaplan-Meier survival curves with the log-rank test were used to evaluate outcomes. RESULTS The 12-year prosthesis ECSR was 96.8% (95% CI: 79.2-99.5, 36/37 prostheses) in the FSIFDP group and 96.4% (95% CI: 86.3-99.1, 63/65 prostheses) in the FTIFDP group, whereas the 12-year implant ECSR was 99.5% (95% CI: 96.4-99.9, 231/232 implants) in the FSIFDP group and 98.7% (95% CI: 96.9-99.5, 459/464 implants) in the FTIFDP group. The 12-year ECPR at the prosthesis level was 12.8% (95% CI: 12.7-47.6, 4/37 prostheses) in the FSIFDP group and 12.8% (95% CI: 11.4-24.1, 6/65 prostheses) in the FTIFDP group. The 12-year ECPR at the implant level was 4.4% (95% CI: 4.3-23.0, 6/232 implants) in the FSIFDP group and 2.2% (95% CI: 2.0-12.3, 7/464 implants) in the FTIFDP group. CONCLUSION FTIFDPs have clinical results comparable to those of FSIFDPs. Therefore, FTIFDPs can be useful.
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Affiliation(s)
- Gentaro Mori
- Department of Oral and Maxillofacial Implantology, Tokyo Dental College, Tokyo, Japan
| | - Yukari Oda
- Department of Oral and Maxillofacial Implantology, Tokyo Dental College, Tokyo, Japan
| | - Kei Sakamoto
- Department of Oral and Maxillofacial Implantology, Tokyo Dental College, Tokyo, Japan
| | - Taichi Ito
- Department of Oral and Maxillofacial Implantology, Tokyo Dental College, Tokyo, Japan
| | - Yasutomo Yajima
- Department of Oral and Maxillofacial Implantology, Tokyo Dental College, Tokyo, Japan
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Accuracy of 4 digital scanning systems on prepared teeth digitally isolated from a complete dental arch. J Prosthet Dent 2018; 121:811-820. [PMID: 30598308 DOI: 10.1016/j.prosdent.2018.08.020] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2018] [Revised: 08/27/2018] [Accepted: 08/28/2018] [Indexed: 11/24/2022]
Abstract
STATEMENT OF PROBLEM The accuracy of digital scanners is acceptable for scanning a complete dental arch. However, whether that accuracy is sufficient for only 1 tooth within the dental scan of a complete dental arch is unclear. PURPOSE The purpose of this in vitro study was to evaluate and compare the accuracy of 4 intraoral scanners on a complete dental arch and on prepared teeth digitally isolated from the digital scan in terms of trueness and precision. MATERIAL AND METHODS A model of a complete dental arch with tooth preparations was scanned 40 times with each of the 4 digital scanners. Their accuracy was evaluated by using 3-dimensional (3D) software to compare the test models with a highly accurate reference model. The data were digitally processed to isolate the prepared teeth and evaluate them in the same way. The data were statistically analyzed using the Levene test and the Tamhane's T2 test (α=.05). RESULTS In scans of a complete dental arch, the True Definition scanner had the best accuracy values, followed by TRIOS, iTero, and Omnicam. For prepared teeth isolated from the dental arch, both True Definition and TRIOS had the best values, followed by iTero and Omnicam. CONCLUSIONS In both long-span scans of the complete dental arch and isolated prepared teeth, the True Definition scanner had the greatest accuracy, closely followed by TRIOS.
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Mizumoto RM, Yilmaz B. Intraoral scan bodies in implant dentistry: A systematic review. J Prosthet Dent 2018; 120:343-352. [DOI: 10.1016/j.prosdent.2017.10.029] [Citation(s) in RCA: 123] [Impact Index Per Article: 20.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2017] [Revised: 10/27/2017] [Accepted: 10/27/2017] [Indexed: 10/17/2022]
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Ghodsi S, Pirmoazen S, Beyabanaki E, Rostami M, Alikhasi M. The Effect of Milling Metal Versus Milling Wax on Implant Framework Retention and Adaptation. J Prosthodont 2018; 28:e739-e743. [PMID: 29855135 DOI: 10.1111/jopr.12914] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/16/2018] [Indexed: 11/27/2022] Open
Abstract
PURPOSE The metal framework of implant-supported restorations can be made using different methods. For a successful outcome, the acceptability of each method depends on the retention and fit of the restoration. The aim of this study was to evaluate and compare the retention and adaptation of copings fabricated using two methods: casting wax patterns made by computer-aided design/computer-aided manufacturing (CAD/CAM) technology, and milling sintered chromium-cobalt (Cr-Co) blocks. MATERIALS AND METHODS Twenty-four abutment analogs (height, 5.5 mm) were divided into two groups according to the framework fabrication method. In one group, wax patterns were prepared using a CAM milling machine, and they were cast with a Ni-Cr-Ti metal alloy. In the second group, the copings were milled from Cr-Co blocks using a CAD/CAM milling machine. All copings were equal in contour, thickness, and internal relief and were seated on the abutment analogs after the necessary adjustments. The vertical marginal discrepancy was investigated using a silicone replica method and stereomicroscope with 75× magnification. After copings were cemented onto the abutment analogs using zinc phosphate, a tensile resistance test was performed using a universal testing machine. Mann-Whitney U and Student's t-test were used for statistical analyses at a significance level of 0.05. RESULTS An independent sample t-test revealed a significant difference between the two groups for retention (p = 0.010), and the milled wax group showed higher tensile resistance compared with the milled metal group. There was also a significant difference between the two groups in marginal discrepancy (p < 0.001), with a larger marginal gap in the milled metal group compared with the milled wax group. The milled metal copings required more adjustments to fit on the abutment analogs compared with the wax milled copings (p < 0.001). CONCLUSIONS The CAD/CAM technique for wax milling resulted in more retentive copings with better marginal and internal adaptations compared with milling the metal blocks.
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Affiliation(s)
- Safura Ghodsi
- Department of Prosthodontics, Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran
| | - Salma Pirmoazen
- Department of Endodontics, Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran
| | - Elaheh Beyabanaki
- Department of Prosthodontics, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mitra Rostami
- Department of Prosthodontics, Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran
| | - Marzieh Alikhasi
- Department of Prosthodontics, Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran
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Belur D, Nagy WW. An alternative digital workflow for fabricating a mandibular implant-supported complete fixed dental prosthesis with limited restorative space: A clinical report. J Prosthet Dent 2018; 120:1-4. [PMID: 29580562 DOI: 10.1016/j.prosdent.2017.11.023] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2017] [Revised: 11/18/2017] [Accepted: 11/20/2017] [Indexed: 11/28/2022]
Abstract
This clinical report describes the prosthetic rehabilitation of a patient with a mandibular implant-supported complete fixed dental prosthesis with limited interocclusal restorative space. The problem was manifested by repeated fractures of the acrylic resin teeth and distortion of the supporting framework. The definitive restoration included a custom computer-aided design and computer-aided manufacturing (CAD-CAM) titanium framework with the lingual cusps and most of the occlusal table of the mandibular posterior teeth milled in titanium as part of the framework. An esthetic CAD-CAM milled denture base along with teeth was bonded over this framework.
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Affiliation(s)
- Druthil Belur
- Resident, Graduate Prosthodontics, Department of Restorative Dentistry, Texas A&M University College of Dentistry, Dallas, Texas.
| | - William W Nagy
- Professor, Department of Restorative Dentistry, Texas A&M University College of Dentistry, Dallas, Texas
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AL-Meraikhi H, Yilmaz B, McGlumphy E, Brantley WA, Johnston WM. Distortion of CAD-CAM-fabricated implant-fixed titanium and zirconia complete dental prosthesis frameworks. J Prosthet Dent 2018; 119:116-123. [DOI: 10.1016/j.prosdent.2017.02.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2016] [Revised: 02/05/2017] [Accepted: 02/06/2017] [Indexed: 10/19/2022]
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de Sá BCM, Andrighetto AR, Bernardes SR, Tiossi R. Fracture Strength of Standard and Small Diameter Prosthetic Abutments for Full-Arch Implant-Supported Restorations. J ORAL IMPLANTOL 2017; 43:175-179. [PMID: 28318375 DOI: 10.1563/aaid-joi-d-16-00108] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
This study tested the fracture strength of prosthetic abutments with different sizes and combinations to support a 5-implant milled framework with distal extension. Prosthetic abutments with different dimensions (4.8-mm diameter mini conical abutment and 3.5-mm diameter microconical abutment) were screwed to 5 threaded implants. The following groups were divided (n = 3): G1 with 5 miniconical abutments (standard size), G2 with 5 microconical abutments (small sized), G3 with a combination of 3 small sized abutments and 2 standard sized abutments, and G4 with a combination of 2 small sized abutments and 3 standard sized abutments. Standardized titanium frameworks for full-arch fixed dental prosthesis were milled with equidistant holes for each of the 5 implants and abutments. A loading point was selected at 18 mm away from both distal implants. A universal testing system was used for the fracture strength tests and load was applied at a crosshead speed of 0.5 mm/min on the previously described loading points until component fracture. Mean fracture strength for each group was statistically compared (α = 0.05). Prosthetic screws were the only fractured components for all tested groups. Mean fracture strength was: G1, 1130.22 N; G2, 1031.36 N; G3, 757.9 N; and G4 792.03 N (P < .05). All prosthetic abutments and combinations that were tested provide adequate fracture strength for clinical use. However, the combination of standard and small diameter abutments leads to lower fracture strength compared with when only standard sized prosthetic abutments were used, irrespective of the abutment diameter (4.8- or 3.5-mm).
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Affiliation(s)
| | | | | | - Rodrigo Tiossi
- 2 Department of Restorative Dentistry, State University of Londrina (UEL), Londrina, Brazil
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Vandeweghe S, Vervack V, Dierens M, De Bruyn H. Accuracy of digital impressions of multiple dental implants: anin vitrostudy. Clin Oral Implants Res 2016; 28:648-653. [DOI: 10.1111/clr.12853] [Citation(s) in RCA: 96] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/20/2016] [Indexed: 10/21/2022]
Affiliation(s)
- Stefan Vandeweghe
- Department of Periodontology, Oral Implantology, Removable and Implant Prosthetics; Dental School; Faculty of Medicine and Health Sciences; Ghent University; Ghent Belgium
| | - Valentin Vervack
- Department of Periodontology, Oral Implantology, Removable and Implant Prosthetics; Dental School; Faculty of Medicine and Health Sciences; Ghent University; Ghent Belgium
| | - Melissa Dierens
- Oral and Maxillofacial Imaging Unit; Dental School; University Hospital Ghent; Ghent Belgium
| | - Hugo De Bruyn
- Department of Periodontology, Oral Implantology, Removable and Implant Prosthetics; Dental School; Faculty of Medicine and Health Sciences; Ghent University; Ghent Belgium
- Department of Prosthodontics; Malmö University; Malmö Sweden
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Bhering CLB, Marques IDSV, Takahashi JMFK, Barão VAR, Consani RLX, Mesquita MF. The effect of casting and masticatory simulation on strain and misfit of implant-supported metal frameworks. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 62:746-51. [DOI: 10.1016/j.msec.2016.02.035] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2015] [Revised: 08/06/2015] [Accepted: 02/11/2016] [Indexed: 11/16/2022]
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Peñarrocha-Oltra D, Agustín-Panadero R, Pradíes G, Gomar-Vercher S, Peñarrocha-Diago M. Maxillary Full-Arch Immediately Loaded Implant-Supported Fixed Prosthesis Designed and Produced by Photogrammetry and Digital Printing: A Clinical Report. J Prosthodont 2015; 26:75-81. [DOI: 10.1111/jopr.12364] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/25/2015] [Indexed: 11/28/2022] Open
Affiliation(s)
- David Peñarrocha-Oltra
- Department of Oral Surgery and Implant Dentistry; Valencia University Medical and Dental School; Valencia Spain
| | - Rubén Agustín-Panadero
- Department of Stomatology; Valencia University Medical and Dental School; Valencia Spain
| | - Guillermo Pradíes
- Department of Buccofacial Prostheses; Complutense University Dental School; Madrid Spain
| | | | - Miguel Peñarrocha-Diago
- Department of Oral Surgery and Implant Dentistry; Valencia University Medical and Dental School; Valencia Spain
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Beyabanaki E, Shamshiri AR, Alikhasi M, Monzavi A. Effect of Splinting on Dimensional Accuracy of Impressions Made of Implants with Different Subgingival Alignments. J Prosthodont 2015; 26:48-55. [PMID: 26436559 DOI: 10.1111/jopr.12368] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/25/2015] [Indexed: 11/26/2022] Open
Abstract
PURPOSE Placement of implants at deeper levels of gingiva is sometimes inevitable because of issues like esthetics or bone availability. The accuracy of impressions may be affected in these situations. The aim of this in vitro study was to evaluate the effects of splinting and length of impression copings on the accuracy of impressions made of deeply placed implants. MATERIALS AND METHODS A metal model with two parallel implants (Implantium; Dentium) was fabricated. One hundred and twenty impressions were made using the direct impression technique with and without splinting the impression copings (using short and long impression copings). Impressions were made of implants at three subgingival levels (1, 3, and 6 mm) using regular viscosity poly(vinyl siloxane). The impressions were poured with type IV dental stone. Displacements in the x, y, and z axes, as well as rotational discrepancies and interimplant distances were measured with a coordinate measuring machine. Data were analyzed with Kruskal-Wallis, Mann-Whitney, and nonparametric adjusted rank transform tests. RESULTS There was less rotational displacement using longer impression copings at different subgingival positions of the implants, either with splinted or nonsplinted direct technique (p < 0.05). Also, the nonsplinted technique produced more accurate impressions at different apico-coronal levels of implants than the splinted technique using short impression copings (p < 0.05). CONCLUSIONS According to the findings of this study, longer impression copings yielded better results than shorter ones in both splinted and nonsplinted techniques. Also, nonsplinted short impression copings produced more accurate impressions than splinted short impression copings.
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Affiliation(s)
- Elaheh Beyabanaki
- Department of Prosthodontics, Faculty of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran
- Dental Research Centre, Dentistry Research Institute and Department of Prosthodontics, Faculty of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
| | - Ahmed Reza Shamshiri
- Department of Prosthodontics, Faculty of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Marzieh Alikhasi
- Department of Prosthodontics, Faculty of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran
- Dental Research Centre, Dentistry Research Institute and Department of Prosthodontics, Faculty of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
| | - Abbas Monzavi
- Dental Research Centre, Dentistry Research Institute and Department of Prosthodontics, Faculty of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
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Screw joint stability after the application of retorque in implant-supported dentures under simulated masticatory conditions. J Prosthet Dent 2014; 111:499-504. [DOI: 10.1016/j.prosdent.2013.07.024] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2012] [Revised: 07/17/2013] [Accepted: 07/31/2013] [Indexed: 11/20/2022]
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40
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Using stereophotogrammetric technology for obtaining intraoral digital impressions of implants. J Am Dent Assoc 2014; 145:338-44. [DOI: 10.14219/jada.2013.45] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Noh K, Choi WJ, Pae A. Implant-supported fixed restoration of post-traumatic mandibular defect accompanied with skin grafting: A clinical report. J Adv Prosthodont 2013; 5:67-72. [PMID: 23508120 PMCID: PMC3597928 DOI: 10.4047/jap.2013.5.1.67] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2012] [Revised: 12/06/2012] [Accepted: 12/12/2012] [Indexed: 11/25/2022] Open
Abstract
Traumatic defects are mostly accompanied by hard and soft tissue loss. This report describes the surgical and prosthetic treatment of a patient with post-traumatic mandibular defect. A split-thickness skin graft was performed prior to implant placement and prefabricated acrylic stent was placed to hold the graft in place. The esthetic and functional demands of the patient were fulfilled by implant-supported screw-retained fixed prosthesis using CAD-CAM technology.
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Affiliation(s)
- Kwantae Noh
- Department of Prosthodontics, School of Dentistry, Kyung Hee University, Seoul, Republic of Korea
| | - Woo-Jin Choi
- Department of Prosthodontics, School of Dentistry, Kyung Hee University, Seoul, Republic of Korea
| | - Ahran Pae
- Department of Prosthodontics, School of Dentistry, Kyung Hee University, Seoul, Republic of Korea
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Deslis A, Hasan I, Bourauel C, Bayer S, Stark H, Keilig L. Numerical investigations of the loading behaviour of a prefabricated non-rigid bar system. Ann Anat 2012; 194:538-44. [PMID: 22664278 DOI: 10.1016/j.aanat.2012.04.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2012] [Revised: 04/16/2012] [Accepted: 04/18/2012] [Indexed: 11/17/2022]
Abstract
The aim of this study has been to systematically evaluate the loading behaviour of a novel pre-fabricated chair-side SFI-Bar(®) bar system supported by two implants using finite element (FE) analysis. Two series of FE models were created of the bar placed on two idealised implants and embedded in idealised bone segments using CAD data. In the first series, the inter-implant distance varied from 10 to 26mm; the second series consisted of a bar with a fixed implant distance of 26mm and varying horizontal fitting inaccuracy from 0.0 to 0.3mm. The bar was loaded vertically at 500 N. In all simulations, the regions with the greatest amount of stress were concentrated on the connecting elements of the bar and the bar itself. A slight increase in stress was observed with decreasing inter-implant distance. With a non-zero fitting inaccuracy, no clear correlation was observed between the amount of play and the stress distribution in the system. For a perfect fit, an obvious increase in stress was found in the implant and strain in the implant bed. With respect to the excessive static loading performed in our simulations and the resulting loading behaviour, we conclude that the SFI-Bar is a system suitable for clinical application.
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Affiliation(s)
- A Deslis
- Endowed Chair of Oral Technology, Rheinische Friedrich-Wilhelms University, Welschnonnenstr. 17, 53111 Bonn, Germany
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Maló P, de Araújo Nobre M, Borges J, Almeida R. Retrievable Metal Ceramic Implant-Supported Fixed Prostheses with Milled Titanium Frameworks and All-Ceramic Crowns: Retrospective Clinical Study with up to 10 Years of Follow-Up. J Prosthodont 2012; 21:256-64. [DOI: 10.1111/j.1532-849x.2011.00824.x] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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Lee SJ, Cho SB. Accuracy of five implant impression technique: effect of splinting materials and methods. J Adv Prosthodont 2011; 3:177-85. [PMID: 22259700 PMCID: PMC3259442 DOI: 10.4047/jap.2011.3.4.177] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2011] [Revised: 05/24/2011] [Accepted: 11/21/2011] [Indexed: 11/18/2022] Open
Abstract
PURPOSE The aim of this study was to evaluate the effect of dimensional stability of splinting material on the accuracy of master casts. MATERIALS AND METHODS A stainless steel metal model with 6 implants embedded was used as a master model. Implant level impressions were made after square impression copings were splinted using 5 different techniques as follows. (1) Splinted with autopolymerizing resin and sectioned, reconnected to compensate polymerization shrinkage before the impression procedure. (2) Splinted with autopolymerizing resin just before impression procedure. (3) Primary impression made with impression plaster and secondary impression were made over with polyether impression material. (4) Splinted with impression plaster. (5) Splinted with VPS bite registration material. From master model, 5 impressions and 5 experimental casts, total 25 casts were made for each of 5 splinting methods. The distortion values of each splinting methods were measured using coordinate measuring machine, capable of recordings in the x-, y-, z-axes. A one-way analysis of variance (ANOVA) at a confidence level of 95% was used to evaluate the data and Tukey's studentized range test was used to determine significant differences between the groups. RESULTS Group 1 showed best accuracy followed by Group 3 & 4. Group 2 and 5 showed relatively larger distortion value than other groups. No significant difference was found between group 3, 4, 5 in x-axis, group 2, 3, 4 in y-axis and group 1, 3, 4, 5 in z-axis (P<.0001). CONCLUSION Both Splinting impression copings with autopolymerizing resin following compensation of polymerization shrinkage and splinting method with impression plaster can enhance the accuracy of master cast and impression plaster can be used simple and effective splinting material for implant impression procedure.
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Jemt T, Hjalmarsson L. In Vitro Measurements of Precision of Fit of Implant-Supported Frameworks. A Comparison between “Virtual” and “Physical” Assessments of Fit Using Two Different Techniques of Measurements. Clin Implant Dent Relat Res 2011; 14 Suppl 1:e175-82. [DOI: 10.1111/j.1708-8208.2011.00416.x] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Alikhasi M, Siadat H, Monzavi A, Momen-Heravi F. Three-Dimensional Accuracy of Implant and Abutment Level Impression Techniques: Effect on Marginal Discrepancy. J ORAL IMPLANTOL 2011; 37:649-57. [DOI: 10.1563/aaid-joi-d-09-00112.1] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Impression techniques should precisely represent the 3-dimensional status of implants to allow for the fabrication of passively fitting prostheses and subsequently the elimination of strain on supporting implant components and surrounding bone. The aim of this study was to compare the accuracy of an abutment level impression method with that of an implant level (direct and indirect) impression method using polyether impression material to obtain precise definitive casts and prostheses. A reference acrylic resin dentoform with 2 internal connection implants (Implantium) was made. A total of 21 medium-consistency polyether impressions of the dentoform, including 7 direct implant level, 7 indirect implant level, and 7 abutment level (after 2 straight abutments were secured), were made. Impressions were poured with American Dental Association (ADA) type IV stone, and the positional accuracy of the implant replica heads and abutment analogs in each dimension of x-, y-, and z-axes, as well as angular displacement (Δθ), was evaluated using a coordinate measuring machine. Noble alloy 3-unit castings were fabricated and seated on the abutments in 3 groups; marginal discrepancies were measured at 4 points between prostheses and abutments. Data were analyzed using Mann-Whitney U test, 1-way analysis of variance (ANOVA), and Kruskal-Wallis tests. In comparisons of different impression techniques, only significant statistical Δθ differences were noted between the abutment level method and other techniques (P < .001). Results of this study reveal that although the implant level impression method could better transfer the angular position of the implants (Δθ), the impression method could not affect Δy, Δx, and Δz coordinates of the implants or marginal discrepancy of the 3-unit fixed partial dentures (FPD).
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Affiliation(s)
- Marzieh Alikhasi
- Assistant Professor, Department of Prosthodontics and Implant, Dental Research Center, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
| | - Hakimeh Siadat
- Associate Professor, Department of Prosthodontics and Implant, Dental Research Center, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
| | - Abbas Monzavi
- Associate Professor and Dean of Faculty, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
| | - Fatemeh Momen-Heravi
- Research Fellow, Dental Research Center, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
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Bhakta S, Vere J, Calder I, Patel R. Impressions in implant dentistry. Br Dent J 2011; 211:361-7. [PMID: 22015512 DOI: 10.1038/sj.bdj.2011.862] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/24/2011] [Indexed: 11/09/2022]
Abstract
UNLABELLED Accurate impressions provide a foundation for successful implant prosthodontics. This paper is aimed at the general dental practitioner (GDP) who would like to start restoring dental implants and demystifies the terminology, introduces the basic armamentarium and discusses the relative merits of different implant impression techniques. Detailed, step-by-step instructions for making impressions using the closed and open tray techniques are provided and the importance of verification jigs are highlighted. CLINICAL RELEVANCE A successful restoration is dependent upon proper planning and meticulous clinical processes. An understanding of impression techniques is therefore fundamental for the GDP wishing to restore implant-supported prostheses. OBJECTIVES The reader should be familiar with different implant components and understand the impression techniques used in implant dentistry.
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Affiliation(s)
- S Bhakta
- Charles Clifford Dental Hospital, Wellesley Road, Sheffield, S10 2SZ.
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Comparative Strain Gauge Analysis of External and Internal Hexagon, Morse Taper, and Influence of Straight and Offset Implant Configuration. IMPLANT DENT 2011; 20:e24-32. [DOI: 10.1097/id.0b013e318211fce8] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Nishioka RS, Nishioka LNBDM, Abreu CW, de Vasconcellos LGO, Balducci I. Machined and plastic copings in three-element prostheses with different types of implant-abutment joints: a strain gauge comparative analysis. J Appl Oral Sci 2010; 18:225-30. [PMID: 20856998 PMCID: PMC5349059 DOI: 10.1590/s1678-77572010000300005] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2008] [Accepted: 03/02/2010] [Indexed: 11/29/2022] Open
Abstract
Objective Using strain gauge (SG) analysis, the aim of this in vitro study
was quantify the strain development during the fixation of three-unit screw
implant-supported fixed partial dentures, varying the types of implant-abutment
joints and the type of prosthetic coping. The hypotheses were that the type of
hexagonal connection would generate different microstrains and the type of copings
would produce similar microstrains after prosthetic screws had been tightened onto
microunit abutments. Materials and methods Three dental implants with external (EH) and internal (IH) hexagonal
configurations were inserted into two polyurethane blocks. Microunit abutments
were screwed onto their respective implant groups, applying a torque of 20 Ncm.
Machined Co-Cr copings (M) and plastic prosthetic copings (P) were screwed onto
the abutments, which received standard wax patterns. The wax patterns were cast in
Co-Cr alloy (n=5), forming four groups: G1) EH/M; G2) EH/P; G3) IH/M and G4) IH/P.
Four SGs were bonded onto the surface of the block tangentially to the implants,
SG 1 mesially to implant 1, SG 2 and SG 3 mesially and distally to implant 2,
respectively, and SG 4 distally to implant 3. The superstructure’s occlusal screws
were tightened onto microunit abutments with 10 Ncm torque using a manual torque
driver. The magnitude of microstrain on each SG was recorded in units of
microstrain (µε). The data were analyzed statistically by ANOVA and Tukey’s
test (p<0.05). Results Microstrain values of each group were: G1= 338.1±223.0 µε; G2=
363.9±190.9 µε; G3= 415.1±53.5 µε; G4=
363.9±190.9 µε. No statistically significant difference was found
between EH and IH, regardless of the type of copings (p>0.05). The hypotheses
were partially accepted. Conclusions It was concluded that the type of hexagonal connection and coping presented
similar mechanical behavior under tightening conditions.
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Affiliation(s)
- Renato Sussumu Nishioka
- Department of Dental Materials and Prosthodontics, São José dos Campos Dental School, São Paulo State University, São José dos Campos, SP, Brazil.
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Hjalmarsson L, Örtorp A, Smedberg JI, Jemt T. Precision of Fit to Implants: A Comparison of Cresco™ and Procera® Implant Bridge Frameworks. Clin Implant Dent Relat Res 2010; 12:271-80. [DOI: 10.1111/j.1708-8208.2009.00171.x] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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