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Rajput S, Gandhewar M, Raul S, Bhalerao A, Baisane P, Gandhi A. Evaluation of Vertical Discrepancies in Crown Seating Using Different Glass Ionomer Cement Volume: An In Vitro Study. Cureus 2024; 16:e59928. [PMID: 38854350 PMCID: PMC11162275 DOI: 10.7759/cureus.59928] [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: 04/15/2024] [Accepted: 05/06/2024] [Indexed: 06/11/2024] Open
Abstract
Background This in vitro study aimed to assess the vertical disparities in the positioning of complete crown castings when different quantities of cement were used and to determine the optimal amount of cement for cementation while minimizing any marginal discrepancies. Methodology A total of 60 ideal nickel-chromium (Ni-Cr) crown castings were divided into three groups of experimental volumes of glass ionomer cement, with 20 castings in each group. Group I had completely filled volume with cement, group II had it half-filled, and group III had brushed up cement internally. The crowns were cemented by applying a static load of 5 kg to the cementation apparatus for 10 minutes. The marginal discrepancy between the die and the castings was measured pre-cementation and post-cementation using image analysis software in combination with a stereomicroscope (Motic, USA) at predetermined points that were marked on the die. Statistical analysis was performed using Statistical Package for the Social Sciences (IBM SPSS Statistics for Windows, IBM Corp., Version 16, Armonk, USA) software. A one-way analysis of variance (ANOVA) was used for the intergroup analysis. A paired sample t-test was used for intragroup analysis. Result Brushing cement onto the internal surface presented the least mean values (P<0.05) of post-pre-cementation vertical discrepancy (14.92±10.77 μm) when compared to the half-filled cement group (28.42±12.45 μm) and the fully-filled cement group (58.50±20.91 μm). Conclusion Cement volume appeared to be a key factor in the vertical marginal discrepancy of the crown. The cement brush applied to the internal surfaces of the crown showed smaller post-cementation vertical discrepancies.
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Affiliation(s)
- Sandip Rajput
- Department of Prosthodontics, Guru Gobind Singh College of Dental Sciences and Research Centre, Burhanpur, IND
| | - Mahesh Gandhewar
- Department of Prosthodontics, Annasaheb Chudaman Patil Memorial (ACPM) Dental College, Dhule, IND
| | - Sneha Raul
- Department of Prosthodontics, Guru Gobind Singh College of Dental Sciences and Research Centre, Burhanpur, IND
| | - Amruta Bhalerao
- Department of Prosthodontics, Annasaheb Chudaman Patil Memorial (ACPM) Dental College, Dhule, IND
| | - Priyadarshani Baisane
- Department of Prosthodontics, Annasaheb Chudaman Patil Memorial (ACPM) Dental College, Dhule, IND
| | - Akshay Gandhi
- Dentistry, Gandhi's Dental and Implant Clinic, Baramati, IND
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Alhamoudi FH. Comparing the accuracy of crown fitting between milling and 3D printing techniques using CAD/CAM technologies. Technol Health Care 2024; 32:2755-2768. [PMID: 38820032 DOI: 10.3233/thc-231961] [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] [Indexed: 06/02/2024]
Abstract
BACKGROUND The accuracy of dental crowns is crucial for their longevity and effectiveness. OBJECTIVE This study aims to investigate how the precision of crowns is affected by two different fabrication methods, either subtractive (milling) or additive (3D printing), within computer-aided design/computer-aided manufacture (CAD/CAM) technology. METHODS A standardised digital scan of a maxillary first molar with a shoulder margin (.stl file) was used to design and fabricate crowns through both subtractive (milling) and additive (3D printing) processes. The crowns' marginal and internal fits were assessed comprehensively. Statistical analysis, including two-way ANOVA and independent t-tests, revealed significant differences in fitting accuracy between the two methods. RESULTS Crowns produced via 3D printing demonstrated superior fitting with minimal marginal (14 ± 5 μm) and internal discrepancies (22 ± 5 μm) compared to milling (marginal: 22 ± 4 μm, internal: 23 ± 3 μm), indicating a statistically significant advantage in precision (ps⩽ 0.022 for marginal fit). CONCLUSION The findings suggest that 3D printing may offer a more accurate alternative to milling in the fabrication of digital dental prostheses, potentially revolutionising the field with its enhanced precision capabilities.
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Bae EB, Cho WT, Park DH, Hwang SH, Lee SH, Yun MJ, Jeong CM, Huh JB. Comparison of fit and trueness of zirconia crowns fabricated by different combinations of open CAD-CAM systems. J Adv Prosthodont 2023; 15:155-170. [PMID: 37441720 PMCID: PMC10333096 DOI: 10.4047/jap.2023.15.3.155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 05/26/2023] [Accepted: 06/20/2023] [Indexed: 07/15/2023] Open
Abstract
PURPOSE This study aims to clinically compare the fitness and trueness of zirconia crowns fabricated by different combinations of open CAD-CAM systems. MATERIALS AND METHODS Total of 40 patients were enrolled in this study, and 9 different zirconia crowns were prepared per patient. Each crown was made through the cross-application of 3 different design software (EZIS VR, 3Shape Dental System, Exocad) with 3 different processing devices (Aegis HM, Trione Z, Motion 2). The marginal gap, absolute marginal discrepancy, internal gap(axial, line angle, occlusal) by a silicone replica technique were measured to compare the fit of the crown. The scanned inner and outer surfaces of the crowns were compared to CAD data using 3D metrology software to evaluate trueness. RESULTS There were significant differences in the marginal gap, absolute marginal discrepancy, axial and line angle internal gap among the groups (P < .05) in the comparison of fit. There was no statistically significant difference among the groups in terms of occlusal internal gap. The trueness ranged from 36.19 to 43.78 µm but there was no statistically significant difference within the groups (P > .05). CONCLUSION All 9 groups showed clinically acceptable level of marginal gaps ranging from 74.26 to 112.20 µm in terms of fit comparison. In the comparison of trueness, no significant difference within each group was spotted. Within the limitation of this study, open CAD-CAM systems used in this study can be assembled properly to fabricate zirconia crown.
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Affiliation(s)
- Eun-Bin Bae
- Department of Prosthodontics, Dental Research Institute, Dental and Life Sciences Institute, Education and Research Team for Life Science on Dentistry, School of Dentistry, Pusan National University, Yangsan, Republic of Korea
- The Shapiro Family Laboratory of Viral Oncology and Aging Research & Section of Restorative Dentistry, UCLA School of Dentistry, Los Angeles, CA, USA
| | - Won-Tak Cho
- Department of Prosthodontics, Dental Research Institute, Dental and Life Sciences Institute, Education and Research Team for Life Science on Dentistry, School of Dentistry, Pusan National University, Yangsan, Republic of Korea
| | - Do-Hyun Park
- Department of Prosthodontics, Dental Research Institute, Dental and Life Sciences Institute, Education and Research Team for Life Science on Dentistry, School of Dentistry, Pusan National University, Yangsan, Republic of Korea
| | - Su-Hyun Hwang
- Department of Prosthodontics, Dental Research Institute, Dental and Life Sciences Institute, Education and Research Team for Life Science on Dentistry, School of Dentistry, Pusan National University, Yangsan, Republic of Korea
| | - So-Hyoun Lee
- Department of Prosthodontics, Dental Research Institute, Dental and Life Sciences Institute, Education and Research Team for Life Science on Dentistry, School of Dentistry, Pusan National University, Yangsan, Republic of Korea
| | - Mi-Jung Yun
- Department of Prosthodontics, Dental Research Institute, Dental and Life Sciences Institute, Education and Research Team for Life Science on Dentistry, School of Dentistry, Pusan National University, Yangsan, Republic of Korea
| | - Chang-Mo Jeong
- Department of Prosthodontics, Dental Research Institute, Dental and Life Sciences Institute, Education and Research Team for Life Science on Dentistry, School of Dentistry, Pusan National University, Yangsan, Republic of Korea
| | - Jung-Bo Huh
- Department of Prosthodontics, Dental Research Institute, Dental and Life Sciences Institute, Education and Research Team for Life Science on Dentistry, School of Dentistry, Pusan National University, Yangsan, Republic of Korea
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Shin H, Kang YJ, Kim H, Kim JH. Effect of cement space settings on the marginal and internal fit of 3D-printed definitive resin crowns. J Prosthet Dent 2023:S0022-3913(23)00187-7. [PMID: 37202234 DOI: 10.1016/j.prosdent.2023.03.021] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Revised: 03/20/2023] [Accepted: 03/22/2023] [Indexed: 05/20/2023]
Abstract
STATEMENT OF PROBLEM The cement gap setting affects the marginal and internal fits depending on the crown material and manufacturing method (subtractive or additive manufacturing). However, information on the effects of cement space settings in the computer-aided design (CAD) software program, which is used to aid the manufacturing with 3-dimensional (3D) printing-type resin material, is lacking, and recommendations for optimal marginal and internal fit are needed. PURPOSE The purpose of this in vitro study was to evaluate how cement gap settings affect the marginal and internal fit of a 3D-printed definitive resin crown. MATERIAL AND METHODS After scanning a prepared typodont left maxillary first molar, a crown was designed with cement spaces of 35, 50, 70, and 100 μm by using a CAD software program. A total of 14 specimens per group were 3D printed from definitive 3D-printing resin. By using the replica technique, the intaglio surface of the crown was duplicated, and the duplicated specimen was sectioned in the buccolingual and mesiodistal directions. Statistical analyses were performed using the Kruskal-Wallis and the Mann-Whitney post hoc tests (α=.05). RESULTS Although the median values of the marginal gaps were within the clinically acceptable limit (<120 μm) for all the groups, the smallest marginal gaps were obtained with the 70-μm setting. For the axial gaps, there was no observed difference in the 35-, 50-, and 70-μm groups, and the 100-μm group showed the largest gap. The smallest axio-occlusal and occlusal gaps were obtained with the 70-μm setting. CONCLUSIONS Based on the findings of this in vitro study, a 70-μm cement gap setting is recommended for optimal marginal and internal fit of 3D-printed resin crowns.
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Affiliation(s)
- Heedo Shin
- Graduate student, Department of Prosthodontics, Yonsei University College of Dentistry, Seoul, Republic of Korea
| | - You-Jung Kang
- Research Assistant Professor, Department of Prosthodontics, Oral Science Research Center, Yonsei University College of Dentistry, Seoul, Republic of Korea
| | - Hoon Kim
- Researcher, Research Institute of Agriculture and Life Sciences, College of Agriculture & Life Sciences, Seoul National University, Seoul, Republic of Korea
| | - Jee-Hwan Kim
- Professor, Department of Prosthodontics, Oral Science Research Center, Yonsei University College of Dentistry, Seoul, Republic of Korea.
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Lee HB, Bea EJ, Lee WS, Kim JH. Trueness of stereolithography ZrO 2 crowns with different build directions. Dent Mater J 2023; 42:42-48. [PMID: 36288942 DOI: 10.4012/dmj.2022-041] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
This study aims to measure the trueness of zirconia crowns with different build directions of materials fabricated using the stereolithography (SLA) method. The anatomic contour crown of prepped maxillary right first molar was designed using CAD software to obtain the standard tessellation language (STL) file. Two different build directions were set for the crowns using Materialize Magics software. One group was built with a margin base platform, while the other group was built in the direction opposite to the occlusal surface base platform. The 20 crown-shaped parts were printed. The STL files of scanned printing zirconia crowns were superimposed each segment by the 3D analysis software. The two groups were statistically analyzed using t-tests. Significant differences were found in the marginal and internal discrepancies between the groups. The build direction had a significant influence on the accuracy of the zirconia crown. The results indicate the most effective build direction for manufacturing SLA 3D-printed crowns.
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Affiliation(s)
- Ha-Bin Lee
- Transdisciplinary Major in Learning Health Systems, Department of Healthcare Sciences, Graduate School, Korea University
| | | | - Wan-Sun Lee
- Department Of Dental Technology, Bucheon University
| | - Ji-Hwan Kim
- Transdisciplinary Major in Learning Health Systems, Department of Healthcare Sciences, Graduate School, Korea University
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Marginal and Internal Fit of Monolithic Zirconia Crowns Fabricated by Using Two Different CAD-CAM Workflows: An In Vitro Study. PROSTHESIS 2023. [DOI: 10.3390/prosthesis5010003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Objectives: Few studies have evaluated the marginal fit of computer-aided design—computer-aided manufacturing (CAD-CAM) monolithic zirconia crowns fabricated through completely digital workflow; however, the internal fit of these restorations is not well known. The purpose of this in vitro study was to evaluate the marginal and internal fit of monolithic zirconia crowns fabricated by using digital workflow, including intraoral scanner (IOS) scans, and compare the results to those of a semi-digital workflow, which combined conventional impressions, poured casts, and extraoral scanner (EOS) scanning. Materials and methods: A typodont right mandibular first molar was prepared for a complete-coverage ceramic crown and scanned using an IOS. The conventional impressions of the preparation were also made, and stone casts were poured and scanned by using an EOS. Virtual models were generated for both workflows, and identical virtual anatomic contour crowns were designed using CAD software. Monolithic zirconia crowns were fabricated for both IOS (ZI; n = 10) and EOS (ZE; n = 10) groups. The silicon replica technique was used to evaluate the marginal and internal fit of the crowns. Measurements were made at 13 points on buccolingual and mesiodistal cross-sections per specimen with a ×6.5 to ×50 zoom stereo microscope. The results from both groups were statistically compared using the Independent Samples t-tests and the Mann–Whitney U test (α = 0.05). Results: Mean gap values at all measurement locations for ZE were significantly higher than those for ZI (p ≤ 0.002). Overall mean values ranged between 29 and 43 µm (median: 28–42 µm) for ZI and 42 and 75 µm (median: 43–77 µm) for ZE. Conclusion: Completely digital workflow through intraoral scans provided significantly better marginal and internal fit for CAD-CAM monolithic zirconia crowns compared with the semi-digital workflow, where stone casts obtained from conventional impressions were scanned with an EOS. Yet, both workflows provided an acceptable marginal and internal fit for CAD-CAM monolithic zirconia molar crowns (<120 µm). Clinical Relevance: Completely digital workflow using IOS scans may be advantageous for the fabrication of CAD-CAM monolithic zirconia crowns as favorable results can be obtained with less material waste and potentially shortened overall treatment time as the impression files can be transferred to the production facility electronically. The results need to be corroborated with clinical studies.
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Ruggiero MM, Gomes RS, Bergamo ETP, Freitas MIM, Bonfante EA, Del Bel Cury AA. Marginal and Internal Misfit of Occlusal Veneers Made in Resin-matrix Ceramics. Oper Dent 2022; 47:701-708. [DOI: 10.2341/21-115-l] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/25/2022] [Indexed: 11/30/2022]
Abstract
SUMMARY
Objective
Considering that misfit is a significant predictor of the clinical success of indirect restorations, the objective of this study was to evaluate the marginal and internal misfit of two computer-aided design and manufacturing (CAD/CAM) RMC ceramic materials used as occlusal veneers (OVs) of different thicknesses.
Methods and Materials
A CAD model of a mandibular first molar was obtained and OV preparations 0.5-, 1.0-, and 1.5-mm thick were modeled and milled in two different materials (n=10/group): resin nanoceramic (RNC) and polymer-infiltrated ceramic network (PICN). Using the same CAD model, tooth preparations were milled in fiber-reinforced epoxy resin (n=20/thickness). The marginal and internal misfit of the restorations was assessed by X-ray microtomography. The measurements of the marginal gap (MG) and absolute marginal discrepancy were performed in two locations on each slice, whereas internal gap (IG) measurements were performed at ten locations on each slice. The data obtained were analyzed using two-way analysis of variance and Tukey post-hoc tests (α=0.05).
Results
No significant effect was attributable to the material type or material–thickness interaction for the MG, absolute marginal discrepancy (AMD), or IG (p>0.05). However, the thickness significantly affected the IG of the restorations (p<0.05). CAD/CAM RNC and PICN systems presented similar MG and AMD for OVs 0.5-, 1.0-, and 1.5-mm thick. However, the IG varied between thicknesses.
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Affiliation(s)
- MM Ruggiero
- Mirelle Maria Ruggiero, DDS, MSc, Department of Prosthodontics and Periodontology, University of Campinas -Piracicaba Dental School, Piracicaba, SP, Brazil
| | - RS Gomes
- Rafael Soares Gomes, DDS, MSc, PhD, Department of Prosthodontics and Periodontology, University of Campinas -Piracicaba Dental School, Piracicaba, SP, Brazil
| | - ETP Bergamo
- Edmara Tatiely Pedroso Bergamo, DDS, MSc, PhD, Department of Prosthodontics and Periodontology, University of São Paulo - Bauru School of Dentistry, Bauru, SP, Brazil
| | - MIM Freitas
- Mariana Itaborai Moreira Freitas, DDS, MSc, Department of Prosthodontics and Periodontology, University of Campinas -Piracicaba Dental School, Piracicaba, SP, Brazil
| | - EA Bonfante
- Estevam Augusto Bonfante, DDS, MSc, PhD, Department of Prosthodontics and Periodontology, University of São Paulo -Bauru School of Dentistry, Bauru, SP, Brazil
| | - AA Del Bel Cury
- *Altair Antoninha Del Bel Cury, DDS, MSc, PhD, Department of Prosthodontics and Periodontology, University of Campinas - Piracicaba Dental School, Piracicaba, SP, Brazil
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Tan YY, Ho TK, Goo CL. Effect of training on time efficiency and marginal adaptation of computer-aided design/computer-aided manufacturing crowns among dental students. EUROPEAN JOURNAL OF DENTAL EDUCATION : OFFICIAL JOURNAL OF THE ASSOCIATION FOR DENTAL EDUCATION IN EUROPE 2022; 26:468-474. [PMID: 34541757 DOI: 10.1111/eje.12722] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Revised: 06/14/2021] [Accepted: 07/10/2021] [Indexed: 06/13/2023]
Abstract
INTRODUCTION The computer-aided design/computer-aided manufacturing (CAD/CAM) technology has revolutionised dentistry at present. An operator's skills can affect the overall clinical duration and marginal accuracy of the prosthesis fabricated through this workflow. The aim of this study was to assess the effect of CAD/CAM hands-on training compared with that of a self-instructional video on the performance of dental students in digital impression and fabrication of a CAD/CAM crown. METHODS In this cross-sectional study, 30 undergraduate dental students were shown a CEREC demonstration video. Each operator then captured a digital impression using the intra-oral scanner, and a crown was subsequently milled. All participants underwent a training course before repeating the process. Marginal discrepancy for each crown on its abutment tooth was measured before and after training using a stereomicroscope and was evaluated using Wilcoxon signed rank test. The duration taken for the process was recorded before and after training and evaluated using paired t-test. RESULTS The overall mean ±standard deviation marginal adaptation for the CEREC crowns was 78.15 ± 42.83 μm before training and 52.41 ± 17.12 μm after training. The Wilcoxon signed rank test found significant difference (p < .05) in terms of marginal adaptation of crowns fabricated before and after training. Paired t-tests showed that the time efficiency after training significantly improved compared with that before training. CONCLUSIONS Training with guided feedback is crucial to improve the time efficiency of making a digital impression and marginal adaptation of fixed prosthesis using the CAD/CAM technology.
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Affiliation(s)
- Ying Yin Tan
- Department of Restorative Dentistry, Faculty of Dentistry, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, Kuala Lumpur, Malaysia
| | - Ting Khee Ho
- Department of Restorative Dentistry, Faculty of Dentistry, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, Kuala Lumpur, Malaysia
| | - Chui Ling Goo
- Department of Restorative Dentistry, Faculty of Dentistry, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, Kuala Lumpur, Malaysia
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Lüchtenborg J, Willems E, Zhang F, Wesemann C, Weiss F, Nold J, Sun J, Sandra F, Bai J, Reveron H, Chevalier J, Spies BC. Accuracy of additively manufactured zirconia four-unit fixed dental prostheses fabricated by stereolithography, digital light processing and material jetting compared with subtractive manufacturing. Dent Mater 2022; 38:1459-1469. [DOI: 10.1016/j.dental.2022.06.026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Revised: 06/08/2022] [Accepted: 06/22/2022] [Indexed: 11/27/2022]
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Merchant A, Maiti S, Ashok V, Ganapathy DM. Comparative analysis of different impression techniques in relation to single tooth impression. Bioinformation 2021; 16:1105-1110. [PMID: 34938011 PMCID: PMC8600204 DOI: 10.6026/973206300161105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Revised: 10/27/2020] [Accepted: 10/27/2020] [Indexed: 11/23/2022] Open
Abstract
It is of interest to compare the accuracy of three different impression techniques for a single tooth impression. We used 3 groups with 15 samples each in this study. Group 1: Putty and light body in a sectional stock tray; Group 2: Monophase and extra light
body in a sectional stock tray; Group 3: Matrix impression technique. 15 impressions were taken of a prepared tooth on a typodont with each technique. The dimensions of the casts poured from these impression techniques were compared with the control typodont
tooth. Data analysis shows that the matrix impression technique gave the best results in terms of dimensional study followed by monophase and extra light body impression technique and putty and light body impression technique gave the least accurate results. The
results show that there is a statistically significant difference between the three impression techniques in terms of dimensional stability. Data analysis shows that the matrix impression technique gave the best results in terms of dimensional study followed by
monophase and extra light body impression technique and putty and light body impression technique gave the least accurate results. The variations between the groups are within acceptable limits. Hence, it can be concluded that all the impression techniques will
result in adequate dimensional stability and can be used in clinical scenarios.
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Affiliation(s)
- Aman Merchant
- Saveetha Dental College, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai 77, India
| | - Subhabrata Maiti
- Saveetha Dental College, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai 77, India
| | - V Ashok
- Saveetha Dental College, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai 77, India
| | - Dhanraj M Ganapathy
- Saveetha Dental College, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai 77, India
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Belgin HB, Kale E, Özçelik TB, Yilmaz B. Marginal fit of 3-unit CAD-CAM zirconia frameworks fabricated using cone beam computed tomography scans: an experimental study. Odontology 2021; 110:339-348. [PMID: 34665345 DOI: 10.1007/s10266-021-00668-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Accepted: 10/12/2021] [Indexed: 11/30/2022]
Abstract
Whether cone beam computed tomography (CBCT) scans can be used for the fabrication of computer-aided design and computer-aided manufacturing (CAD-CAM) fixed dental prostheses (FDPs) is not known. The purpose of the present study was to compare the marginal fit of 3-unit zirconia FDPs fabricated by using CBCT or 3-dimensional (3D) laboratory scanning. Extracted second premolar and molar teeth in a maxillary typodont model were prepared. The first molar was removed and the typodont model was scanned with a laboratory or a CBCT scanner to generate two virtual 3D cast groups (3DL and CBCT). Forty four 3-unit zirconia FDPs were designed on virtual casts and milled. The vertical marginal discrepancy (VMD) was measured by ×100-magnification microscopy at seven locations on each abutment. A total of 616 measurements were made at 14 fixed locations in two groups of 22 specimens. The VMD data for 3DL and CBCT groups were statistically analyzed using the Mann-Whitney U test (α = 0.05). The mean VMDs on premolar ranged between 44 and 55 µm (median: 43-55 µm) in 3DL, and 74 and 100 µm (median: 72-93 µm) in CBCT; and on the molar, between 47 and 114 µm (median: 46-114 µm) in 3DL, and 91 and 162 µm (median: 93-156 µm) in CBCT. There was a significant difference between the gaps in 3DL and CBCT groups (p < 0.001). FDPs fabricated using 3D laboratory scanner had significantly smaller VMDs. Nevertheless, the 3-unit zirconia FDPs fabricated using CBCT scans presented promising marginal integrity.
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Affiliation(s)
- Hüseyin Berkay Belgin
- Department of Prosthodontics, Mustafa Kemal University Faculty of Dentistry, Antakya, Hatay, Turkey
| | - Ediz Kale
- Department of Prosthodontics, Mustafa Kemal University Faculty of Dentistry, Antakya, Hatay, Turkey. .,Private ESTA Oral and Dental Health Polyclinic, Izmir Avenue No. 76/1, Karaman Dist., 16200, Nilufer, Bursa, Turkey.
| | - Tuncer Burak Özçelik
- Department of Prosthodontics, Başkent University Faculty of Dentistry, Ankara, Turkey
| | - Burak Yilmaz
- Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, Bern, Switzerland.,Department of Restorative, Preventive and Paediatric Dentistry, School of Dental Medicine, University of Bern, Bern, Switzerland.,Division of Restorative and Prosthetic Dentistry, The Ohio State University, Columbus, OH, USA
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12
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Sichi LGB, Pierre FZ, Arcila LVC, de Andrade GS, Tribst JPM, Ausiello P, di Lauro AE, Borges ALS. Effect of Biologically Oriented Preparation Technique on the Stress Concentration of Endodontically Treated Upper Central Incisor Restored with Zirconia Crown: 3D-FEA. Molecules 2021; 26:6113. [PMID: 34684695 PMCID: PMC8538003 DOI: 10.3390/molecules26206113] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 10/03/2021] [Accepted: 10/04/2021] [Indexed: 01/19/2023] Open
Abstract
The aim of this study was to evaluate the effect of biologically oriented preparation technique on the stress concentration of endodontically treated upper central incisors restored with zirconia crown (yttria-stabilized zirconia polycrystalline ceramic) through finite element analysis (FEA). Four models of maxillary central incisors containing enamel, dentin, periodontal ligament, cortical and medullary bone were created in CAD. Each model received a polymeric core-build up with nanofilled dental resin composite. The evaluated models were SM-preparation in shoulder 90°; CM-chamfer preparation; BOPT-biologically oriented preparation technique and BOPTB-BOPT preparation 1 mm below the cement-enamel junction. All models received zirconia crowns (5Y-TZP), fiberglass post and 1 mm ferrule. The models were imported into the analysis software with parameters for mechanical structural testing using the maximum principal stress and the tensile strength as the analysis criteria. Then, load of 150 N was applied at the cingulum with 45° slope to the long axis of the tooth, with the fixed base for each model. The type of marginal preparation affected the stresses concentration in endodontically treated teeth and in the zirconia crown margin. Considering the stress magnitude only, BOPT is a viable option for anterior monolithic zirconia crowns; however, with the highest stress magnitude at the restoration margin.
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Affiliation(s)
- Luigi Giovanni Bernardo Sichi
- Department of Dental Materials and Prosthodontics, Institute of Science and Technology, São Paulo State University (Unesp), São José dos Campos 12245-000, Brazil
| | - Fernanda Zapater Pierre
- Department of Dental Materials and Prosthodontics, Institute of Science and Technology, São Paulo State University (Unesp), São José dos Campos 12245-000, Brazil
| | - Laura Viviana Calvache Arcila
- Department of Dental Materials and Prosthodontics, Institute of Science and Technology, São Paulo State University (Unesp), São José dos Campos 12245-000, Brazil
| | | | | | - Pietro Ausiello
- School of Dentistry, University of Naples Federico II, via S. Pansini 5, 80131 Naples, Italy
| | | | - Alexandre Luiz Souto Borges
- Department of Dental Materials and Prosthodontics, Institute of Science and Technology, São Paulo State University (Unesp), São José dos Campos 12245-000, Brazil
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Kim SS, Jeong JH, Lee JI, Cho HW. Effect of digital scans on marginal and internal discrepancies of zirconia crowns. J Prosthet Dent 2020; 124:461-467. [DOI: 10.1016/j.prosdent.2019.09.027] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Revised: 09/30/2019] [Accepted: 09/30/2019] [Indexed: 11/26/2022]
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Freifrau von Maltzahn N, Bernhard F, Kohorst P. Fitting accuracy of ceramic veneered Co-Cr crowns produced by different manufacturing processes. J Adv Prosthodont 2020; 12:100-106. [PMID: 32377323 PMCID: PMC7183853 DOI: 10.4047/jap.2020.12.2.100] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Revised: 02/18/2020] [Accepted: 02/25/2020] [Indexed: 12/05/2022] Open
Abstract
PURPOSE The purpose of this in vitro study was to evaluate the fitting accuracy of single crowns made from a novel presintered Co-Cr alloy prepared with a computer-aided design and computer-aided manufacturing (CAD/CAM) technique, as compared with crowns manufactured by other digital and the conventional casting technique. Additionally, the influence of oxide layer on the fitting accuracy of specimens was tested. MATERIALS AND METHODS A total of 40 test specimens made from Co-Cr alloy were investigated according to the fitting accuracy using a replica technique. Four different methods processing different materials were used for the manufacture of the crown copings (milling of presintered (Ceramill Sintron-group_cer_sin) or rigid alloy (Tizian NEM-group_ti_nem), selective laser melting (Ceramill NPL-group_cer_npl), and casting (Girobond NB-group_gir_nb)). The specimens were adapted to a resin model and the outer surfaces were airborne-particle abraded with aluminum oxide. After the veneering process, the fitting accuracy (absolute marginal discrepancy and internal gap) was evaluated by the replica technique in 2 steps, before removing the oxide layer from the intaglio surface of the crowns, and after removing the layer with aluminum oxide airborne-particle abrasion. Statistical analysis was performed by multifactorial analysis of variance (ANOVA) (α=.05). RESULTS Mean absolute marginal discrepancy ranged between 20 µm (group_cer_npl for specimens of Ceramill NPL) and 43 µm (group_cer_sin for crowns of Ceramill Sintron) with the oxide layer and between 19 µm and 28 µm without the oxide layer. The internal gap varied between 33 µm (group_ti_nem for test samples of Tizian NEM) and 75 µm (group_gir_nb for the base material Girobond NB) with the oxide layer and between 30 µm and 76 µm without the oxide layer. The absolute marginal discrepancy and the internal gap were significantly influenced by the fabrication method used (P<.05). CONCLUSION Different manufacturing techniques had a significant influence on the fitting accuracy of single crowns made from Co-Cr alloys. However, all tested crowns showed a clinically acceptable absolute marginal discrepancy and internal gap with and without oxide layer and could be recommended under clinical considerations. Especially, the new system Ceramill Sintron showed acceptable values of fitting accuracy so it can be suggested in routine clinical work.
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De Freitas BN, Tonin BSH, Macedo AP, Dos Santos TMP, De Mattos MDGC, Hotta TH, Matsumoto W. Adaptation accuracy of milled lithium disilicate crowns: A 2D and 3D microCT analysis. J ESTHET RESTOR DENT 2020; 32:403-409. [PMID: 32091666 DOI: 10.1111/jerd.12574] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2019] [Revised: 01/22/2020] [Accepted: 02/10/2020] [Indexed: 10/24/2022]
Abstract
OBJECTIVE Evaluate the effects of the scanning techniques and the crystallization in the internal and marginal adaptation of milled lithium disilicate crowns by two techniques computer microtomography analysis. MATERIALS AND METHODS Sixteen polyurethane teeth prepared for a complete crown were divided into two groups according to the scanner method (n = 8): indirect (IND), dental stone models were scanned with laser-surface scanner, and direct (DIR), digital typodont creates with an intraoral scanner. Internal and marginal gap were evaluated by micro-computed tomography (microCT). The replica technique (RT) was applied for analysis of total volume (TV) and marginal volume (MV) gap in microCT. The data showed normal distribution (Shapiro-Wilk test). One-way ANOVA (scanner techniques) with repeated measures (crystallization) was performed. Multiple comparisons were performed with Bonferroni adjustment (α = .05). RESULTS The axial gap showed a significant difference between the times (P = .017) for lower values after crystallization. The vertical marginal gap presented a significant difference in times for higher value after crystallization (P = .001). The marginal horizontal gap IND was greater than DIR after crystallization (P = .001) and IND before lower than after crystallization. For TV was not significant difference and MV in DIR was reduction (P = .002) after crystallization. CONCLUSION Crystallization changes the relationship between the crown and tooth, reducing internal gap and preventing the adequate fit in indirect and direct scanning. CLINICAL SIGNIFICANCE The measure gap under technological methodology is useful for adjust clinical parameters prosthetic in the CAD/CAM and the applicability of the new possibilities of analysis.
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Affiliation(s)
- Bruna N De Freitas
- Department of Dental Materials and Prosthesis, School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil
| | - Bruna S H Tonin
- Department of Dental Materials and Prosthesis, School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil
| | - Ana P Macedo
- Department of Dental Materials and Prosthesis, School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil
| | - Thais M P Dos Santos
- Nuclear Instrumentation Laboratory, COPPE, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Maria D G C De Mattos
- Department of Dental Materials and Prosthesis, School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil
| | - Takami H Hotta
- Department of Dental Materials and Prosthesis, School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil
| | - Wilson Matsumoto
- Department of Dental Materials and Prosthesis, School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil
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Kale E, Cilli M, Özçelik TB, Yilmaz B. Marginal fit of CAD-CAM monolithic zirconia crowns fabricated by using cone beam computed tomography scans. J Prosthet Dent 2019; 123:731-737. [PMID: 31653403 DOI: 10.1016/j.prosdent.2019.05.029] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2018] [Revised: 05/30/2019] [Accepted: 05/31/2019] [Indexed: 11/29/2022]
Abstract
STATEMENT OF PROBLEM Information regarding the precision of monolithic zirconia crowns fabricated by using a standard computer-aided design and computer-aided manufacturing (CAD-CAM) workflow is available. However, information on the effect of a modified workflow using 3D laboratory scanning and/or cone beam computed tomography (CBCT) for monolithic zirconia crown fabrication is lacking. PURPOSE The purpose of this in vitro study was to evaluate the effect of different scans on the marginal fit of CAD-CAM monolithic zirconia crowns fabricated by 3D laboratory scanning and CBCT. MATERIAL AND METHODS An extracted maxillary left first molar was prepared and digitized by using a 3D laboratory scanner (D900; 3Shape A/S) (control group). The tooth was also scanned by CBCT (i-CAT; Imaging Sciences) to generate a second virtual 3D model (CBCTscan group). A tooth cast out of polyurethane (PU) (Zenotec Model; Wieland) was reproduced from the CBCT data by using a CAD software program (Dental System 2.6; 3Shape A/S) and milling machine (CORiTEC 550i; imes-icore) and further scanned by using the 3D laboratory scanner to generate a third virtual 3D model to represent a clinical scenario where a patient's cast is needed (PU3DLab group). A monolithic zirconia crown design (cement space: margin 40 μm, 1 mm above 70 μm) was used on the virtual models, and crowns were fabricated out of presintered zirconia blocks (ZenostarT4; Wieland) by using a 5-axis milling machine (CORiTEC 550i; imes-icore). The crowns were sintered (Sinterofen HT-S Speed; Mihm-Vogt), and the vertical marginal discrepancy (VMD) was measured by ×100-magnification microscopy. Measurements were made at 384 points in 3 groups of 16 specimens. The measurements for each specimen were averaged, and VMD mean values were calculated. The Kruskal-Wallis test was used for the statistical analysis (α=.05). The Mann-Whitney U test and Bonferroni adjustment were further used to compare the pairs (α=.017). RESULTS The mean VMD value was 41 μm (median: 38 μm) for the control group, 44 μm (median: 42 μm) for the CBCTscan, and 60 μm (median: 58 μm) for the PU3DLab. No significant difference was found between control and CBCTscan groups (P=.274). However, there was a significant difference between control and PU3DLab and CBCTscan and PU3DLab groups (P<.001). CONCLUSIONS Marginal fit of the crowns fabricated by using the 3D laboratory scanner and through the direct use of CBCT was better than that of the crowns fabricated by using the workflow that combined the use of CBCT, PU cast, and 3D laboratory scanner. All tested protocols enabled the fabrication of monolithic zirconia crowns with a marginal discrepancy smaller than 120 μm.
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Affiliation(s)
- Ediz Kale
- Assistant Professor, Department of Prosthodontics, Mustafa Kemal University Faculty of Dentistry, Hatay, Turkey.
| | - Mesutcan Cilli
- Research Assistant, Department of Prosthodontics, Mustafa Kemal University Faculty of Dentistry, Hatay, Turkey
| | - Tuncer Burak Özçelik
- Associate Professor, Department of Prosthodontics, Başkent University Faculty of Dentistry, Ankara, Turkey
| | - Burak Yilmaz
- Professor, Division of Restorative and Prosthetic Dentistry, The Ohio State University College of Dentistry, Columbus, Ohio
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Afify A, Haney S, Verrett R, Mansueto M, Cray J, Johnson R. Marginal discrepancy of noble metal-ceramic fixed dental prosthesis frameworks fabricated by conventional and digital technologies. J Prosthet Dent 2018; 119:307.e1-307.e7. [DOI: 10.1016/j.prosdent.2017.08.012] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2016] [Revised: 08/07/2017] [Accepted: 08/07/2017] [Indexed: 10/18/2022]
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Gaikwad BS, Nazirkar G, Dable R, Singh S. Comparative evaluation of marginal fit and axial wall adaptability of copings fabricated by metal laser sintering and lost-wax technique: An in vitro study. J Indian Prosthodont Soc 2018; 18:47-52. [PMID: 29430142 PMCID: PMC5799969 DOI: 10.4103/jips.jips_271_17] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2017] [Accepted: 11/23/2017] [Indexed: 11/29/2022] Open
Abstract
PURPOSE The present study aims to compare and evaluate the marginal fit and axial wall adaptability of Co-Cr copings fabricated by metal laser sintering (MLS) and lost-wax (LW) techniques using a stereomicroscope. MATERIALS AND METHODS A stainless steel master die assembly was fabricated simulating a prepared crown; 40 replicas of master die were fabricated in gypsum type IV and randomly divided in two equal groups. Group A coping was fabrication by LW technique and the Group B coping fabrication by MLS technique. The copings were seated on their respective gypsum dies and marginal fit was measured using stereomicroscope and image analysis software. For evaluation of axial wall adaptability, the coping and die assembly were embedded in autopolymerizing acrylic resin and sectioned vertically. The discrepancies between the dies and copings were measured along the axial wall on each halves. The data were subjected to statistical analysis using unpaired t-test. RESULTS The mean values of marginal fit for copings in Group B (MLS) were lower (24.6 μm) than the copings in Group A (LW) (39.53 μm), and the difference was statistically significant (P < 0.05). The mean axial wall discrepancy value was lower for Group B (31.03 μm) as compared with Group A (54.49 μm) and the difference was statistically significant (P < 0.05). CONCLUSIONS The copings fabricated by MLS technique had better marginal fit and axial wall adaptability in comparison with copings fabricated by the LW technique. However, the values of marginal fit of copings fabricated that the two techniques were within the clinically acceptable limit (<50 μm).
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Affiliation(s)
- Bhushan Satish Gaikwad
- Department of Prosthodontics and Crown and Bridge, Sinhgad Dental College and Hospital, Pune, Maharashtra, India
| | - Girish Nazirkar
- Department of Prosthodontics and Crown and Bridge, SMBT Dental College and Hospital, Ahmednagar, Maharashtra, India
| | - Rajani Dable
- Department of Prosthodontics and Crown and Bridge, Teerthanker Mahaveer Dental College and Research Centre, Moradabad, Uttar Pradesh, India
| | - Shailendra Singh
- Department of Prosthodontics and Crown and Bridge, SMBT Dental College and Hospital, Ahmednagar, Maharashtra, India
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de Almeida JGDSP, Guedes CG, Abi-Rached FDO, Trindade FZ, Fonseca RG. Marginal Fit of Metal-Ceramic Copings: Effect of Luting Cements and Tooth Preparation Design. J Prosthodont 2017; 28:e265-e270. [DOI: 10.1111/jopr.12685] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/19/2017] [Indexed: 12/01/2022] Open
Affiliation(s)
| | | | - Filipe de Oliveira Abi-Rached
- Department of Dental Materials and Prosthodontics, Universidade Estadual Paulista Julio de Mesquita Filho; Campus de Araraquara; Araraquara Brazil
| | - Flávia Zardo Trindade
- Department of Dental Materials and Prosthodontics, Universidade Estadual Paulista Julio de Mesquita Filho; Campus de Araraquara; Araraquara Brazil
| | - Renata Garcia Fonseca
- Department of Dental Materials and Prosthodontics, Universidade Estadual Paulista Julio de Mesquita Filho; Campus de Araraquara; Araraquara Brazil
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Kale E, Yilmaz B, Seker E, Özcelik TB. Effect of fabrication stages and cementation on the marginal fit of CAD-CAM monolithic zirconia crowns. J Prosthet Dent 2017; 118:736-741. [DOI: 10.1016/j.prosdent.2017.01.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2016] [Revised: 01/03/2017] [Accepted: 01/04/2017] [Indexed: 11/28/2022]
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Saravanakumar P, Thallam Veeravalli P, Kumar V A, Mohamed K, Mani U, Grover M, Thirumalai Thangarajan S. Effect of Different Crown Materials on the InterLeukin-One Beta Content of Gingival Crevicular Fluid in Endodontically Treated Molars: An Original Research. Cureus 2017; 9:e1361. [PMID: 28721329 PMCID: PMC5510969 DOI: 10.7759/cureus.1361] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2017] [Accepted: 06/16/2017] [Indexed: 11/05/2022] Open
Abstract
INTRODUCTION Crown materials used in fixed prosthodontics come into close and prolonged contact with the gingiva. OBJECTIVE The purpose of this study was to evaluate the effect of different crown materials on the interleukin-one beta (IL-1β) content of the gingival crevicular fluid and to study which crown material causes the highest inflammation on the marginal gingiva on a biochemical basis. MATERIALS AND METHODS Twenty patients with single endodontically treated tooth were examined. Contralateral teeth were taken as controls. The crown materials in contact with the marginal gingiva were divided into three groups: Group 1- metal, Group2- ceramic, Group 3-zirconia. The collected data were analyzed with International Bibliography of the Social Sciences (IBSS). Statistical Package for the Social Sciences (SPSS) Statistics software 23.0 (IBM Corp, Armonk, New York). All assay procedures were carried out and the results of the collected samples were calculated using the ELISA-AIDTM technique. RESULTS Multiple comparisons using one-way analysis of variance (ANOVA) between the materials on day zero, 45th and 90th day was highly significant with p=0.0005. Pairwise comparison using Tukey's honest significant difference (HSD) posthoc test was also highly statistically significant with p= 0.0005 except for ceramic & zirconia which were significant at p=0.04 on the 90th day. Multiple comparison using repeated measure of ANOVA with Bonferroni correction between day zero, 45th and 90th day was found to be statistically significant only for zirconia (p=0.002). CONCLUSION This study was conducted to evaluate the effect of different crown materials on the amount of marginal gingival inflammation by measuring the IL-1β content in gingival crevicular fluid (GCF). At the end of the three-month analysis, it was seen that the zirconia crowns exhibited the least marginal gingival inflammation.
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Affiliation(s)
- Prathibha Saravanakumar
- Department of Prosthodontics, Faculty of Dental Sciences, Sri Ramachandra University, Porur, Chennai, India
| | | | - Anand Kumar V
- Department of Prosthodontics, Faculty of Dental Sciences, Sri Ramachandra University, Porur, Chennai, India
| | - Kasim Mohamed
- Department of Prosthodontics, Faculty of Dental Sciences, Sri Ramachandra University, Porur, Chennai, India
| | - Umamaheswari Mani
- Department of Prosthodontics, Faculty of Dental Sciences, Sri Ramachandra University, Porur, Chennai, India
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Sakornwimon N, Leevailoj C. Clinical marginal fit of zirconia crowns and patients' preferences for impression techniques using intraoral digital scanner versus polyvinyl siloxane material. J Prosthet Dent 2017; 118:386-391. [PMID: 28222872 DOI: 10.1016/j.prosdent.2016.10.019] [Citation(s) in RCA: 67] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2016] [Revised: 10/16/2016] [Accepted: 10/17/2016] [Indexed: 10/20/2022]
Abstract
STATEMENT OF PROBLEM The use of digital intraoral scanners is increasing; however, evidence of its precision in making crown impressions clinically remains scarce. Patients should also feel more comfortable with digital impressions, but only a few studies evaluating this subject have been performed. PURPOSE The purpose of this clinical study was to evaluate the marginal fit of monolithic zirconia crowns and patients' preferences for digital impressions versus polyvinyl siloxane (PVS) impressions. MATERIAL AND METHODS Sixteen participants with indications for single molar crowns were included. After crown preparation, digital impressions by intraoral scanner and PVS impressions were made. The participants were asked to complete a 6-item questionnaire with a visual analog scale related to perceptions of each of the following topics: time involved, taste/smell, occlusal registration, size of impression tray/scanner, gag reflex, and overall preference. Computer-aided design and computer-aided manufacturing monolithic zirconia crowns were fabricated from both impressions. The crowns were evaluated intraorally, and a blinded examiner measured the marginal discrepancy of silicone replicas under a stereomicroscope. Intraexaminer reliability was evaluated by calculating the intraclass correlation coefficient. Data for patients' preferences and marginal discrepancies were analyzed using the paired t test (α=.05). RESULTS Visual analog scale scores for digital impressions were statistically significantly higher than those for PVS impressions in every topic (P<.05), except for occlusal registration. The results showed excellent reliability of the examiner with an intraclass correlation coefficient of .996. No significant difference was found in marginal discrepancies between the PVS group and the digital group on all sides (P>.05). CONCLUSIONS No differences were found in the clinical marginal fit of zirconia crowns fabricated from either digital impressions compared with PVS impressions. Furthermore, patients' satisfaction with digital impressions was significantly higher than with conventional impressions.
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Affiliation(s)
- Nawapat Sakornwimon
- Graduate student, Esthetic Restorative and Implant Dentistry, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Chalermpol Leevailoj
- Associate Professor and Program Director, Esthetic Restorative and Implant Dentistry, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand.
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Yildirim G, Uzun IH, Keles A. Evaluation of marginal and internal adaptation of hybrid and nanoceramic systems with microcomputed tomography: An in vitro study. J Prosthet Dent 2017; 118:200-207. [PMID: 28089331 DOI: 10.1016/j.prosdent.2016.11.005] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2016] [Revised: 11/05/2016] [Accepted: 11/07/2016] [Indexed: 11/28/2022]
Abstract
STATEMENT OF PROBLEM The accuracy of recently introduced chairside computer-aided design and computer-aided manufacturing (CAD-CAM) blocks is not well established, and marginal integrity and internal adaptation are not known. PURPOSE The purpose of this in vitro study was to evaluate the marginal and internal adaptation of hybrid and nanoceramics using microcomputed tomography (μ-CT). MATERIAL AND METHODS The marginal and internal adaptation of 3 polymer-infiltrated ceramic-network (PICN) materials (Vita Enamic [VE]; Lava Ultimate [LU]; Vita Suprinity [VS]) were compared with lithium disilicate (IPS e.max.CAD, IPS). Ninety-six specimens (48 dies and 48 crowns) were prepared (n=12 each group) using a chairside CAD-CAM system. The restorations were scanned with μ-CT, with 160 measurements made for each crown, and used in 2-dimensional (2D) analysis. The marginal adaptation of marginal discrepancy (MD), absolute marginal discrepancy (AMD), internal adaptation of shoulder area (SA), axial space (AS), and occlusal space (OS) were compared using appropriate statistical analysis methods (α=.05). Cement volumes were compared using 3D analysis. RESULTS The IPS blocks showed higher MD (130 μm), AMD (156 μm), SA (111 μm) (P<.05), AS (52 μm), and OS (192 μm) than the other blocks (P<.01). The adaptation values of VS were significantly lower than those of the IPS block (P<.05). The adaption values of the LU and VE blocks were significantly lower than those of others (P<.01) but were statistically similar to one another (P>.05). IPS had the largest cement space at 18 mm3 (P<.01). CONCLUSIONS The marginal and internal adaptation values were within a clinically acceptable range for all 3 hybrids and nanoceramics tested.
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Affiliation(s)
- Güler Yildirim
- Assistant Professor, Department of Prosthodontics, Faculty of Dentistry, Inonu University, Malatya, Turkey.
| | - Ismail H Uzun
- Assistant Professor, Department of Prosthodontics, Faculty of Dentistry, Inonu University, Malatya, Turkey
| | - Ali Keles
- Associate Professor, Department of Endodontics, Faculty of Dentistry, Ondokuz Mayis University, Samsun, Turkey
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Accuracy of the One-Stage and Two-Stage Impression Techniques: A Comparative Analysis. Int J Dent 2016; 2016:7256496. [PMID: 28003824 PMCID: PMC5143723 DOI: 10.1155/2016/7256496] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Revised: 09/19/2016] [Accepted: 10/05/2016] [Indexed: 11/18/2022] Open
Abstract
Introduction. One of the main steps of impression is the selection and preparation of an appropriate tray. Hence, the present study aimed to analyze and compare the accuracy of one- and two-stage impression techniques. Materials and Methods. A resin laboratory-made model, as the first molar, was prepared by standard method for full crowns with processed preparation finish line of 1 mm depth and convergence angle of 3-4°. Impression was made 20 times with one-stage technique and 20 times with two-stage technique using an appropriate tray. To measure the marginal gap, the distance between the restoration margin and preparation finish line of plaster dies was vertically determined in mid mesial, distal, buccal, and lingual (MDBL) regions by a stereomicroscope using a standard method. Results. The results of independent test showed that the mean value of the marginal gap obtained by one-stage impression technique was higher than that of two-stage impression technique. Further, there was no significant difference between one- and two-stage impression techniques in mid buccal region, but a significant difference was reported between the two impression techniques in MDL regions and in general. Conclusion. The findings of the present study indicated higher accuracy for two-stage impression technique than for the one-stage impression technique.
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Kale E, Seker E, Yilmaz B, Özcelik TB. Effect of cement space on the marginal fit of CAD-CAM-fabricated monolithic zirconia crowns. J Prosthet Dent 2016; 116:890-895. [DOI: 10.1016/j.prosdent.2016.05.006] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2015] [Revised: 05/03/2016] [Accepted: 05/04/2016] [Indexed: 10/21/2022]
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Rödiger M, Heinitz A, Bürgers R, Rinke S. Fitting accuracy of zirconia single crowns produced via digital and conventional impressions-a clinical comparative study. Clin Oral Investig 2016; 21:579-587. [PMID: 27469102 DOI: 10.1007/s00784-016-1924-y] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Accepted: 07/21/2016] [Indexed: 11/26/2022]
Abstract
OBJECTIVES This study focused on the clinical investigation of the internal and marginal fit of CAD/CAM-fabricated zirconia single crowns produced via conventional and digital impression techniques. MATERIALS AND METHODS In a private practice, 20 molar teeth, one from each of 20 patients, were prepared with a circumferential 1.0-mm deep chamfer and an occlusal reduction of 1.5 mm. Conventional impression (CI) taking with a polyvinylsiloxane material (Aquasil Monophase + Aquasil XLV; Dentsply, Konstanz, Germany) and intraoral scanning (IS) (Cara TRIOS; Heraeus, Hanau, Germany) of each of the preparations was performed, and then two respective zirconia copings per tooth were produced (20 crowns per group). The marginal and internal fit of the restorations was evaluated employing a replica technique. For statistical analysis, a pairwise comparison (Wilcoxon rank test) was performed. RESULTS Zirconia single crowns produced with the IS technique revealed a statistically significant better precision of internal fit only in specific areas (chamfer area/occlusal area). The evaluation of marginal fit showed no significant differences between the two groups. All restorations of both groups offered internal and marginal gaps within the postulated clinical tolerance ranges. CONCLUSIONS CAD/CAM-fabricated zirconia single crowns produced with CI and IS techniques offer adequate marginal and internal precision. However, the IS technique provides lower internal gaps in some specific areas. CLINICAL RELEVANCE The clinical precision of fit of restorations produced with a CI and an IS technique appeared to be equivalent. Therefore, the IS technique can be rated as a suitable alternative for the manufacturing of single crowns.
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Affiliation(s)
- Matthias Rödiger
- Department of Prosthodontics, University Medical Center Goettingen, Georg-August-University, Robert-Koch-Str. 40, 37075, Goettingen, Germany
| | - Arthur Heinitz
- Department of Prosthodontics, University Medical Center Goettingen, Georg-August-University, Robert-Koch-Str. 40, 37075, Goettingen, Germany
| | - Ralf Bürgers
- Department of Prosthodontics, University Medical Center Goettingen, Georg-August-University, Robert-Koch-Str. 40, 37075, Goettingen, Germany
| | - Sven Rinke
- Department of Prosthodontics, University Medical Center Goettingen, Georg-August-University, Robert-Koch-Str. 40, 37075, Goettingen, Germany.
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Oka Y, Sasaki JI, Wakabayashi K, Nakano Y, Okamura SY, Nakamura T, Imazato S, Yatani H. Fabrication of a radiopaque fit-testing material to evaluate the three-dimensional accuracy of dental prostheses. Dent Mater 2016; 32:921-8. [PMID: 27063458 DOI: 10.1016/j.dental.2016.03.011] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2015] [Revised: 09/09/2015] [Accepted: 03/22/2016] [Indexed: 10/22/2022]
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Ghaffari T, Hamedi-Rad F, Fakhrzadeh V. Marginal adaptation of Spinell InCeram and feldspathic porcelain laminate veneers. Dent Res J (Isfahan) 2016; 13:239-44. [PMID: 27274344 PMCID: PMC4878208 DOI: 10.4103/1735-3327.182183] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Background: This in vitro study investigated the marginal fit of two porcelain laminate veneers to help the selection of more accurate veneers in discolored teeth. Materials and Methods: Thirty impressions of metal master die created from the prepared labial surface of an acrylic maxillary central incisor were made and poured with Type IV stone. The dies were distributed into test groups (n = 15) for the construction of DuCeram and InCeram laminate veneers. An image-analysis program was used to measure the gap between the veneers and the master die at the labial, lingual, and proximal margins. Statistical analysis was performed with repeated measures ANOVA. Independent t-test was used to compare the mean values between the two groups. Values of P < 0.05 were judged to be significant. Results: Differences between marginal fit of two groups were significant (P < 0.001). The overall mean marginal gap values (μm) for InCeram and DuCeram were, respectively, 114.4 ± 40.81 and 282.3 ± 82.82. Independent t-test revealed significant differences between the marginal gaps of two materials at different predetermined points. Conclusion: Within the limitations of this study, the marginal gap in InCeram laminate veneer was within the clinically acceptable standard set at 120 μm.
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Affiliation(s)
- Tahereh Ghaffari
- Dental and Periodontal Research Center, Tabriz University of Medical Sciences, Tabriz, Iran; Department of Prosthodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Fahimeh Hamedi-Rad
- Department of Prosthodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Vahid Fakhrzadeh
- Department of Prosthodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
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Gobbetti E, Baldissara P. Confronto tra la precisione marginale di corone in disilicato di litio monolitiche (full-contour) e stratificate. DENTAL CADMOS 2016. [DOI: 10.1016/s0011-8524(16)30050-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Shembesh M, Ali A, Finkelman M, Weber HP, Zandparsa R. An In Vitro Comparison of the Marginal Adaptation Accuracy of CAD/CAM Restorations Using Different Impression Systems. J Prosthodont 2016; 26:581-586. [PMID: 26855068 DOI: 10.1111/jopr.12446] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/15/2015] [Indexed: 11/29/2022] Open
Abstract
PURPOSE To compare the marginal adaptation of 3-unit zirconia fixed dental prostheses (FDPs) obtained from intraoral digital scanners (Lava True Definition, Cadent iTero), scanning of a conventional silicone impression, and the resulting master cast with an extraoral scanner (3Shape lab scanner). MATERIALS AND METHODS One reference model was fabricated from intact, non-carious, unrestored human mandibular left first premolar and first molar teeth (teeth #19 and 21), prepared for a three-unit all-ceramic FDP. Impressions of the reference model were obtained using four impression systems (n = 10), group 1 (PVS impression scan), group 2 (stone cast scan), group 3 (Cadent iTero), and group 4 (Lava True Defintion). Then the three-unit zirconia FDPs were milled. Marginal adaptation of the zirconia FDPs was evaluated using an optical comparator at four points on each abutment. The mean (SD) was reported for each group. One-way ANOVA was used to assess the statistical significance of the results, with post hoc tests conducted via Tukey's HSD. p < 0.05 was considered statistically significant. All analyses were done using SPSS 22.0. RESULTS The mean (SD) marginal gaps for the recorded data from highest to lowest were silicone impression scans 81.4 μm (6.8), Cadent iTero scan 62.4 μm (5.0), master cast scan 50.2 μm (6.1), and Lava True definition scan 26.6 μm (4.7). One-way ANOVA revealed significant differences (p < 0.001) in the mean marginal gap among the groups. The Tukey's HSD tests demonstrated that the differences between all groups (silicone impression scan, master cast scan, Lava True definition scan, iTero Cadent scan) were statistically significant (all p < 0.001). On the basis of the criterion of 120 μm as the limit of clinical acceptance, all marginal discrepancy values of all groups were clinically acceptable. CONCLUSIONS Within the confines of this in vitro study, it can be concluded that the marginal gap of all impression techniques was within the acceptable clinical limit (120 μm). Group 4 (Lava True Defintion) showed the lowest average gap among all groups followed by group 2 (stone cast scan), group 3 (Cadent iTero), and group 1 (PVS impression scan); these differences were statistically significant.
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Affiliation(s)
- Marwa Shembesh
- Department of Prosthodontics and Operative Dentistry, Tufts University School of Dental Medicine, Boston, MA
| | - Ala Ali
- Department of Prosthodontics and Operative Dentistry, Tufts University School of Dental Medicine, Boston, MA
| | - Matthew Finkelman
- Department of Prosthodontics and Operative Dentistry, Tufts University School of Dental Medicine, Boston, MA
| | - Hans-Peter Weber
- Department of Prosthodontics and Operative Dentistry, Tufts University School of Dental Medicine, Boston, MA
| | - Roya Zandparsa
- Department of Prosthodontics and Operative Dentistry, Tufts University School of Dental Medicine, Boston, MA
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Berrendero S, Salido MP, Valverde A, Ferreiroa A, Pradíes G. Influence of conventional and digital intraoral impressions on the fit of CAD/CAM-fabricated all-ceramic crowns. Clin Oral Investig 2016; 20:2403-2410. [PMID: 26800669 DOI: 10.1007/s00784-016-1714-6] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2015] [Accepted: 01/10/2016] [Indexed: 12/01/2022]
Abstract
OBJECTIVES To compare the fit of all-ceramic crowns fabricated from conventional silicone impressions with the fit of all-ceramic crowns fabricated from intraoral digital impressions. METHODS Thirty patients with 30 posterior teeth with a prosthetic demand were selected. Zirconia-based ceramic crowns were made using an intraoral digital impression system (Ultrafast Optical Sectioning technology) (digital group, D) and 2-step silicone impression technique (conventional group, C). To replicate the interface between the crown and the preparation, each crown was cemented on its corresponding clinical preparation using ultra-flow silicone. Each crown was embedded in resin to stabilize the registered interface. Specimens were sectioned in buccolingual orientation, and internal misfit was measured at different areas using stereomicroscopy (×40). Data was analysed using Student's t test and Mann-Whitney test (α = 0.05). RESULTS No statistically significant differences were found (P > 0.05) between two groups. The mean internal misfit and mean marginal misfit were 170.9 μm (SD = 119.4)/106.6 μm (SD = 69.6) for group D and 185.4 μm (SD = 112.1)/119.9 μm (SD = 59.9) for group C. CONCLUSION Ceramic crowns fabricated using an intraoral scanner are comparable to elastomer conventional impressions in terms of their marginal and internal fits. The mean marginal fit in both groups was within the limits of clinical acceptability. CLINICAL SIGNIFICANCE Impressions based on Ultrafast Optical Sectioning technology can be used for manufacturing ceramic crowns in a normal workflow, with the same results as silicone conventional impressions.
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Affiliation(s)
- S Berrendero
- Department of Buccofacial Prostheses, Faculty of Dentistry, Complutense University of Madrid, Plaza Ramón y Cajal, S/N Ciudad Universitaria, 28040, Madrid, Spain.
| | - M P Salido
- Department of Buccofacial Prostheses, Faculty of Dentistry, Complutense University of Madrid, Plaza Ramón y Cajal, S/N Ciudad Universitaria, 28040, Madrid, Spain
| | - A Valverde
- Department of Buccofacial Prostheses, Faculty of Dentistry, Complutense University of Madrid, Plaza Ramón y Cajal, S/N Ciudad Universitaria, 28040, Madrid, Spain
| | - A Ferreiroa
- Department of Buccofacial Prostheses, Faculty of Dentistry, Complutense University of Madrid, Plaza Ramón y Cajal, S/N Ciudad Universitaria, 28040, Madrid, Spain
| | - G Pradíes
- Department of Buccofacial Prostheses, Faculty of Dentistry, Complutense University of Madrid, Plaza Ramón y Cajal, S/N Ciudad Universitaria, 28040, Madrid, Spain
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Zeng L, Zhang Y, Liu Z, Wei B. Effects of repeated firing on the marginal accuracy of Co-Cr copings fabricated by selective laser melting. J Prosthet Dent 2015; 113:135-9. [DOI: 10.1016/j.prosdent.2014.09.004] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2014] [Revised: 08/29/2014] [Accepted: 09/02/2014] [Indexed: 10/24/2022]
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Three-dimensional evaluation of gaps associated with fixed dental prostheses fabricated with new technologies. J Prosthet Dent 2014; 112:1432-6. [DOI: 10.1016/j.prosdent.2014.07.002] [Citation(s) in RCA: 85] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2014] [Revised: 07/04/2014] [Accepted: 07/09/2014] [Indexed: 12/14/2022]
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Contrepois M, Soenen A, Bartala M, Laviole O. Marginal adaptation of ceramic crowns: A systematic review. J Prosthet Dent 2013; 110:447-454.e10. [DOI: 10.1016/j.prosdent.2013.08.003] [Citation(s) in RCA: 189] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Yucel MT, Aykent F, Avunduk MC. In vitro evaluation of the marginal fit of different all-ceramic crowns. J Dent Sci 2013. [DOI: 10.1016/j.jds.2012.05.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
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Prasad R, Al-Keraif AA, Kathuria N, Gandhi PV, Bhide SV. Accuracy of ringless casting and accelerated wax-elimination technique: a comparative in vitro study. J Prosthodont 2013; 23:157-62. [PMID: 23889829 DOI: 10.1111/jopr.12082] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/14/2013] [Indexed: 11/26/2022] Open
Abstract
PURPOSE The purpose of this study was to determine whether the ringless casting and accelerated wax-elimination techniques can be combined to offer a cost-effective, clinically acceptable, and time-saving alternative for fabricating single unit castings in fixed prosthodontics. MATERIALS AND METHODS Sixty standardized wax copings were fabricated on a type IV stone replica of a stainless steel die. The wax patterns were divided into four groups. The first group was cast using the ringless investment technique and conventional wax-elimination method; the second group was cast using the ringless investment technique and accelerated wax-elimination method; the third group was cast using the conventional metal ring investment technique and conventional wax-elimination method; the fourth group was cast using the metal ring investment technique and accelerated wax-elimination method. The vertical marginal gap was measured at four sites per specimen, using a digital optical microscope at 100× magnification. The results were analyzed using two-way ANOVA to determine statistical significance. RESULTS The vertical marginal gaps of castings fabricated using the ringless technique (76.98 ± 7.59 μm) were significantly less (p < 0.05) than those castings fabricated using the conventional metal ring technique (138.44 ± 28.59 μm); however, the vertical marginal gaps of the conventional (102.63 ± 36.12 μm) and accelerated wax-elimination (112.79 ± 38.34 μm) castings were not statistically significant (p > 0.05). CONCLUSIONS The ringless investment technique can produce castings with higher accuracy and can be favorably combined with the accelerated wax-elimination method as a vital alternative to the time-consuming conventional technique of casting restorations in fixed prosthodontics.
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Affiliation(s)
- Rahul Prasad
- Faculty, Prosthodontics and Dental Biomaterials Research, King Saud University, Riyadh, Saudi Arabia
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Kim KB, Kim WC, Kim HY, Kim JH. An evaluation of marginal fit of three-unit fixed dental prostheses fabricated by direct metal laser sintering system. Dent Mater 2013; 29:e91-6. [PMID: 23680302 DOI: 10.1016/j.dental.2013.04.007] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2012] [Revised: 10/19/2012] [Accepted: 04/19/2013] [Indexed: 10/26/2022]
Abstract
OBJECTIVES This in vitro study aimed to evaluate and compare marginal fit of three-unit fixed dental prostheses (FDPs) fabricated using a newly developed direct metal laser sintering (DMLS) system with that of three-unit FDPs by a conventional lost wax technique (LW) method. METHODS Ten cobalt-chromium alloy three-unit FDPs using DMLS system and another ten nickel-chromium alloy FDPs using LW method were fabricated. Marginal fit was examined using a light-body silicone. After setting, the silicon film was cut into four parts and the thickness of silicon layer was measured at 160× magnification using a digital microscope to measure absolute marginal discrepancy (AMD), marginal gap (MG) and internal gap (IG). A repeated measure ANOVA for statistical analysis was performed using the SPSS statistical package version 12.0 (α=0.05). RESULTS The mean values of AMD, MG, and IG were significantly larger in the DMLS group than in the LW group (p<0.001). Means of AMD, MG and IG in the first molars were 83.3, 80.0, and 82.0μm in the LW group; and 128.0, 112.0, and 159.5μm in the DMLS group, respectively. No significant difference between measurements for premolars and molars was found (p>0.05). SIGNIFICANCE The marginal fit of the DMLS system appeared significantly inferior compared to that of the conventional LW method and slightly larger than the acceptable range. For clinical application further improvement of DMLS system may be required.
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Affiliation(s)
- Ki-Baek Kim
- Department of Dental Laboratory Science and Engineering, Korea University, Seoul, Republic of Korea
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RINKE S, FORNEFETT D, GERSDORFF N, LANGE K, ROEDIGER M. Multifactorial analysis of the impact of different manufacturing processes on the marginal fit of zirconia copings. Dent Mater J 2012; 31:601-9. [DOI: 10.4012/dmj.2012-017] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Han HS, Yang HS, Lim HP, Park YJ. Marginal accuracy and internal fit of machine-milled and cast titanium crowns. J Prosthet Dent 2011; 106:191-7. [DOI: 10.1016/s0022-3913(11)60120-0] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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40
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Grenade C, Mainjot A, Vanheusden A. Fit of single tooth zirconia copings: comparison between various manufacturing processes. J Prosthet Dent 2011; 105:249-55. [DOI: 10.1016/s0022-3913(11)60040-1] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Fahmy NZ. Influence of Veneering Materials on the Marginal Fit and Fracture Resistance of an Alumina Core System. J Prosthodont 2010; 20:45-51. [DOI: 10.1111/j.1532-849x.2010.00626.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Shokry TE, Attia M, Mosleh I, Elhosary M, Hamza T, Shen C. Effect of metal selection and porcelain firing on the marginal accuracy of titanium-based metal ceramic restorations. J Prosthet Dent 2010; 103:45-52. [PMID: 20105684 DOI: 10.1016/s0022-3913(09)60216-x] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Affiliation(s)
- Tamer E Shokry
- Faculty of Dental Medicine, Al-Azhar University, Cairo, Egypt
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Gonzalo E, Suárez MJ, Serrano B, Lozano JF. A comparison of the marginal vertical discrepancies of zirconium and metal ceramic posterior fixed dental prostheses before and after cementation. J Prosthet Dent 2009; 102:378-84. [DOI: 10.1016/s0022-3913(09)60198-0] [Citation(s) in RCA: 98] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Tan PL, Gratton DG, Diaz-Arnold AM, Holmes DC. An In Vitro Comparison of Vertical Marginal Gaps of CADCAM Titanium and Conventional Cast Restorations. J Prosthodont 2008; 17:378-83. [DOI: 10.1111/j.1532-849x.2008.00302.x] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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Quante K, Ludwig K, Kern M. Marginal and internal fit of metal-ceramic crowns fabricated with a new laser melting technology. Dent Mater 2008; 24:1311-5. [PMID: 18384869 DOI: 10.1016/j.dental.2008.02.011] [Citation(s) in RCA: 110] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2007] [Revised: 02/17/2008] [Accepted: 02/18/2008] [Indexed: 10/22/2022]
Abstract
OBJECTIVES The purpose of this in vivo investigation was to evaluate the marginal and internal fit of metal-ceramic crowns fabricated with a new laser melting procedure (BEGO Medical, Bremen, Germany), and to investigate the influence of ceramic firing on the marginal and internal accuracy of these crowns. METHODS After tooth preparation, impression taking using polyvinylsiloxane and model casting, each preparation was contact less scanned by strip-light-projection. The finishing line and the virtual construction of the metal coping were defined by means of a computer. Using CAD/CAM software the metal copings were produced by BEGO Medical (Germany). A base metal alloy (Wirobond C) and a precious alloy (BioPontoStar, both: BEGO Medical) were used in this study with 14 restorations each. The internal and marginal accuracy of the specimens were examined using a silicone indicator paste (Fit Checker, GC, Japan). After setting, the silicone films were embedded in acrylic resin and sectioned four times. Each slice was photographed digitally at 60x magnification for marginal and at 15x magnification for occlusal adaptation, respectively. Using a light microscope the thickness of the silicone layer was measured at 10 reference points, a total of 3360 measurements. This procedure was repeated after the ceramic firing in the dental laboratory and after intraoral adjustment clinically. RESULTS No statistically significant differences between the two alloys were found at any time. The mean marginal discrepancies ranged from 74 to 99 microm for both alloys. The internal gaps ranged from 250 to 350 microm. Ceramic firing increased the marginal discrepancies while the internal gaps decreased especially at occlusal surface. However, only in one case a slight statistically significance could be determined (p=0.046). SIGNIFICANCE The results of this in vivo study show that crowns produced with laser melting technology exhibit a marginal and internal accuracy that is comparable to conventional production procedures.
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Affiliation(s)
- Katrin Quante
- Department of Prosthodontics, Propaedeutics and Dental Materials, Dental School, Christian-Albrechts University at Kiel, Germany
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Bronson MR, Lindquist TJ, Dawson DV. Clinical Acceptability of Crown Margins Versus Marginal Gaps as Determined by Pre-Doctoral Students and Prosthodontists. J Prosthodont 2005; 14:226-32. [PMID: 16359478 DOI: 10.1111/j.1532-849x.2005.00048.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
PURPOSE Marginal integrity is a very important element in evaluating a restoration; however, there is no agreement in definition of a clinically acceptable margin. The purpose of this investigation was to examine margin acceptability using an explorer versus the actual marginal gap widths at four locations on uncemented crowns on three extracted teeth using both predoctoral students and prosthodontists as evaluators. MATERIALS AND METHODS The crown margin evaluation used 16 surfaces of four crowns fitting to three extracted caries-free teeth fitted into a dentiform. The teeth (nos. 14, 20, and 29) were prepared for a full cast (gold) crown using a chamfer finish line configuration, with some margins supragingival and others subgingival. After final impressions and working casts were made, die spacer was applied to the marginal area of the die before waxing to vary the marginal opening. The dentiform was placed in a mannequin in a supine position. Predoctoral students (N = 10) and prosthodontists (N = 9) evaluated each axial surface of each crown in the zone along the margin with an explorer and rated each surface as either "clinically acceptable" or "unacceptable." After casting, the axial marginal openings were measured with Image Pro Software using a digital microscopic image of the surface. Each participant repeated the margin evaluations 6 months later. RESULTS Upon casting, marginal gaps ranged from 40 microm to 615 microm. The proportions of prosthodontists and of predoctoral students rating a given surface as "clinically unacceptable" were highly correlated (Spearman rank correlation = 0.81, p= 0.0001). The prosthodontists did not provide more or fewer ratings of clinical acceptability than the students, although kappa results indicated that the prosthodontists might be more consistent among themselves than the student raters. Upon re-evaluation, both groups rated between one and six of the surfaces differently than they had previously: the median number of inconsistencies was 1 for prosthodontists and 3 for predoctoral students. The prosthodontists tended to have fewer inconsistencies than the predoctoral students (0.05 < p < 0.10 Wilcoxon rank sum test), but this was not statistically significant. CONCLUSION The data provided evidence that those surfaces associated with greater margin gaps tended to have a greater proportion of ratings of "clinically unacceptable." The proportion of prosthodontists and predoctoral students rating a margin "clinically unacceptable" were highly correlated. Prosthodontists tended to have fewer inconsistencies than predoctoral students, but that difference was not statistically significant.
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Wöstmann B, Blösser T, Gouentenoudis M, Balkenhol M, Ferger P. Influence of margin design on the fit of high-precious alloy restorations in patients. J Dent 2005; 33:611-8. [PMID: 16005801 DOI: 10.1016/j.jdent.2005.01.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
OBJECTIVE It was the objective of this study, to analyze the influence of the marginal design on the marginal accuracy of a casting in a clinical setup in patients. METHODS Ninety volunteer patients' teeth-which were intended for extraction due to medical reasons-were prepared prior to extraction. Three different types of finishing line-chamfer, 135 degrees shoulder and 90 degrees shoulder-were employed. Two each c-silicone and pvs impressions were taken of each tooth using either a two-stage or a one-stage putty-wash technique. After preparation and impression taking the teeth were extracted. Gypsum casts were poured from the impressions and high precious alloy castings fabricated on the dies and marginal discrepancies were determined on the extracted teeth. RESULTS The median value of marginal discrepancies was lower than 150 microm for all groups. The difference between the three different preparation types was significant (H-test, p<0.05). The lowest median values were obtained for the chamfer preparations, while the 90 degrees shoulders always produced the highest median values. Preparations at gingva level exhibited more accurate marginal fit than subgingival preparations. No significant differences could be observed between the pvs and c-silicone materials or the one-step and two-step putty-wash techniques. CONCLUSIONS The marginal designs of the preparations had much less influence on the marginal fit of high precious alloy castings than expected. There is considerable reason to assume that technical but clinical parameters influence the quality of fixed prosthodontics much more than has been believed in the past.
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Affiliation(s)
- Bernd Wöstmann
- Department of Prosthodontics, Dental School, Justus-Liebig-University, Schlangenzahl 14, D-35392 Giessen, Germany.
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Quintas AF, Oliveira F, Bottino MA. Vertical marginal discrepancy of ceramic copings with different ceramic materials, finish lines, and luting agents: an in vitro evaluation. J Prosthet Dent 2004; 92:250-7. [PMID: 15343160 DOI: 10.1016/j.prosdent.2004.06.023] [Citation(s) in RCA: 115] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
STATEMENT OF PROBLEM Prosthetic restorations that fit poorly may affect periodontal health and occlusion. Studies that have evaluated the accuracy of fit of ceramic restorations before and after cementation assessed primarily intracoronal restorations. PURPOSE This in vitro study evaluated the effect of different finish lines, ceramic manufacturing techniques, and luting agents on the vertical discrepancy of ceramic copings. MATERIAL AND METHODS Two stainless steel molars were prepared for complete crowns with 2 different finish lines (heavy chamfer and rounded shoulder); each molar was duplicated to fabricate 90 copings. A total of 180 copings generated 18 groups (n=10 for each finish line-coping material-luting agent combination). Luting agents tested included zinc phosphate, resin-modified glass ionomer (Fuji Plus), and resin composite cements (Panavia F). A metal frame was developed on which to screw the stainless steel model and a ceramic coping; the distance (microm) between 2 predetermined points was measured before and after cementation by a profile projector under a torquing force. A 4-way ANOVA with repeated measurements was performed to assess the influence of each factor in the vertical marginal discrepancy: 3 between-coping factors (finish line-coping material-luting agent) and 1 within-coping factor (before and after cementation) (alpha=.05). RESULTS Procera copings presented the lowest mean values ( P <.05) of vertical marginal discrepancy before and after cementation (25/44 microm) when compared to Empress 2 (68/110 microm) and InCeram Alumina copings (57/117 microm), regardless of any combinations among all finish lines and luting agents tested. CONCLUSION Considering each factor separately, the ceramic manufacturing technique appeared to be the most important factor tested for the definitive vertical discrepancy of all-ceramic copings, with lower mean values for Procera copings.
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Abstract
The contemporary dentist has a wide variety of options to use in the restoration of extensively damaged or previously restored teeth. Metal-ceramic and all-ceramic crowns are frequently used to restore esthetics and function. One of the essentials for success with either option is proper tooth preparation, which includes proper selection and preparation of the cervical margin of the preparation.
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Affiliation(s)
- Terry E Donovan
- University of Southern California School of Dentistry, University Park MC0641, 925 West 34th Street, Los Angeles, CA 90089-0641, USA.
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