scholarly journals Marginal and internal fit of zirconia based fixed dental prostheses fabricated with different concepts

2010 ◽  
pp. 5 ◽  
Author(s):  
Florian Beuer
Keyword(s):  
Dental Prostheses ◽  
Fixed Dental Prostheses ◽  
Internal Fit

scholarly journals A Comparison Study of Marginal and Internal Fit Assessment Methods for Fixed Dental Prostheses

2019 ◽  
Vol 8 (6) ◽  
pp. 785 ◽  
Author(s):  
Keunbada Son ◽  
Sangbong Lee ◽  
Seok Hyon Kang ◽  
Jaeseok Park ◽  
Kyu-Bok Lee ◽  
...  
Keyword(s):  
Assessment Methods ◽  
Comparison Study ◽  
Micro Computed Tomography ◽  
Replica Technique ◽  
Cross Sectional ◽  
Mean Values ◽  
Axial Angle ◽  
Dental Prostheses ◽  
Fixed Dental Prostheses ◽  
Internal Fit

Numerous studies have previously evaluated the marginal and internal fit of fixed prostheses; however, few reports have performed an objective comparison of the various methods used for their assessment. The purpose of this study was to compare five marginal and internal fit assessment methods for fixed prostheses. A specially designed sample was used to measure the marginal and internal fit of the prosthesis according to the cross-sectional method (CSM), silicone replica technique (SRT), triple scan method (TSM), micro-computed tomography (MCT), and optical coherence tomography (OCT). The five methods showed significant differences in the four regions that were assessed (p < 0.001). The marginal, axial, angle, and occlusal regions showed low mean values: CSM (23.2 µm), TSM (56.3 µm), MCT (84.3 µm), and MCT (102.6 µm), respectively. The marginal fit for each method was in the range of 23.2–83.4 µm and internal fit (axial, angle, and occlusal) ranged from 44.8–95.9 µm, 84.3–128.6 µm, and 102.6–140.5 µm, respectively. The marginal and internal fit showed significant differences depending on the method. Even if the assessment values of the marginal and internal fit are found to be in the allowable clinical range, the differences in the values according to the method should be considered.

scholarly journals Marginal and Internal Fit of Cobalt-Chromium Fixed Dental Prostheses Generated from Digital and Conventional Impressions

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Per Svanborg ◽  
Henrik Skjerven ◽  
Pablo Carlsson ◽  
Alf Eliasson ◽  
Stig Karlsson ◽  
...  
Keyword(s):  
Digital Impression ◽  
Cobalt Chromium ◽  
Marginal Gap ◽  
Impression Material ◽  
Dental Prostheses ◽  
Digital Impressions ◽  
Fixed Dental Prostheses ◽  
Internal Fit ◽  
Cervical Area ◽  
Scan Protocol

Objectives. Digital impressions are increasingly used and have the potential to avoid the problem of inaccurate impressions. Only a few studies to verify the accuracy of digital impressions have been performed. The purpose of this study was to compare the marginal and internal fit of 3-unit tooth supported fixed dental prostheses (FDPs) fabricated from digital and conventional impressions.Methods. Ten FDPs were produced from digital impressions using the iTero system and 10 FDPs were produced using vinyl polysiloxane (VPS) impression material. A triple-scan protocol and CAD software were used for measuring and calculating discrepancies of the FDPs at 3 standard areas: mean internal discrepancy, absolute marginal gap, and cervical area discrepancy. The Mann-Whitney U test was used for analyzing the results.Results. For conventional and digital impressions, respectively, FDPs had an absolute marginal gap of 147 μm and 142 μm, cervical area discrepancy of 69 μm and 44 μm, and mean internal discrepancy of 117 μm and 93 μm. The differences were statistically significant in the cervical and internal areas (P<0.001).Significance. The results indicated that the digital impression technique is more exact and can generate 3-unit FDPs with a significantly closer fit compared to the VPS technique.

scholarly journals The Internal and Marginal Adaptation of Zirconia Based Fixed Dental Prostheses in the Posterior Region

2021 ◽  
Author(s):  
Ayşe Koçak-Büyükdere ◽  
Atilla Sertgöz
Keyword(s):  
Cross Sections ◽  
Clinical Success ◽  
Optical Microscope ◽  
Marginal Adaptation ◽  
Dental Prostheses ◽  
Occlusal Surfaces ◽  
Cad Cam ◽  
Molar Teeth ◽  
Fixed Dental Prostheses ◽  
Internal Fit

Purpose:Long-term clinical success is closely related to the internal and marginal adaptation of the restorations. Thepurpose of this study was to evaluate the internal adaptation of zirconia-based fixed dental prostheses in the posteriorregion.Materials & Methods:Four-unit porcelain-fused to zirconia fixed dental prostheses were fabricated with CAD-CAMsystem in 20 patients. For the evaluation of the restorations’ internal fit, conventional silicone replicas were used withthe optical microscope. The obtained silicone impression was cut to obtain two cross-sections from buccolingual and 3from mesiodistal. Fifty different measurements were taken from every tooth by taking 10 from each cross- section; 2from the margin, 6 from the axial surfaces and 2 from the occlusal by the optical microscope.Results:There were statistically significant differences in internal discrepancy in terms of area and tooth type. Theaverage internal discrepancy on the axial surfaces of the molars was 142.39±47.42μm. In premolars, the mean was139.53±46.80μm. The average of the internal discrepancy values obtained from occlusal surfaces of the molar teeth was164.39±53.61μm, whereas the same average for the premolar teeth was 161.92±60.54μm.Conclusion:Within the limitations of this study, restorations fabricated by CAD/CAM and internal and marginaldiscrepancies were at clinically acceptable intervals

Sign in / Sign up

Export Citation Format

Share Document