Open AccessThe Internal and Marginal Adaptation of Zirconia Based Fixed Dental Prostheses in the Posterior Region
Author(s) -
Ayşe Koçak Büyükdere,
Atilla Sertgöz
Publication year - 2021
Publication title -
european annals of dental sciences :
Language(s) - English
Resource type - Journals
ISSN - 2757-6744
DOI - 10.52037/eads.2021.0015
Subject(s) - premolar , molar , cubic zirconia , silicone , materials science , impression , orthodontics , dentistry , posterior teeth , scanning electron microscope , finish line , medicine , composite material , computer science , geology , ceramic , paleontology , race (biology) , world wide web
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