• R Temizkan Nizaroglu and C Küçük.
• Department of Prosthodontics, Istanbul, Türkiye.
• Niger J Clin Pract. 2024 Jan 1; 27 (1): 546154-61.

BackgroundMarginal and internal adaptation are key factors that determine the clinical success of dental restorations.AimThe aim of this study is to evaluate the marginal and internal fit of crowns fabricated with three different CAD-CAM zirconia materials; two monolithic zirconia materials and one veneered zirconia copings in comparison with conventional metal-ceramic crowns.Material And MethodsNinety-six extracted molars (n = 96) were selected. Teeth were randomly divided into four groups (n = 24), and the following restorations were fabricated: Metal-ceramic crowns (Control group) (Group CG); monolithic zirconia crowns (GC initial) (Group MZ1); monolithic zirconia crowns (InCoris TZI),(Group MZ2); bilayered zirconia crowns, cores (InCoris ZI) veneered with a low-fusing glass-ceramic (IPS Emax Ceram),(Group BZ). Internal and marginal adaptations were evaluated using the silicone replica technique. A total of 20 points were recorded for every tooth under the light microscope at 20x magnifications. Results were compared using one-way analysis of variance (ANOVA) and the posthoc Tukey's test at a significance level of 0.01.ResultsMarginal, marginal-internal, axial, and occlusal gaps between CG, MZ1, MZ2, and BZ crowns showed statistically significant differences (P < 0.01).ConclusionMonolithic zirconia groups showed better marginal adaptation compared with the veneered zirconia crowns.Copyright © 2024 Copyright: © 2024 Nigerian Journal of Clinical Practice.

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