Evaluating marginal fit and internal accuracy of various CAD-CAM copings- A SEM study
European Journal of Molecular & Clinical Medicine,
2020, Volume 7, Issue 10, Pages 3933-3943
AbstractBackground: Marginal fit is critical for the success and longevity of a dental restoration. Zirconia crowns can be fabricated either chair-side, in a dental laboratory or in a milling center; each can give different marginal accuracy and internal fits. However, discussion of the marginal fit of zirconia crowns when different fabrication methods are compared is lacking in the literature.
AIM: This study was conducted to compare and evaluate the marginal accuracy and internal fit of base metal alloy copings fabricated through CAD metal laser sintering, zirconia copings fabricated by CAD/CAM technique and zirconia copings fabricated by copy milling using SEM (Scanning electron microscope).
Material and method: In vitro study was conducted in the to evaluate marginal accuracy and internal fit under scanning electron microscope of the zirconia copings fabricated using CAD/CAM and copy milling and metal copings fabricated using metal laser sintering using 36 Ivorine tooth (12 in each group) corresponding to mandibular 1st molar. Data were analyzed using the one-way ANOVA technique and Post hoc correction.
Results: CAD/CAM zirconia copings provide better marginal accuracy and better internal fit among the study group while comparing the internal fit of the metal copings fabricated by CAD metal laser sintering and zirconia copings fabricated by copy milling and CAD/CAM.
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