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Purpose: The current in-vitro investigation analyzed the impact of speed sintering and different finish line width on marginal adaptation, internal fit and microleakage of translucent monolithic zirconia crowns.Materials and Methods: Sixty maxillary premolars were reduced based on basic guidelines of tooth preparation for a zirconia crown with either 0.5, 0.8 and 1.2 mm chamfer width (n=20each finish line width). After digital scanning and milling of zirconia crowns, the sintering procedure was performed in special furnace for two different sintering programs (n =10 per group) following either standard or speed sintering procedure. Each crown was cemented to its corresponding prepared tooth utilizing self-adhesive-resin cement. After 15000 thermal cycles between 5°C and 55°C, specimens were submersed in methylene blue for 12 hours. After sectioning bucco-lingually, marginal gap and cement film thickness values were recorded at nine sites using a digital microscope followed by microleakage scores examination.Results: Tested groups with 0.5 mm chamfer widths had the greatest mean marginal gap values of 47.9±5.4 and 50.1±5.6 µm for both conventional and speed sintering respectively, while groups with 1.2 chamfer widths had the lowest mean gap values of 42.3±5.6 and 44.5±5 µm for both standard and speed sintering, respectively. Two-way ANOVA revealed statically insignificant impact of sintering procedure on crown adaptation (p=.08). The greatest mean microleakage score (3±088 µm) was obtained from the 0.5 mm chamfer width group, while the smallest (2±0.78 µm) score was obtained from the 1.2 mm chamfer width group. Conclusions: Marginal adaptation and internal fit of translucent monolithic zirconia crowns are affected by width of the preparation margin while sintering protocol has little impact on adaptation.

Impact of speed sintering on marginal discrepancy, internal fit and microleakage of monolithic zirconia crowns with different chamfer width