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- W2170677754 abstract "ABSTRACT Purpose To compare the marginal accuracy of temporary crowns in vitro , using two autopolymerizing temporary crown materials. Materials and Methods Polyethyl methacrylate and bis-acryl composite were used to make 15 temporary crowns each, on an ivorine mandibular first molar, prepared as to receive a porcelain-fused-to-metal (PFM) crown. Matrices were made of polyvinyl siloxane impressions of a lower typodont arch. After crowns were fabricated, margins of the crowns were trimmed under magnification. Afterwards, margins of prepared tooth and crowns were marked. Each tooth-crown assembly was then observed under microscope (4×). With digital images of each surface, gap between margins of crown and preparation margin was measured in millimeters using computer software, after calibration. Two examiners made the measurements. Independent samples t-test and one-way ANOVA with Bonferroni post hoc analysis were applied to determine the mean marginal gap. Results Bis-acryl composite crowns exhibited 0.2 mm (SD ± 0.11) mean gap with greatest discrepancy at buccal margins. Mean gap with polyethyl methacrylate crowns was 0.3 mm (SD ± 0.17) with buccal and mesial margins exhibiting the greatest marginal discrepancy, at α <0.001. Conclusion Both materials did not exhibit ideal marginal accuracy, but temporary luting cement film thickness would compensate for the gap observed in the margins of bis-acryl composite crowns. How to cite this article Adnan S, Khan FR, Umer F. An in vitro Comparison of Marginal Accuracy in Temporary Crowns. J Contemp Dent 2013;3(3):121-126." @default.
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- W2170677754 date "2013-01-01" @default.
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- W2170677754 title "An in vitro Comparison of Marginal Accuracy in Temporary Crowns" @default.
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- W2170677754 doi "https://doi.org/10.5005/jp-journals-10031-1050" @default.
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