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VOLUME 19 , ISSUE 6 ( 2018 ) > List of Articles

ORIGINAL RESEARCH

Comparison of Cuspal Deflection and Microleakage of Premolar Teeth restored with Three Restorative Materials

Ebrahim Yarmohamadi, Pegah R Jahromi, Mahdi Akbarzadeh

Keywords : Bulk fill composite, Cuspal deflection, Microleakage, Ormocer.

Citation Information : Yarmohamadi E, Jahromi PR, Akbarzadeh M. Comparison of Cuspal Deflection and Microleakage of Premolar Teeth restored with Three Restorative Materials. J Contemp Dent Pract 2018; 19 (6):684-689.

DOI: 10.5005/jp-journals-10024-2320

License: CC BY-NC 3.0

Published Online: 01-06-2018

Copyright Statement:  Copyright © 2018; Jaypee Brothers Medical Publishers (P) Ltd.


Abstract

Aim: This study aimed to assess cuspal deflection and microleakage of mesio-occluso-distal (MOD) cavities in premolar teeth restored with three different tooth-colored restorative materials to determine the effect of polymerization shrinkage stress over time. Materials and methods: The MOD cavities (4 mm depth) were prepared in 30 sound human maxillary premolars. The teeth were randomly divided into three groups (n = 10). The teeth were then restored with Filtek P60 (group I), X-tra fil (group II), and Admira Fusion x-tra (group III). Cuspal deflection was assessed after 5 minutes, 24 hours, 48 hours, and 7 days by measuring the intercuspal distance. After restoring the teeth, they were subjected to 1,000 thermal cycles and were then immersed in 2% methylene blue for 24 hours. After vertical section of teeth, they were observed under a stereomicroscope to assess microleakage. Data were analyzed using one-way analysis of variance (ANOVA) and Tukey\'s honest significant difference (HSD) post hoc test. Friedman test was used to compare different time points in each group and nonparametric Mann–Whitney test was applied to assess microleakage (α 0.05). Results: The mean cuspal deflection was significantly different in the three groups (p < 0.001). The highest deflection was noted in Filtek P60 (14.8 ± 1.9) and the lowest was noted in Admira Fusion x-tra (7.4 ± 1.4 μm). Cuspal deflection significantly decreased after 7 days, but did not return to the baseline value. Admira Fusion x-tra showed significantly less deflection after 7 days (p < 0.001), but the other two groups were the same (p = 0.3). Microleakage was not significantly different among the three groups (p > 0.05). Conclusion: The lowest cuspal deflection was noted in Admira Fusion x-tra, although marginal microleakage was not significantly different among the groups. Clinical significance: As the lowest cusp deflection was noted in Admira Fusion x-tra, this restorative material can be suitable for esthetic restoration of extensive posterior cavities.


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