Evaluation of fracture resistance of teeth with Class II Mesio-Occluso- Distal cavities restored by three different esthetic restorative materials: An In-vitro study

Abstract

Aim - The aim of present investigation was to assess fracture resistance of teeth with Class II Mesio-Occluso-Distal (MOD) cavities filled with Microhybrid composite, Nanohybrid composite and Cention-N. Materials and Methods - 40 extracted maxillary premolars were kept in 0.1% thymol solution for 7 days, then subsequently in normal saline until use. All specimens were embedded 2mm below Cemento-enamel junction (CEJ) in self cure acrylic resin molds. They were then arbitrarily divided in 4 groups, each with 10 specimens (n=10). Group 1 consisted of intact teeth (Control group), whereas Group 2,3 and 4 contained prepared teeth with standardized class II MOD cavities filled with Microhybrid composite, Nanohybrid composite and Cention-N respectively. All the specimens were finished using composite finishing & polishing kit and were stored in 100% humidity at 37℃ for 24 hours. Each specimen was subjected to Fracture resistance (N) under Universal Testing Machine. Data collected was subjected to One-way analysis of variance and then subsequently to Tukey’s post-hoc test. Differences in groups were considered significant at p ≤ 0.05. Results - The results showed that Cention-N exhibited highest fracture resistance whereas Microhybrid composite had least fracture resistance when compared to other restorative groups. Conclusion - It can be inferred that Cention-N can be preferred for restoration of Class II MOD cavities in maxillary premolars over Nanohybrid composite or Microhybrid composite. Keywords - Cention-N, fracture resistance, Mesio-Occluso-Distal cavities, Microhybrid composite, Nanohybrid composite, Universal testing machine