Fracture resistance and flexural strength of endodontically treated teeth restored by different short fiber resin composites: a preclinical study

Abstract

To evaluate the effect of using different short fiber-reinforced resin composites on fracture resistance and flexural strength of endodontically treated tooth and compare it with nano-filled resin composite. Sixty human premolars were used for the fracture resistance test. Root canals were sequentially enlarged using a Pro-taper system from SX to F3 and obturated with Gutta-percha. Mesio-Occluso-Distal (MOD) cavities were prepared in all teeth. Teeth were then divided into 3 groups (n = 20 each) based on the type of resin composite. Group 1: Alert fiber-reinforced resin composite, Group 2: EverX Flow fiber-reinforced resin composite, and Group 3: Z350 nano-filled resin composite. Each group were subjected to a load till fracture using a universal testing machine to measure the fracture resistance. For the flexural strength test, 10 specimens from each material were prepared and 3- point bending tests were performed. The results of both tests were analyzed by using Weibull analysis. Teeth restored with Ever X fiber-reinforced resin composite conveyed the highest significant fracture resistance and flexural strength value when compared to the other two materials. Short Fiber-reinforced resin composite can be considered a better choice for the restoration of MOD cavities in endodontically treated teeth.