Microhybrid and Flowable Microhybrid Dental Resin Composites Measured in Fracture Toughness

Decky J Indrani,Chairunnisa R R Chairunnisa,Andy Soufyan

doi:10.14693/jdi.v16i1.15

Abstract

Objectives. The aim of this study was to compare the fracture toughness of a microhybrid and a flowable microhyrid resin composites. Methods. Test specimens (30x15x2)mm made of a microhybrid and a flowable microhybrid were prepared in a double torsion mould and were then polymerized for 20 seconds using a light-curing device. Taken out from the mould, the specimens were than soaked in disfilled water (37°C) for 1 hour and then fractured in a double-torsion technique. t-Test was used to test significance difference between the microhybrid and flowable microhybrid resin composites. Result. The use of double-torsion technique resulted in crack initition and crack arrest which revealed Klc of 1.14 MN/m3/2 and 1.045 MN/m3/2 for the microhybrid and the flowable microhybrid resin composites, respectively. Both resin composites were insignificantly different in the fracture toughness values showed by t–Test. Conclusions. The present study suggested that there was no significant difference between the microhybrid and the flowable microhybrid resin composites tested. It appreared that filler fraction might not affect the fracture toughness of the resin composties tested. DOI: 10.14693/jdi.v16i1.15

Highlights

Microhybrid resin composites have been widely used in dentistry as posterior restoratives
Althought applied in low stress bearing area, flowable resin composite materials are still subjected to stress applications
According to Bonilla, et al (2003), there was no significant difference among 7 of the 9 composites tested and concluded that there was a weak correlation between the filler content by volume and the fracture toughness of these flowable resin composites

Summary

Introduction

Microhybrid resin composites have been widely used in dentistry as posterior restoratives These resin composites resulted in high viscosity materilas (Knobloch LA, et al, 2002, Bonilla ED, et al, 2001). According to Bonilla, et al (2003), there was no significant difference among 7 of the 9 composites tested and concluded that there was a weak correlation between the filler content by volume and the fracture toughness of these flowable resin composites. Several study reported that the double torsion test, provides the most information about crack initiation and propagation and may be the most indicative of the true other fracture of dental resin composites (Latta MA, 2005; Fujishima A and Ferracne JL,1996; Indrani DJ, et al, 1995). The aim of the present study, was to compare the fracture toughness of a microhybrid with a flowable microhybrid resin composites using a double-torsion technique test

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