Evaluation of The Effect of Thermocycling on the Fracture Toughness and Impact Strength of Bio High Performance Polymer and Conventional Denture Base Resin Material : An In Vitro Study

Abstract

Aim: To carry out a comparative evaluation of the effect of thermocycling on the fracture toughness and impact strength of Bio High Performance Polymer and conventional heat cure resin.

Materials and methods: The study was carried out in four groups based on the manufacturing process of the sample: Group I (n = 8) control group containing specimens of BioHPP and PMMA before thermocycling; Group II (n = 8) test group of BioHPP and PMMA after thermocycling; The values for fracture toughess of each specimen were measured using a universal testing machine by a three-point bending test. Impact strength testing of the samples was done on the Izod impact testing machine.The mean values of the fracture toughness and impact strength were calculated by Mann-Whitney U test and Wilcoxon signed rank test are used for analysing the data.

Results: The statistical analysis shows that there was no significant difference in the fracture toughness and impact strength of BioHPP and PMMA before and after thermocycling. BioHPP has better mechanical properties than PMMA.

Conclusion: There is no significant effect on the mechanical properties of BioHPP and PMMA before and after thermocycling. Thus it concludes that both materials has clinical success and better longevity.