THE EFFECT OF THERMOCYCLING AND MECHANICAL LOADING ON THE FRACTURE RESISTANCE OF ALL-CERAMIC AND HIGH PERFORMANCE POLYMERS FIXED PARTIAL DENTURES

Document Type : Original Article

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Lecturer of Fixed Prosthodontics, Delta University For Science and Technology

Abstract

Objectives: The purpose of this study was to evaluate the fracture resistance of the heat pressed ceramic (IPS e-max press) and the high performance polymers BioHPP anterior FPDs.
Materials and Methods A total number of 96 sound freshly extracted maxillary central incisors and canines were used in this study. The teeth were used to prepare a total of 48 three units FPD tested specimens. Specimens were used to test the fracture resistance of the materials under investigation without and after thermocycling and mechanical loading.
Results : The fracture load values of the IPS e-max specimens without TCML were ranged from 271.7 N to 206.01 N. While, after TCML the values were ranged from 171.6 N to 191.2 N. The fracture load values of the BioHPP specimens without TCML were ranged from 789.7 N to 665.1 N. While, after TCML the values were between 789.7 N and 615.4 N.
Conclusion: IPS e-max press FPDs had a lower fracture resistance than the BioHPP FPDs before and after TCML. The TCML decreased the resistance to fracture of both materials.

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