Abstract
The strain-energy-absorbing quality of ceramic biomaterials can be evaluated from plain strain fracture toughness measurement. This method was used to compare the mechanical properties of several commercial ceramic dental materials. Cylindrical specimens were produced from asreceived commercial feldspathic glass powders and tetrasilicic mica glass materials. The plain strain fracture toughness K Ic was evaluated by the Vickers indentation flaw method using a Tukon hardness tester. The dynamic Young's modulus parameter which was used to characterize the heating schedule of these materials was determined by means of a sonic method. The Student-Newman-Keuls rank test analysis for the mean fracture toughness values was able to separate these materials into several significant groups at the 0.99 level of confidence. The findings were compared with published data on similar feldspathic materials.
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