MICRO SCRATCH BEHAVIOUR OF LITHIUM DISILICATE GLASS CERAMIC AFTER GLAZING TREATMENT

Abstract

The purpose of this in vitro study was to investigate micro scratch behaviour of lithium disilicate glass ceramics (LDGC) - IPS e.max CAD, after glazing treatment. LDGC is one of most used all-ceramic dental system which provides high aesthetic quality and all patient requirements: function, biocompatibility and aesthetic. Micro-scratch test was performed with a progressive load of 0.01 to 30 N, which meant that the values of the normal force increased with the change of time. Rockwell C diamond cone was used as the indenter, of radius tip 100 μm. The aim of this study is to test the wear resistance of glazed lithium disilicate, to determine the thickness of the glaze and quantify the tribo-mechanical characteristics of the glazed layer. The obtained results are presented in the form of values of the critical loads (Lc), the friction coefficient (μ), the penetration depth (Pd) and the residual depth (Rd).