Friction and wear performance on ultrasonic vibration assisted grinding dental zirconia ceramics against natural tooth

Abstract

In order to further demonstrate the advantages and application prospects of ultrasonic vibration assisted grinding (UVAG) in ceramic dental restorations, this paper focused on friction and wear performance of the machined surfaces by UVAG and diamond grinding (DG) against natural teeth. Firstly, 3D roughness parameters, such as $$S_{sk}$$ , $$S_{ku}$$ (height parameters, in ISO 25178-2), $$S_{tr}$$ (spatial parameter, in ISO 25178-2), and $$S_{vi}$$ , $$S_{ci}$$ (function parameters, in the Birmingham set of 14 parameters), were selected to characterize the surfaces machined by UVAG and DG. Secondly, the effects of machine parameters on 3D roughness parameters for two processing methods were discussed. Lastly, friction and wear experiments between sintered zirconia ceramics and natural teeth were conducted. It illuminated the effect mechanism of ultrasonic vibration and machine parameters on friction coefficients and wear loss. The results showed that the assistance of ultrasonic vibration could not only reduce friction coefficients (from 0.80 to 10.09 %), but also decrease the longitudinal wear depth of natural teeth. Besides, the teeth wear loss changed with the variation of spindle speed in the case of ultrasonic vibration assisted grinding.