Experimental analysis of wear of dental mills

Abstract

The paper presents experimental results regarding the main parameters that give information on the wear of the dental mills. The study of the phenomenon of wear of dental mills by experimental methods aims to highlight a multitude of parameters that influence the interaction between the dental mills and the material to be milled. It presents such a set of parameters that define the process and, based on the results, an eventual hierarchy of the influence of these parameters on the milling process is analyzed. The phenomenon of milling wear has been studied in various working regimes generated by the variation of the milling rotation speed and pressing force, measuring at equal time intervals of one hour the main parameters that can provide quantitative and qualitative information about the milling wear: the angle of sharpening, the angle of placement, the angle of clearance, the area of the circle at the tip of the tooth, the radius of the circle at the tip of the tooth in crosssection, the radius of curvature of the release channel, the mass of material lost by the body of the mill. Also, this paper briefly presents the general framework in which the experiments are performed, the milling cutters and the milled material, the working regime. After selecting the set of parameters in which the phenomenon is to be described, the variation of these parameters in relation to time is analyzed. Discussions and conclusions use graphical representations of the experimental data to configure statistical analysis, to develop a complete experimental plan to record any parameters that were not monitored in these early experiments, and also to suggest future statistical or deterministic models of the phenomenon. The deterministic mathematical modelling, towards which the material in this paper tries to orient the future researches, starts from the observation of a possible asymptotic damping of the aggressiveness of the dental mills towards the material and from the expression in terms of the theory of control systems. The mathematical models that are obtained starting from the structured experimental data and commented in this article will be used to investigate the possibilities of improving or optimizing the working regimes of the dental cutters. Both statistical and deterministic models will be used.