Study of Clogging of the Working Part Dental Rotary Cutting Tool with Modified Metal Bond

Purpose of research. Tooth surface treatment is an integral part of the dentist's job. Every day, specialists of a dental office are faced with clinical cases that involve the preparation or grinding of the tooth surface, the processing of filling material or a crown. In the process of cutting, abrasive tools are subjected to periodic and continuous power, thermal and physical-chemical influences, as a result of which their working surfaces wear out. This can be due to various reasons.

According to the literature data, the morphology of the working part of the tool, the inter-diamond space, and the high temperature during friction during the cutting process, to a greater extent affect the salting of the tool. The purpose of the work is to provide analytical proof of the effectiveness of a method for manufacturing a rotating abrasive cutting tool (VR) with a modified metal bond, which makes it possible to reduce the filling density of its working section and increase the inter-diamond space, which will lead to minimization of salting. This will ensure an increase in the VRI resource and the quality of preparation.

Methods. The article discusses a method for reducing the salinity of a galvanic diamond tool due to the additional introduction of diamond powder into the metal bunch of burs, the size of which is 30-50% of the size of the working diamond, i.e. creating a hybrid dental rotary instrument. In the course of the study, a comparative analysis of the salinization of standard and hybrid burs by the method of cutting - 2mm thick plates made of fiberglass of the SF-1-50 brand (microhardness 62HV) was carried out. The salinity Ams was determined as the difference in mass between the mass of the tool after cutting and the final mass. The test was carried out on a stand, which allows simulating the real conditions of loading and wear of the VRI, by drilling the plates with a radial feed of bora with a bur speed of 5000 rpm with a force of 4 N. The surface relief of the working part was determined microscopically. The assessment of the chemical composition of the VRI working section before and after tribological tests was carried out using an OXFORD energy dispersive microanalysis attachment of the TM3030 microscope.

Results. The positive effect of the proposed method is experimentally confirmed by the results of comparative tests for determining the salinity and cutting temperature of a standard and modified diamond dental rotating instrument.

Conclusion. An analytical evaluation of the modified tool showed a significant performance advantage over a standard bur due to minimization of the contamination of the working part of the tool.

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