A comparison of the quality of dental crowns from TI-6AL-4V and CoCr alloys made with slm technology

Abstract

© 2018, Czech Medical Association J.E. Purkyne. All rights reserved. At present, dental replacements are more and more often being made with the use of additive manufacturing. In dentistry, selective laser melting (SLM), which enables the manufacturing of dental replacements from the alloys CoCr and Ti-6Al-4V, is the technology most used. With comparable costs for production, Ti-6Al-4V has significantly better biocompatibility, better mechanical properties and lower weight in comparison with an alloy from CoCr. The goal of the submitted study is a comparison of the production precision of dental crowns from CoCr alloy and Ti-6Al-4V alloy manufactured on a Mlab cusing R machine. For purposes of the study 30 crowns were manufactured from CoCr alloy and 30 from Ti-6Al-4V alloy on a Mlab cusing R machine, with the settings recommended by the manufacturer. After production the crowns were scanned using a Medit Identica dental scanner. The obtained data were subsequently modified and compared with a nominal CAD model in the Volume Graphics VGStudioMAX 2.2 software. The results are deviations on the level of 95% of coverage of the compared work with nominal geometry for all evaluated groups. The obtained deviations were subsequently processed statistically for the purpose of determining the statistical significance of the difference between the materials.