Comparison of marginal fit of crowns made with direct scan of typodont preparation and plaster model

Abstract

Introduction. Technological development has allowed the emergence of digital dentistry, as in the case of dental scanners. Objective. To verify the existence of statistical differences in the marginal fit of digital crowns made with direct scanning of preparation on a typodont and of plaster models. Methodology. Quantitative, analytical and experimental laboratory approach, cross-sectional and prospective, involving 16 preparations for metalporcelain crowns made on acrylic teeth for typodont. Results. The scanning procedure was performed on a MEDIT i500 scanner, obtaining a first study group; subsequently, a plaster model scan was obtained to form a econd group. Both processes resulted in a total of 32 scanned preparations. The scan was performed 10 times in the typodont and the same number of timesin the plaster model; three measurements were obtained for each dental surface from each preparation. The non-parametric Mann-Whitney U test was used to compare the marginal fit of crowns. Under controlled conditions, scanning of the model obtained with analog impression was achieved, which did not show a statistically significant difference compared to direct scanning of dental preparations. Conclusion. There are many studies that agree with the results obtained, but several articles also show the superiority of digital impressions compared to analog ones, demonstrating the need to continue investigating under different conditions that influence the results with both scanning processes.