Comparative assessment of the quality of the marginal fit of lithium disilicate crownworks made by traditional and digital technologies

Abstract

This article presents an assessment of the quality of edge adhesion of cages of artificial crowns from disilicate lithium: 1) obtained with the help of CAD/CAM system from material E. max CAD; 2) obtained with the help of Cad/CAM system from ashless polymeric material C-Cast; 3) was produced using a 3D printer from ashless UV photopolymer material; 4) made by the traditional method of pressing, without the use of digital technologies. The Image J computer program was used to study the quality of the edge gap of artificial crown frames. For statistical analysis of the obtained data, the nonparametric H-Kruskel-Wallis test and the W-Mann-Whitney test were used. We found that the average value of the edge gap between the stump of the experimental model and the frames of artificial crowns made in CAD/CAM ARCTICA from the E. max CAD material is 18.20±2.30 microns, from the polymer material C-Cast 22.50±1.37 microns. The average value of the edge gap between the stump of the tooth and the frames of artificial crowns made using the 3D printer Asiga Max UV is 22.35±1.59 microns. The average value of the edge gap between the tooth stump and the frames of artificial crowns made by traditional pressing method is 101.40±11.55 microns. The results of our study indicate that the frames of artificial crowns made of lithium disilicate made with the help of modern digital technologies have a smaller edge gap compared to the frames of artificial crowns made by the traditional pressing method with a significance level of p<0,05 (h-Kruskel-Wallis criterion=30,865 p=0,0000009).