Comparative assessment of the quality of the marginal fit of lithium disilicate crownworks made by traditional and digital technologies
Zhulev E.N.1, VokulovaYu.A.2
1 Privolzhsky Research Medical University
603005, Russia, Nizhny Novgorod, pl. Minin and Pozharsky, d.10 / 1
2 Clinic No. 2 of the Federal customs service of Russia
603098, Russia, Nizhny Novgorod, Artel’naya Ulitsa, 2
Е-mail address: email@example.com
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). Keywords: digital prints, CAD/CAM systems, intraoral scanner, stereolithography, 3D printing, lithium disilicate, marginal fit, digital technologies in dentistry. For citation: Zhulev E.N., Vokulova Yu A. Comparative assessment of the quality of the marginal fit of lithium disilicate crownworks made by traditional and digital technologies. Stomatology for All / Int. Dental Review. 2020; No.3(92): 4-9 (In Russian). doi: 10.35556/idr-2020-3(92)4-9
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