Abstract
The aim of the study is to evaluate the quality of the marginal gap of the frames of artificial crowns made with the use of CAD/CAM system and by casting method.
 Materials and methods. The article presents an assessment of the quality of the edge fitting of artificial crown frames made by means of CAD/CAM system KaVo ARCTICA on digital images of dentition created by intraoral laser scanner iTero Cadent and frames made of Co-Cr by the method of casting. The Image J computer program was used to study the quality of the marginal gap of artificial crown frames. For statistical analysis of the obtained data nonparametric Wilcoxon-Mann-Whitney test was used for the evaluation of the related samples.
 Results. We found that the average value of the marginal gap between the tooth stump of the experimental model and the frames of artificial crowns made in the KaVo ARCTICA Engine milling and grinding machine from the titanium blank Titan-Blank is 21.79 microns. The average value of the cement gap of the frames of artificial crowns made by the traditional casting method is 77.18 microns. The value of the marginal gap of artificial crown frames made by using the CAD/CAM system KaVo ARCTICA was 2.8 times less than the value of the marginal gap of frames made by the traditional casting method with a significance level of р 0.05 (V-Wilcoxon criterion for related samples = 0, р = 0.001).
 Conclusion. The results of our study indicate that the frames of artificial crowns made with the use of CAD/CAM system KaVo ARCTICA have a greater dimensional accuracy of the marginal gap compared to the frames of artificial crowns made by the traditional casting method.
Highlights
The article presents an assessment of the quality of the edge fitting of artificial crown frames made by means of CAD/CAM system KaVo ARCTICA on digital images of dentition created by intraoral laser scanner iTero Cadent and frames made of Co-Cr by the method of casting
We found that the average value of the marginal gap between the tooth stump of the experimental model and the frames of artificial crowns made in the KaVo ARCTICA Engine milling and grinding machine from the titanium blank Titan-Blank is 21.79 microns
The results of our study indicate that the frames of artificial crowns made with the use of CAD/CAM system KaVo ARCTICA have a greater dimensional accuracy of the marginal gap compared to the frames of artificial crowns made by the traditional casting method
Summary
For statistical analysis of the obtained data nonparametric Wilcoxon-Mann-Whitney test was used for the evaluation of the related samples. The average value of the cement gap of the frames of artificial crowns made by the traditional casting method is 77.18 microns. The value of the marginal gap of artificial crown frames made by using the CAD/CAM system KaVo ARCTICA was 2.8 times less than the value of the marginal gap of frames made by the traditional casting method with a significance level of р < 0.05 (V-Wilcoxon criterion for related samples = 0, р = 0.001). The results of our study indicate that the frames of artificial crowns made with the use of CAD/CAM system KaVo ARCTICA have a greater dimensional accuracy of the marginal gap compared to the frames of artificial crowns made by the traditional casting method. Цель исследования — изучить качество краевого прилегания каркасов искусственных коронок, изготовленных с помощью CAD/CAM-системы и методом литья
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