치과용 구강 스캐너와 모델 스캐너를 이용하여 제작된 보철물의 변연적합도

Abstract

The purpose of this study was to compare the marginal fit of the dental prosthesis with the oral scanner and the model scanner. The model(3-unit bridges) used urethane material on the chamfer margin. The urethane model was scanned with a oral scanner and a model scanner, and then designed with CAD software. Each test piece was made of a subtractive manufacturing and an additive manufacturing process. The marginal fit was measured using a replica technique. We analyzed the marginal opening(MO), the marginal gap(MG) of the maximum curvature area, the axial gap(AG), and the occlusal gap(OG) with a CCD camera mounted on a microscope. And then, the distance was measured using an image analysis software. In order to analyze the changes of the scanning method and the manufacturing method, two-way ANOVA was performed. For data of each parameter, a one-way ANOVA was conducted.BR Overall, the average value of the marginal fit was less than 169μm, and the average value of MO and AG was 79 μm or less. There was no difference in the mean values of MO and AG in the prosthesis milled by subtractive manufacturing with oral scanner and model scanner. MG, OG showed better fit of the prosthesis made by the oral scanner than the prosthesis manufactured by the model scanner.