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CAD/CAM을 이용하여 전부도재관의 지르코니아 코핑 디자인에 따른 파절강도에 관한 연구

A Study on the Frature Strength of All-Ceramic Crown according to the Zirconia Coping Design using CAD/CAM System

조인호|신수연|로도이 볼강
대한턱관절교합학회 (Korean academy of stomatognathic function and occlusion)|2006.06|구강회복응용과학지 (Journal of Dental Rehabilitation and Applied Science)|제22권 제2호|pp. 111-123

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Abstract

A Study on the Fracture Strength of All-Ceramic Crown according to the Zirconia Coping Design using CAD/CAM System L. Bulgan, In-Ho Cho, Soo-Yeon Shin Department of Prosthodontics, Graduate School, Dankook University The fracture strength of prosthesis is important, because it affects the function, and long term success of prosthesis and teeth. The purpose of this study was to compare the fracture strength of zirconia coping designs. Experimental test group were classified into three designs according to coping design, Modified design: Zirconia coping margin was located at 1mm above the axiogingival line angle. Collarless design: The coping margin terminated at the axiogingival line angle Butt design: The coping margin was extended to the finishing line of prepared margin. A Cercon(Degussa, Germany) CAD/CAM system was used to make the zirconia coping. Fracture strength was measured using loading machine at a cross head speed of 1mm/min. The results were statistically analyzed using the one-way ANOVA and multiple comparison test. Statistical significance was set in advance at the probability level of less than 0.05. The result : I. Collarless(738N±155N) and Modified(755N±185N) groups showed significantly a lower fracture strength than Butt(1057N±262N) group(p<0.05). II. There were no statistical differences of the fracture strength between Modified(755N±185N) and Collarless(738N±155N) groups. III. When comparing the fractured surface, all the group showed porcelain fracture, which were fractured at the labial surface of baked porcelain The butt design of the zirconia coping has higher fracture strength than modified and collarless design.

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