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
로도이 볼강, 조인호, 신수연,
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로도이 볼강 ( ) - 단국대학교
조인호 ( Cho In-Ho ) - 한국체육대학교
신수연 ( Shin Soo-Yeon ) - 단국대학교 치과대학 치과보철학교실
KMID : 0988720060220020111
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.
키워드
all ceramic;coping design;fracture strength;zirconia
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