Journal of Dental Rehabilitation and Applied Science (구강회복응용과학지)
- Volume 16 Issue 1
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- Pages.13-25
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- 2000
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- 2384-4353(pISSN)
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- 2384-4272(eISSN)
Marginal Fidelity and Fracture Strength of OPTIMAL PRESSABLE CERAMIC Crown according to Margin Types
OPTIMAL PRESSABLE CERAMIC 금관의 변연형태에 따른 변연적합도와 파절강도에 관한 연구
- Lee, Ju-Seog (Dept. of Prosthodontics Graduate School Dankook University) ;
- Kim, Ki-Suk (Dept. of Prosthodontics Graduate School Dankook University)
- Published : 2000.03.30
Abstract
Optimal Pressable Ceramic is one of the all-ceramic restorations with a shaded translucent pressed core and layering porcelains. The purpose of this study was to evaluate the marginal fidelity according to margin types and measurement sites, and to evaluate fracture strength according to margin types. Twenty seven OPC crowns made according to 3 types of cervical finishing lines were used in this study. Marginal gaps were measured before and after cementation. A Steromicroscope(SZ-ST(R), Olympus, Japan) was used to measure the space between the margin of OPC crown and the finishing line of metal model. Marginal gaps were measured at the labial, mesial, lingual and distal site, which were demonstrated in advance. Fracture strength testing was carried out using an Instron(Model M100EC, Mecmesin, England) at a cross head speed of 5 mm/min. All crowns were loaded until catastrophic failures occurred. The result were as follow: 1. In comparison according to variable margin before cementation, the marginal gap were increased in chamfer margin(
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