수종의 세멘트에 따른 주조금관의 유지력 및 세멘트 두계의 비교
Comparison for the retention of casting crown and cement thickness following various cements
이청희, 조광헌,
소속 상세정보
이청희 ( Lee Cheong-Hee ) - 경북대학교 치과대학 보철학교실
조광헌 ( Jo Kwang-Hun ) - 경북대학교 치과대학 보철학교실
KMID : 0362419940320010037
Abstract
The purpose of this study was to evaluate the effect of various cements on the retention of casting crown and the cement film thickness. To evaluate the retention of crown, thirty maxillary premolar were used and prepared to largely same dimension. According to the routine method, Non-precious metal crowns were made. The teeth and the metal crowns were divided into three groups and cemented under 5kg static pressure. Group I was composed of 10 teeth and 10 metal crowns and was cemented with zinc phohsphste cement. Group II was composed of 10 teeth and 10 metal crowns and was cemented with Panavia-EX cement. Group III was composed of 10 teeth and 10 metal crowns and was cemented with All-Bond & composite resin cement. After 5 days, the cemented specimens were mounted and the failure loads were measured by an Instron Universal Testing Machine. To evaluate the cement film thickness. 5 metal teeth and 5metal crowns from a prepared maxillary premolar were made. Two marks were drawed on the margin part of each surface at 4-surfaces of each specimen(one mark : crown, the other : metal tooth) and were width with SEM photograph(80 sheets) before and after cementation (Panavia-EX, All-Bond cement, & ZPC) was made. Difference of the widths of marks between before and after were measured, and differences from 4-surfaces of a specimen cemented with a cement were measured and calculated. @ES The results were as follows: @EN 1. There was a statistically significant difference between the failure loads of group III and the others(p<0.05). 2. There was a statistically significant difference between the cement film thickness of group III and the others(p<0.05).
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