인상채득 후 시간경과에 따른 고무인상재의 체적변화
AN EVALUATION OF THE TIME-DEPENDENT DIMENSIONAL STABILITY OF ELASTOMERIC IMPRESSION MATERIALS
이홍석, 박주미, 송광엽, 조석규, 윤태호,
소속 상세정보
이홍석 ( Lee Hong-Seok ) - 전북대학교 치과대학 치과보철학교실
박주미 ( Park Ju-Mi ) - 전북대학교 치과대학 치과보철학교실 및 구강생체과학연구소
송광엽 ( Song Kwang-Yeob ) - 전북대학교 치과대학 치과보철학교실 및 구강생체과학연구소
조석규 ( Cho Suck-Kyu ) - 전북대학교 치과대학 치과보철학교실 및 구강생체과학연구소
윤태호 ( Yoon Tae-Ho ) - 전북대학교 치과대학 치과보철학교실
KMID : 0362420060440040363
Abstract
Statement of Problem : The accuracy and dimensional stability of elastomeric impression materials have been the subject of numerous investigation. Few studies have addressed the effect of changes in time on the dimensional stability of impression materials.
Purpose: The purpose of this investigation was to evaluate the effects of elastomeric impression materials and storage time on dimensional stability.
Materials and methods: A total of 75 impressions were made of epoxy resin dies mimicked prepared 3-unit fixed partial denture. The dies had 1 buccolingual, 1 mesiodistal and 1 occlusogingival lines and interpreped dot. Impression materials investigated included two polyether impression materials and three polyvinylsiloxane impression material. 15 specimens were made of each impression material and poured by type IV stone over times (30 minutes, 24 hours, 72 hours) after mixing; the same examiner measured each specimen 3 times at a magnification of 3.5×. All statistical tests were performed with the level of significance set at .05.
Results : The results indicated that significant difference at any measuring point of stone dies of the polyether impression materials and when measurements at 30 minutes, 24 hours, and 72 hours were compared ; the length of measuring point increased significantly as time passed by. However this result is not significant clinically. Analysis also showed significant differences at any measuring point when polyvinylsiloxane and polyether impression materials were compared and significant differences clinically.
Conclusion: Under the conditions of this study, the shrinkage rate of the polyvinylsiloxane and polyether impression materials significantly increased as time passed by. The polyether impression materials showed higher shrinkage significantly, while the shrinkage rate of all five materials showed a significant time-dependent increase.
키워드
Impression material;Polyether;Polyvinylsiloxane;Time;Dimension
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