The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)

The Korean Academy of Prosthodonitics (대한치과보철학회)
권호 표지

AN EVALUATION OF THE TIME-DEPENDENT DIMENSIONAL STABILITY OF ELASTOMERIC IMPRESSION MATERIALS

인상채득 후 시간경과에 따른 고무인상재의 체적변화

  • Lee Hong-Seok (Department of Prosthodontics, School of Dentistry, Chonbuk National University) ;
  • Cho Suck-Kyu (Department of Prosthodontics, School of Dentistry, Chonbuk National University) ;
  • Yoon Tae-Ho (Department of Prosthodontics, School of Dentistry, Chonbuk National University) ;
  • Park Ju-Mi (Department of Prosthodontics, School of Dentistry, Chonbuk National University) ;
  • Song Kwang-Yeob (Department of Prosthodontics, School of Dentistry, Chonbuk National University)
  • 이홍석 (전북대학교 치과대학 치과보철학교실) ;
  • 조석규 (전북대학교 치과대학 치과보철학교실) ;
  • 윤태호 (전북대학교 치과대학 치과보철학교실) ;
  • 박주미 (전북대학교 치과대학 치과보철학교실) ;
  • 송광엽 (전북대학교 치과대학 치과보철학교실)
  • Published : 2006.08.01
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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$\times$. 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.

Keywords

References

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