구강회복응용과학지 (Journal of Dental Rehabilitation and Applied Science)

  • 제23권3호
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  • Pages.239-248
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  • 2007
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  • 2384-4353(pISSN)
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  • 2384-4272(eISSN)
대한턱관절교합학회 (Korean Academy of Stomatognathic Function and Occlusion)
권호 표지

인상채득 후 시간경과와 반복주입에 따른 부가중합형 실리콘 인상재의 체적변화

Evaluation of the Time and Pouring Frequency Dependent Dimensional Stability of Additional Silicone Impression Materials.

  • 최미라 (한림대학교 의과대학 강동성심병원 보철과)
  • Choi, Mee-ra (Department of Prosthodontics, College of Medicine, Hallym University)
  • 발행 : 2007.09.30
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초록

The accuracy and dimensional stability of rubber impression materials are very important for the fitness of the final restoration. The purpose of this investigation was to evaluate the effects of the storage time and pouring frequency of the additional silicone materials on dimensional stability. Total 30 impressions were made of tooth prepared single crown. The dies had 1 buccolingual, 1 mesiodistal and 1 occlusogingival lines. Two additional silicone materials(examixfine, aquasil) were included. 15 specimens were made of each impression material and poured by type IV stone over times(1hour, 24hours, 72hours) after mixing. 5 impressions poured after 1 hour were used for second pouring after 24hours and third pouring after 72hours. The same examiner measured each specimen 3 times after lazer scanning. All statistical tests were performed with the level of significance set at 0.05. The results indicated that significant difference at any measuring point of stone dies except the buccolingual and mesiodistal lines of the specimen made at 1hour after mixing with examixfine when measurements at 1hour, 24hours and 72hours were campared. There were significant difference between two impression materials and at every measuring point of stone dies made at second and third pouring. The length of measuring point increased significantly as time passed by and increase of the pouring frequency. However, this results are clinically acceptable except the dies of the third pouring. Under the conditions of this study, the shrinkage rate of the additional silicone rubber impression materials significantly increased as time passed by and increase of the pouring frequency.

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