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Polymerization shrinkage strain of seven current interocclusal recording materials

Title
Polymerization shrinkage strain of seven current interocclusal recording materials
Other Titles
교합 인기재의 중합수축 양상
Authors
전정현
Issue Date
2007
Department/Major
임상치의학대학원 임상치의학과보철수복치의학전공
Publisher
이화여자대학교 임상치의학대학원
Degree
Master
Abstract
이 논문의 목적은 교합 인기재 (5 polyvinylsiloxane, 1 polyether와 1 dimethacrylate)의 시간에 따른 중합 수축양상을 기록하고 1, 3, 5, 7, 10 분에 나타나는 체적 변화량을 비교 평가하는 것이다. 이 실험에 사용된 5개의 polyvinylsiloxane는 ImprintTM Bite (3M ESPE), Silagum Automix Bite (DMG), Blu-Mousse?Classic (Parkell), O-Bite (DMG)와 Exabite II (GC) 였으며, 1개의polyether는 Ramitec (3M ESPE)과 1개의 dimethacrylate는 Luxabite (DMG)였다. Bonded-disk method에 의해 LVDT (linear variable differential transformer)를 이용하여 재료 혼합 20초 후 10분까지shrinkage-strain (%)이 측정되었다. 모든 자료는 one-way ANOVA와 multiple comparison Scheffé test를 통해 분석되었으며, 유의수준은 p< 0.05였다. 초기 팽창을 보인 Luxabite를 제외한 표본들은 모두 급격한 수축을 나타냈다. 이후 10분간 shrinkage-strain은 증가하였으나 shrinkage rate는 점차적으로 감소하였다. Blu-Mousse?Classic, ImprintTM Bite와 Silagum Automix Bite가 10분 동안 나타낸 shrinkage-strain의 차이는 유의성이 없었다. Exabite II와 Luxabite는 가장 높은 shrinkage-strain (2.02 ~ 3.30 %)을 보였다. 전반적으로 Ramitec은 Exabite II를 제외한polyvinylsiloxane 재료 보다 높은 shrinkage-strain을 보였다. O-Bite는 3분 부터 가장 낮은 shrinakge-strain을 보였으며 기타 재료들과 유의한 차이는 5분부터 나타났다 (p < 0.05). 위 교합 인기재들은 서로 다른 중합수축 양상을 나타냈으며 각 제조사가 제시한 경화시간 경과 후에도 경미한 수축을 보였다.;Purpose. The purpose of this in vitro study was to investigate the polymerization shrinkage behavior and measure the polymerization shrinkage-strain of 5 polyvinylsiloxane (PVS), 1 polyether (PE) and 1 dimethacrylate (DM) -based interocclusal recording materials. Material and methods. The materials investigated in this study were 5 PVS-based materials: ImprintTM Bite (3M ESPE, Germany), Silagum Automix Bite (DMG, Germany), O-Bite (DMG, Germany), Blu-Mousse?Classic (Parkell, Inc., USA) and Exabite II (GC America Inc., USA); 1 PE-based material: Ramitec (3M ESPE, Germany); and 1 DM-based material: Luxabite (DMG, Germany). The polymerization shrinkage values of ten specimens for each material mentioned above were measured at 1, 3, 5, 7 and 10 minutes after mixing at 37 °C. Then, the amount of shrinkage-strain (%) was derived and all data were statistically analyzed by one-way ANOVA and the multiple comparison Scheffé test at the significance level of 0.05. Results. The representative shrinkage-strain kinetics graph showed that all specimens shrank immediately, except the Luxabite which expanded for the initial few seconds. After that, the shrinkage-strain increased in the magnitude up to 10 minutes, but its rate decreased gradually with time. During the measurements up to 10 minutes, the shrinkage-strain values presented by Blu-Mousse?Classic, ImprintTM Bite and Silagum Automix Bite were comparable to each other. Exabite II and Luxabite showed the highest values (2.02 ~ 3.30 %), significantly different from other materials all the time (p < 0.05). Generally, Ramitec presented higher shrinkage-strain values than PVS-based materials, except Exabite II. And O-Bite presented the lowest values of shrinkage-strain from 3 minutes, but they were significantly different from the other materials just from 5 minutes (p < 0.05). Conclusion. Within the limitations of this study, the materials investigated presented significantly different polymerization shrinkage-strain and showed dimensional changes even after the setting time indicated by respective manufacturers.
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