CAJ | 학술논문

目的研究石膏模型材料抗折强度与脱模时间的关系方法采用同一主模型，选用3种石膏模型材料，按照产品要求的水粉比例，在其他条件相同时进行灌注模型。分别在0.5 h、1 h、6 h和16 h 4个时间段，测定模型被测基牙部分的抗折强度并进行统计学分析。结果采用单因素方差分析和Newman-Keuls方法进行均数比较，取α=0.05，n=12，3种材料的石膏模型在不同时间组之间的抗折强度差异存在显著性。结论建议普通石膏应在1 h以后分离模型，最佳脱模时间应在16 h以后；硬石膏应在6 h以后分离模型，最佳脱模时间应在16 h以后；超硬石膏应在6 h以后分离模型，最佳脱模时间应在6 h以后。
목적연구석고모형재료항절강도여탈모시간적관계방법채용동일주모형，선용3충석고모형재료，안조산품요구적수분비례，재기타조건상동시진행관주모형。분별재0.5 h、1 h、6 h화16 h 4개시간단，측정모형피측기아부분적항절강도병진행통계학분석。결과채용단인소방차분석화Newman-Keuls방법진행균수비교，취α=0.05，n=12，3충재료적석고모형재불동시간조지간적항절강도차이존재현저성。결론건의보통석고응재1 h이후분리모형，최가탈모시간응재16 h이후；경석고응재6 h이후분리모형，최가탈모시간응재16 h이후；초경석고응재6 h이후분리모형，최가탈모시간응재6 h이후。
Objective　To evaluate the fracture resistance of three types die stone materials at different time intervals. Methods　Maxillary master casts were made of ploymerized methyl methacrylate resins. Three types die stone materials were used. A total of 144 casts were prepared, separated and tested on the self-made testing machine at 0.5, 1,6 and 16 hours to measure the resistance to fracture. Results　The data were analyzed with ANOVA at α=0.05 and n=12. Results showed that the cast fracture strength was affected by cast material and setting time obviously. Conclusion　It is recommended that the cast setting time should be 6-16 hours.