深冷冻保存对牛牙本质力学性能影响的生物力学研究  

Studies on the effect of cryopreservation on the biomechanical properties of bovine dentin

作　　者：郑秋林[1] 刘宏伟[1] 

机构地区：[1]同济大学口腔医学院,上海200072

出　　处：《牙体牙髓牙周病学杂志》2009年第7期390-392,共3页Chinese Journal of Conservative Dentistry

基　　金：国家自然科学基金(30772418);上海市科学技术委员会重点攻关项目(074119514)

摘　　要：目的:探讨不同温度不同时间深冷冻保存对牙本质力学性能的影响。方法:收集新鲜牛下颌中切牙70个,制成70个实性块状牙本质标本分7组,每组10个,A、B、C三组放在-196℃液氮中分别深冷冻保存1周、1月和6个月,D、E、F三组放在-80℃低温冰箱中分别深冷冻保存1周、1月和6个月,再与对照组G组一起测试标本的压缩强度、弹性模量、比例极限等力学性能。结果:不同温度不同时间深冷冻保存后牙本质压缩强度、弹性模量、比例极限没有明显差异。结论:深冷冻保存对牙本质的力学性能不产生影响。AIM： To investigate the effect of cryopreservation at different temperature and time on the bio- mechanical properties of bovine dentin. METHODS ： Seventy dentin specimens were obtained from 70 freshly extracted normal vital bovine teeth. Then they were divived into experimental group and control group. The dentin specimens in the experimental group were preserved in - 196℃ liquid nitrogen or deep freeze refrigerator for 1 week, 1 month and 6 months respectively. The compressive mechanical properties of each group （10 dentin specimens） were measured. RESULTS ： There was no significant difference in the compressive strength, elastic modulus and proportional limit with cryopreservation at different temperature and time. CONCLUSION： The tested mechanical properties of bovine dentin are not affected by cryopreservation.

关 键 词：牙本质 深冷冻保存 力学性能 

分 类 号：R780.2[医药卫生—口腔医学]