活髓牙本质与无髓牙本质的力学性能比较  

Comparison of mechanical properties between vital dentine and pulpless dentine

作　　者：郑庄[1] 唐亮[2] 黎明庆[3] 

机构地区：[1]广东省口腔医院,510280 [2]暨南大学医学院口腔系 [3]暨南大学理工学院

出　　处：《实用口腔医学杂志》2006年第6期755-758,共4页Journal of Practical Stomatology

基　　金：广东省自然科学基金资助(编号:31912)

摘　　要：目的:测试人类牙本质的力学性能,比较活髓牙本质与根管治疗过的无髓牙本质的力学性能是否有差异。方法:收集20颗活髓牙和9颗根管治疗过的无髓牙,将牙本质磨制成实性块状标本,置于9g/L生理盐水中。采用位移法测试其压缩力学性能,所得数据均采用独立样本t检验。结果:活髓牙本质的弹性模量为(15.77±1.52)GPa,比例极限为(157.07±13.79)MPa,压缩强度为(257.67±10.23)MPa;无髓牙本质弹性模量为(12.08±1.71)GPa,比例极限为(144.30±9.76)MPa,压缩强度为(235.26±9.12)MPa。活髓牙本质的力学性能明显强于无髓牙本质(P<0.05)。结论:标本的制备对测试结果影响较大;活髓牙本质的力学性能明显强于无髓牙本质,与临床观察结果相符。Objectives：To study the mechanical properties of human dentin obtained from vital and pulpless teeth. Methods： Dentin specimens were obtained frnm 20 freshly extracted normal vital human teeth and 9 endodontically treated human pulpless teeth. The dentin was grinded to be rectangular specimens along to the longitudinal axes of the teeth. All the specimens were immerged in 9 g/L sodium chloride solution, their compressive mechanical properties were measured with displacement measurement method. All data obtained were analyzed with t tests. Results： The elastic moduli,proportional limits and compressive strengths of the dentin samples from vital teeth were （ 15.77 ± 1.52） GPa, （157.07± 13.79） MPa and （257.67 ± 10.23） MPa respectively. Those from pulpless teeth were （ 12.08 ± 1.71 ） GPa, （ 144.30 ± 9.76） MPa and （235.26 ± 9. 12 ） MPa respectively （P 〈 0.05, vital dentine vs pulpless dentine）. Conclusions： The mechanical properties of dentin from vital teeth are stronger than those of the pulpless teeth.

关 键 词：牙本质 力学性能 弹性模量 比例极限 压缩强度 

分 类 号：R781.05[医药卫生—口腔医学]