摘要
目的:检测纳米树脂直接修复离体切牙切角缺损后牙齿的整体抗折性能。方法:搜集30颗完整离体中切牙,分为A、B、C 3组,每组10颗。A、B 2组为实验组,对实验组离体切牙用磨除法制备近中切角缺损模型。对缺损模型进行根管治疗及牙体预备,2组皆预备唇侧贴面及舌侧鸠尾,对A组切缘进行2 mm磨除。用纳米树脂对2组牙齿进行分层分色直接充填修复,完成抗折试件的制备。C组作为对照组,不进行任何处理。冷热循环2 000次试验后以万能材料试验机检测试件的断裂载荷,观察断裂模式,将3组结果进行对比。结果:A,B,C 3组的平均断裂载荷分别为(466.93±171.68)N,(444.5±173.00)N及(474.77±97.55)N(P>0.05)。30个试件中,仅对照组中发生1个不利断裂。结论:纳米树脂直接修复离体切牙切角缺损后与天然牙的抗折性能相近,断裂模式皆为有利断裂。切端磨除不影响整体抗折性能。
Objective： To study the fracture resistance of nanofilled composite resin restoration for the treatment of incisally fractured in- cisors. Methods： 30 extracted permanent maxillary central incisors were randomly divided into A, B and C groups （n = 10）. In group A and B, the teeth were cut obliquely from the mesial incisal angle. Labial reduction of 0.5 mm for veneer and dovetails in the lingual surfaces were prepared. In group A, additional 2mm of the incisal edge were cut horizontally. The teeth were restored with nanofilled com- posite resin. The samples in group C were unprepared as the controls. The specimens were stored in artificial saliva and underwent 2 000 cycles of thermal cycling test. Fracture resistance of the teeth was measured by ~ test machine and the fracture mode was observed. Re- suits： The mean fracture load（N） of group A, B and C was 466.93 ＋ 171.68,444.5 ＋ 173.00 and 474.77 ~ 97.55 respectively（P 〉 0. 05）. All fractures in the 2 test groups but 1 in the control group were in a favorable way. Conclusion： Incisally fractured incisors restored with nanofilled composite resins can achieve the fracture resistance similar to that of intact natural tooth. Failure modes of the restored teeth are in favorable way. Additional cut of 2 mm of the incisal edge dose not affect the fracture resistance of the restored teeth.
出处
《实用口腔医学杂志》
CAS
CSCD
北大核心
2016年第6期830-833,共4页
Journal of Practical Stomatology
基金
陕西省科技攻关项目(编号:2012K16-07-03)
关键词
切角缺损
纳米树脂
断裂载荷
断裂模式
Incisor fracture
Nanofilled composite resins
Fracture resistance
Failure mode
作者简介
通讯作者：蒋月桂E-mail：jyg_xjtu@163．com
