超声器械对尸体原位牙根尖倒预备的影响  

The effects of different ultrasonic retroprep tips on the root-end preparation in cadavers

作　　者：刘晓斌[1] 柏永刚[2] 

机构地区：[1]天津市口腔医院牙体牙髓科,300014 [2]南开大学医学院人体解剖学教研室

出　　处：《实用口腔医学杂志》2015年第2期241-244,共4页Journal of Practical Stomatology

摘　　要：目的:研究不同超声倒预备工作尖对尸体牙根尖倒预备的效果。方法:34颗双侧同名尸体前牙,暴露根尖约3 mm,常规开髓,根管预备、冲洗、热牙胶充填后,沿垂直牙体长轴方向切除根尖3 mm。按照配对原则分为2个实验组(n=15)和1个对照组(n=4)。实验组分别采用金刚砂和不锈钢2种不同超声工作尖进行倒预备,深度3 mm,对照组不做倒预备。扫描电镜下观察根尖断面微裂、边缘完整性以及牙胶清除情况。结果:金刚砂工作尖组微裂数量较不锈钢工作尖组少(P=0.059),对根尖破坏范围小(P=0.269),牙胶去除能力前者优于后者(P=0.006)。结论:金刚砂工作尖进行根尖倒预备效果较好。Objective： To evaluate the effects of different ultrasonic retroprep tips on the root-end preparation in cadavers. Methods： 34 anterior teeth in situ in maxillary and mandibular jaws in cadavers were chosen and the root-end of 3 mm of all teeth was exposed. Root canal was prepared and filled with gutta- purcha in all teeth, 3 mm of the root end was cut off. The teeth were divided into 2 treat- ment groups（ n = 15 ）, and 1 control group（ n =4）. The root-end preparation was made using ultrasonic diamond tip and stainless steel tip respectively to 3 mm depth. The teeth in control group were not treated. Microcracks, marginal integrity and gutta-percha clearance were observated under SEM. Results： Diamond ultrasonic tips provoked a smaller number of cracks（P = 0. 059） and destroy of margin- al integrity（P = 0.269） than stainless steel tips. Less gutta-percha clearance was produced by stainless steel tip than that by diamond ultrasonic tip（P = 0. 006）. Conclusion： Diamond ultrasonic tip is more suitable for root-end preparation.

关 键 词：根尖倒预备 超声倒预备器械 根尖手术 

分 类 号：R782[医药卫生—口腔医学]