根管预备锥度对根管桩固位力的影响的实验研究  

Effects of endodontic instrument taper on post retention of central or lateral maxillary incisors in vitro

作　　者：安少锋[1] 凌均棨[1] 高燕[1] 

机构地区：[1]广州中山大学光华口腔医学院.附属口腔医院牙体牙髓科,510055

出　　处：《实用口腔医学杂志》2008年第4期510-513,共4页Journal of Practical Stomatology

基　　金：卫生部部属(管)医疗机构2004-2006年临床学科重点项目

摘　　要：目的：评价离体牙根管预备的不同锥度对根管桩固位力的影响。方法：成人离体上颌切牙40颗,随机分为4组,并按以下方法预备根管：A：SS（不锈钢手用k型锉）15-40#/0.02;B：PF（ProFile）OS3#/0.06＋PF25#/0.06;C：PFOS4#/0.07＋PF30#/0.06;D：PFOS5#/0.08＋PF35#/0.06。垂直加压法充填根管尖部5mm,直接法制作铸造镍铬合金根管桩,粘固48h后进行固位力的测试。结果：各组间的固位力均数不完全相同（P〈0.05）。A组与B组间的差异无显著性;A组与C、D组的差异均有显著性。结论：在一定锥度范围内,根管预备锥度的增大可增强根管桩的固位力。Objective .To evaluate the effects of various tapers of canal preparations on the retention of cast posts in endodontically treated upper incisors in vitro. Methods： Forty human central or lateral maxillary incisors were prepared by removing the clinical crown at 1 mm above the approximal CEJ and treated the canals with instruments of varying tapers. The groups comprising 10 teeth of each group were divided as follows： Taper 0.02 /15 -40#SS （ stainless steel K-files） with stepback technique as control, PF （ProFile） OS 3#/0.06 with taper 0.06/PF 25#/in apical third, PF OS 4#/0.07 with taper PF 0.06/30# in apical third, PF OS 5#/0.08 with PF taper 0.06/35# in apical third. Then, canals were filled with gutta percha and AH Plus sealer using vertical condensation technique with a level of 5 mm of gutta-percha left in the apical segment of the root. Metal cast posts were made by direct method and then the post was cemented with HY-BOND GLASIONMER CX （Shofu,Inc）cement. The roots were fixed in copper rings with mounting plaster and mounted on a WD-SA machine. The posts were subjected to gradually increasing vertical tensile force until dislodgment of the post occurred. Force （N） required to dislodge the post was obtained for each tooth, and the average force of the groups was compared using a one-way ANOVA and SNK multiple comparisons with SAS V8.1. Results： The highest resistance to dislodgment was obtained with PF OS 4#/0.07, whereas the lowest was obtained by the PF OS 3#/0.06. Nonstatistical difference was found between Taper 0.02/15 - 40# and PF OS 3#/0.06. PF OS 4#/0.07 was statistically superior to Taper 0.02/15 - 40# and PF OS 3#/0.06 but not PF OS 5#/0.08. Conclusion： The retention of posts is affected strongly with the increase in the diameter than with the increase in the taper angle. PF OS 4#/0.07 with taper PF 0.06/30# in apical third seems to be the best taper for maximal resistance to post dislodgment.

关 键 词：根管制备 锥度 根管桩固位 抗拉强度 

分 类 号：R783[医药卫生—口腔医学]