根管中折断器械特点的初步分析  

Analysis of separated instrument's characters in root canal preparation

作　　者：郭威[1] 吴友农[1] 富春枫[2] 

机构地区：[1]南京医科大学附属口腔医院口腔内科,南京210029 [2]南京医科大学公共卫生学院,南京210029

出　　处：《口腔医学》2006年第2期149-151,共3页Stomatology

摘　　要：目的 研究离体恒牙根管中两种器械折断的个数、长度、位置以及与器械号数、根管弯曲度间的关系。方法 将221颗离体牙共500个根管随机分为2组（各250个根管），一组使用K锉，一组使用H锉，依号码由小到大取1支插入根管后有提插阻力且不能超出根尖孔者为准，顺时针旋转，不冲洗根管，以10min为限．期间断者记为折断，反之记为未断，两组交替进行，用STATA 7．0软件对数据进行分析。结果 K锉组折断率为19．6％，H锉组为54．8％，两组间差异有显著性（P〈0．05）；折断长度以3mm～区间最多．两组间差异无显著性（P〉0．05），折断位置以根尖1／3处最多，两组间差异有显著性（P〈0．05）。结论 器械种类、根管弯曲度是影响器械折断的重要因素。Objective To evaluate the separated instrument＇s type, length, position, number of the instrument, curvature of the root canal and the relationship between them. Methods 221 extracted permanent teeth（500 root canals） were randomly divided into two groups（250 root canals each group）, and then one K or H-type hand file from small to large number was selected and inserted into the root canal until the file was seen at the apical foramen, and then clocked rotating it for 10 min. If it was broken, we recorded its time. If it was not broken, we put it aside. Then the analysis was processed with STATA 7.0 software. Results 49 were broken among 250 root canals in group K（ 19.6 % ）and 137 were broken among 250 root canals in group H（54.8 % ）, and there were statistical significances between them （ P 〈 0.05）. The lengths were all in 3 mm ～ , and there was no statistical significance between them （ P 〉 0.05）. The positions were all in apical 1/3, and there were statistical significances between them （ P 〈 0.05）. Conclusion The type of the instrument and curvature of root canals are the important factors to make them separated, and knowing all of these characters can help us remove the separated instruments successfully.

关 键 词：器械折断 根管预备 根管弯曲度 

分 类 号：R781.05[医药卫生—口腔医学]