根尖止点的完整性与不同根管预备方法对直根管根尖封闭性的影响  

Effects of apical stop integrity and different root canal preparation techniques on apical sealing ability in straight root canals

作　　者：池学谦[1] 曹翠丽[2] 严晓燕 吴昊[1] 陈惠珍[1] 张金廷[1] 

机构地区：[1]河北医科大学第二医院口腔内科,050000 [2]河北医科大学基础所神经生物室 [3]河北省石家庄市维明医院口腔科

出　　处：《实用口腔医学杂志》2009年第2期226-229,共4页Journal of Practical Stomatology

基　　金：河北省科技厅攻关项目指导基金项目(编号:052761223);河北省卫生厅指导基金项目(编号:2005173)

摘　　要：目的:研究离体牙根尖止点的完整性和3种不同根管预备方法对根尖封闭能力的影响。方法:离体直单根管上前牙64个,其中60个采用两因素不同水平析因实验设计的原则随机分为6组(n=10),分别为:常规法根尖止点完整组(A1B1)、常规法根尖止点丧失组(A2B1)、G钻+常规法根尖止点完整组(A1B2)、G钻+常规法根尖止点丧失组(A2B2)、冠向下法根尖止点完整组(A1B3)、冠向下法根尖止点丧失组(A2B3),剩余4个随机平均分为阴性对照组和阳性对照组。所有根管均用冷牙胶侧方加压法充填,用染料渗透法评价各组根尖封闭能力。结果:根尖止点的完整性和根管预备方法都对直根管根尖封闭性有影响,并且二者有交互作用,但根管预备方法对根尖封闭性的影响较大。根尖止点丧失组较根尖止点完整组渗漏重,有显著性差异;常规法根管预备较冠向下法根管预备渗漏重,有显著性差异。结论:冠向下法根管预备和完整的根尖止点可提高根尖封闭性。Objective：To investigate the effects of apical stop integrity and three different root canal preparation techniques on apical sealing ability in straight root canals. Methods ：64 upper anterior extracted teeth with straight root canals were collected, 60 of them were randomly assigned to 6 groups（ n = 10） by 2 × 3 factorial design, GroupA1B1： stainless steel file conventional root canal preparation technique with apical stop; GroupA2B1 ： stainless steel file conventional root canal preparation technique without apical stop; GroupA1 B2： Gate-Glidden drill coronal preflaring ＋ stainless steel file conventional root canal preparation technique with apical stop; GroupA2B2： Gate-Glidden drill coronal preflaring ＋ stainless steel file conventional root canal preparation technique without apical stop; Group A1B3： PrnTaper for hand crown-clown technique with apical stop; Group A2B3： ProTaper for hand crown-down technique without apical stop. The other 4 samples were divided into two groups, negative control group and positive control group. All the prepared canals were obturated with cold lateral condensation. In order to evaluate the apical sealing ability, apical mieroleakage length was measured by dye penetration. Results：Apical stop integrity and different root canal preparation techniques have effect on apical sealing ability in straight root canals. There were interaction between the two factors. Root canal preparation technique has obvious effects on it. Microleakage of group A1 was fewer than that of group A2（ P 〈 0.05 ）. Microleakage of group B1 was larger than that of group B3 （ P 〈 0.05 ）. Conclusion ： Crown-down technique and integrity apical stop can increase apical sealing ability in straight root canals.

关 键 词：根尖止点 根管预备 根尖封闭性 染料渗透法 

分 类 号：R781.05[医药卫生—口腔医学]