根尖预备尺寸对玷污层清除效果的比较研究  

Effectiveness of Apical Preparation Size on the Removal of Smear Layer

作　　者：苗晖[1] 郭香君 陈敏[1] 吴丽更[1] 

机构地区：[1]天津医科大学口腔医院牙体牙髓科,天津300070

出　　处：《口腔医学研究》2015年第2期160-162,166,共4页Journal of Oral Science Research

基　　金：天津市卫生局科技基金课题(2010KZ102)

摘　　要：目的:比较5种不同根尖预备方案对根管玷污层的清除效果。方法:将50颗单根管上颌离体前牙随机分为5组,A组:采用机动ProTaper系统将根尖预备至25#(F2),配合次氯酸钠+EDTA冲洗;B组:根尖预备至30#(F3),预备及冲洗方法同A组;C组:采用机动ProTaper系统将根尖预备至F3,后用不锈钢K锉预备根尖至35#,冲洗同A组;D组:采用机动ProTaper系统将根尖预备至F3,后用不锈钢K锉预备根尖至40#,冲洗同A组;E组:根管预备同D组,冲洗用蒸馏水。利用热场发射扫描电子显微镜,评估玷污层清除情况。结果:B组、C组和D组均明显优于A组(P<0.05);A组、B组、C组和D组明显优于对照E组(P<0.05)。结论:机动ProTaper将根管预备至30#,可使足量的冲洗液渗入根尖1/3区,有效去除玷污层及碎屑。Objective： To compare the effect of five different apical preparation protocols in smear layer removal. Methods： Fifty extracted single--rooted maxillary anterior teeth were randomly divided into five groups,group A： root canals were prepared to 25# （F2） by ProTaper system,and irrigated by NaOCl and EDTA; group B： root canals were prepared to 30# （F3）,and the preparation and irrigation protocols were same as group A; group C： root canals were prepared to 30# （F3） by ProTaper system,and then the apical size enlarged to 35# by stainless steel K- file. The irrigation protocol was same as group A; group D： root canals were prepared to 30# （F3） by ProTaper system,and then the apical size enlarged to 40# by stainless steel K-file. The irrigation protocol was same as group A; group E： root canal preparation was same as group D,and irrigated by distilled water. The samples were examined under a thermal field emission scanning electron microscope. Results： Group B,group C and group D showed lower scores than group A （P〈0.05） ; group A,group B,group C and group D showed lower scores than group E （P〈 0.05）. Conclusion： In smear layer remova!,the minimum instrumentation for proper penetration of irrigants to the apical third of the canal is a 30# file by ProTaper system.

关 键 词：根尖预备尺寸 根管冲洗 根管预备 次氯酸钠 玷污层 

分 类 号：R781.05[医药卫生—口腔医学]