Jayasenthil Athikesavan, Sathish Emmanuel Solomon, Prakash Prashanth
Department of Conservative Dentistry and Endodontics, Tagore Dental College and Hospital, Rathinamangalam, Vandalur, Chennai 600048, India.
ISRN Dent. 2012;2012:208241. doi: 10.5402/2012/208241. Epub 2012 Sep 10.
Objective. The objective of this study was to evaluate the efficacy of two retreatment NiTi systems (protaper universal retreatment files, R-Endo), when compared to manual technique in removing Gutta-percha obturated with two sealers. Study Design. Sixty extracted single-rooted premolars were instrumented with Protaper rotary files till F3. The specimens were divided into six groups. Groups 1, 2, 3 were obturated with Gutta-percha and zinc oxide eugenol and Groups 4, 5, 6 were obturated with Gutta-percha and AH-plus. The retreatment was carried out in groups 1 and 4 with H-files and GGdrills, groups 2 and 5 with R-endo retreatment files and groups 3 and 6 with Protaper retreatment files. The roots were sectioned and evaluated under optical stereomicroscope. Statistical analysis was performed with one-way ANOVA and Newman-Keul's test at P < 0.05. Results. The manual technique resulted in cleaner canal walls when compared with both rotary retreatment systems. Conclusion. NiTi rotary retreatment files can be used to remove the filling material quickly, but it should be followed by hand instruments to obtain better canal wall cleanliness.
目的。本研究的目的是评估两种再治疗镍钛系统（ProTaper Universal再治疗锉，R-Endo）与手工技术相比，在去除用两种封闭剂充填的牙胶时的效果。研究设计。60颗拔除的单根前磨牙用ProTaper旋转锉预备至F3。标本分为六组。第1、2、3组用牙胶和氧化锌丁香油封闭，第4、5、6组用牙胶和AH-plus封闭。第1组和第4组用H锉和GG钻进行再治疗，第2组和第5组用R-Endo再治疗锉，第3组和第6组用ProTaper再治疗锉。将牙根切片并在光学体视显微镜下评估。采用单因素方差分析和Newman-Keul检验进行统计学分析，P<0.05。结果。与两种旋转再治疗系统相比，手工技术使根管壁更清洁。结论。镍钛旋转再治疗锉可用于快速去除充填材料，但之后应使用手动器械以获得更好的根管壁清洁度。
