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Retreatment efficacy of hand versus automated instrumentation in oval‐shaped root canals: an ex vivo study
Author(s) -
Zmener O.,
Pameijer C. H.,
Banegas G.
Publication year - 2006
Publication title -
international endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.988
H-Index - 119
eISSN - 1365-2591
pISSN - 0143-2885
DOI - 10.1111/j.1365-2591.2006.01100.x
Subject(s) - ex vivo , instrumentation (computer programming) , in vivo , dentistry , root (linguistics) , biomedical engineering , materials science , orthodontics , medicine , biology , computer science , operating system , linguistics , philosophy , microbiology and biotechnology
Aim To compare the efficacy of hand versus automated instrumentation when retreating oval‐shaped root canals. Methodology Sixty human premolars with single oval canals were instrumented and filled with gutta‐percha and sealer and divided into three groups ( n = 20) – group 1: ProFile .04 taper rotary instruments; group 2: Anatomic Endodontic Technology (AET), and group 3: manual instrumentation with Hedström files. The teeth were split longitudinally and gutta‐percha/sealer remnants in the coronal, middle and apical thirds were assessed with light microscopy. The mean percentage of gutta‐percha/sealer remnants for each group was calculated and statistically analysed for significance using an anova repeated measures ( P < 0.001) and Tukey's multiple comparison test. The time required for retreatment was analysed using a one‐way anova and Tukey's test ( P < 0.001). Results Overall, 10–18% of the canal walls were covered with gutta‐percha/sealer remnants after preparation using any technique. Statistical analysis demonstrated that the mean values for remnants of filling material in the ProFile group were significantly higher than for the other groups ( P < 0.001), except in the apical third where no significant difference occurred. In all groups, the mean values in the middle third were higher than the coronal and apical thirds. The retreatment time for ProFile and AET was significantly shorter compared to manual instrumentation with Hedström files ( P < 0.001). Conclusions Under the experimental conditions, AET instruments and manual instrumentation with Hedström files resulted in cleaner canals. However, completely clean root canal walls were not produced with any of the techniques investigated.