Abstract
Objective: To evaluate, by diaphanization, the cleaning ability three different instruments on walls of flattened root canals. Methods: Thirty lower incisors, which had their root canals filled with India ink after coronal access and determination of the working length, were selected. The samples were randomly divided into three groups, of 10 teeth each, according to the instrument used during preparation: Group 1– hand files instrumentation; Group 2– instrumentation with ProTaper Universal rotary files; Group 3 – instrumentation with iRace rotary files. After instrumentation, the teeth were diaphanized and evaluated for cleaning ability, by analyzing the amount of dentin walls in which Indian ink was not removed. Results: When performing the Kruskal-Wallis test (p>0.05) there were not significant statistical differences between groups, as well as for the arithmetic average of the scores at cervical, middle and apical thirds. Conclusion: None of the instruments used for root canal preparation of flattened root canals was able to perform a complete cleaning of the dentin walls.
Highlights
Endodontic therapy aims at providing an adequate biomechanical root canal preparation and its airtight sealing with an inert material, by means of root filling
Given the importance of root canal cleaning and shaping for successful endodontic treatment, the present study aims to evaluate the presence of Indian ink in root canal walls after the diaphanization of extracted mandibular incisors, which had their root canals prepared by three different instruments: K-type hand files
The root canal cleaning was analyzed by observing the ink removal from dentin walls in each third by means of scores, and the lower the score, the better the cleaning of the root canal (Figures 1-3)
Summary
Endodontic therapy aims at providing an adequate biomechanical root canal preparation and its airtight sealing with an inert material, by means of root filling. To accomplish this goal, the root canal preparation stage is considered essential to the treatment success, once its purpose is the organic tissue removal, whether it is vital or necrotic, and the shaping in order to facilitate the filling materials introduction [1]. Chemo-mechanical root canal preparation is the stage that requires more time in endodontic treatment. Endodontists and dental material industries are concerned with the development of systems that allow better root canal shaping by means of an automated instrumentation, maintaining its original anatomy and facilitating the biomechanical preparation [3]. On the other hand, enables a higher incidence of iatrogenic complications during preparation, such as canal transportation, ledges, perforations, dentin compression and presence of fractured instruments [4]
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