Abstract
O objetivo desse estudo foi avaliar utilizando a diafanização, a capacidade de limpeza das paredes de canais radiculares achatados preparados com três diferentes instrumentos. Foram selecionados 30 incisivos inferiores que após abertura coronária e odontometria tiveram os canais preenchidos com tinta nanquim, em seguida foram divididos aleatoriamente em três grupos de 10 dentes cada, de acordo com o instrumento utilizado no preparo: Grupo 1 – instrumentação com limas manuais; Grupo 2 – instrumentação com limas rotatórias ProTaper Universal; Grupo 3 – instrumentação com limas rotatórias iRace. Após a instrumenta- ção, os dentes foram diafanizados e avaliados quanto a capacidade de limpeza, analisando-se a quantidade de paredes dentinárias em que a tinta nanquim não foi removida. Ao se realizar o teste de Kruskal Wallis (p>0,05) não foram observadas diferenças estatisticamente significantes entre os grupos, quanto a média aritmética dos escores nos terços cervical, médio e apical. Nenhum dos instrumentos utilizados no preparo biomecânico de canais radiculares achatados foi capaz de realizar uma completa limpeza das paredes dentinárias.
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 India 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 (Dentsply-Maillefer-Ballaigues– Switzerland), ProTaper Universal rotary files (Dentsply Maillefer Instruments S.A.- Ballaigues - Switzerland) e iRaCe rotary files (FKG Dentaire S.A. – La-Cheaux-de Fonds – Switzerland)
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.[1,2]. Endodontists and dental material industries have, for a long time, concerned with creating systems that allow better root canal shaping, maintaining its original anatomy by means of an automated instrumentation, which facilitates biomechanical preparation.[4] Hand instrumentation, 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.[5]. The preparation of curved and flatenned root canals is more complex once the instrument suffers stresses and strains imposed by the procedure, which may influence root canal treatment outcome.[10]
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