Prevalência do canal médio-mesial em molares inferiores após execução da técnica do Troughing: um estudo ex vivo

Abstract

Objective: To evaluate ex vivo the prevalence of the middle mesial canal (MM) in first and second permanent mandibular molars after the troughing technique under microscopic magnification. Methods: The sample consisted 105 dental elements, which underwent the access cavity preparation and the chamber’s floor cleaning. Then root canals were detected in three steps. The initial location was performed under direct vision. In the second visualization an optical microscope was employed, with a magnification of 12X. If the MM canal was not observed, the troughing technique, with the use of ultrasonic tips, was executed between the mesiobuccal and mesiolingual canals with the aid of microscopic magnification in. Then, the last visualization was carried out with the help of the optical microscope in a 12X magnification. To verify the statistical difference in the prevalence of MM before and after troughing the McNemar test was used and the level of significance was 5%. Results: There was not a statistically significant increase in the prevalence of the MM canal when compared to the observations before (9.52 %) and after (12.38 %) the troughing using the optical microscope. However, the visualization with microscope and the execution of the troughing significantly increased the localization of the MM (12.38 %) canal when compared to the previous visualization without magnification (3.81 %). Conclusion: The execution of the troughing with the aid of the optical microscope consists of a minimally invasive technique, offers security in the clinical process and benefits the treatment of mandibular molars.