Analyses of the distal surface wear of canal in mesial roots of lower molars after the cervical preparation within different techniques

Introduction Difficulty during preparation is to make the instrument widen the canal and adapt to its shape without deformation Objective quantify the wear on distal walls after Gates Glidden and Reciproc cervical preparation Method 100 molars, totaling 200 canals divided into two groups: A - Gates Glidden and B - Reciproc files. Specimens cut 2 mm cervical level so that it could be replaced in its original position in a PVC trim. Images obtained before and after cervical preparation with a stereoscopic magnifier. Images were analyzed using Image J software and measurements performed at the lowest thickness of distal dentin before and after cervical preparation. Data analyzed through Cohen's d and Student's t-test with a significance level of 5%. Results MV roots thickness was similar at the beginning at the end of the study (d = 0.070), even with adjustment (d = 0.13). In the ML roots, the thicknesses were different at the beginning (d = 0.42) and at the end of the study (d = 0.39). However, with the adjustment, this difference disappeared (d = 0.05). Conclusion There was no statistical difference between dentin abrasion in mesial root zone risk of mandibular molars when instrumented by GG and Reciproc.