sutton065

Click here for more information Abstract Introduction  This study aimed to evaluate the frequency of dentinal microcracks observed after root canal preparation with 2 reciprocating and a conventional fullsequence rotary system using micro–computed tomographic analysis. Methods Thirty mesial roots of mandibular molars presenting a type II Vertucci canal configuration were scanned at an isotropic resolution of 14.16 mm. The sample was randomly assigned to 3 experimental groups (n= 10) according to the system used for the root canal preparation: group A-Reciproc (VDW, Munich, Germany), group B-WaveOne (Dentsply Maillefer, Baillagues, Switzerland), and group C-BioRaCe (FKG Dentaire, La-Chaux-de-Fonds,Switzerland). Second and third scans were taken after the root canals were prepared with instruments sizes 25 and 40, respectively. Then, pre- and postoperative cross-section images of the roots (N= 65,340) were screened to identify the presence of dentinal defects. Results  Dentinal ...

Click here to download an editable Power Point file with all pictures and the movie Definition Radicular grooves (RGs) are a developmental groove in the root of teeth that may continue apically down the root. Grooves run from the beginning of the cemento-enamel junction (CEJ) and along the root surface to the apex. In most cases, the course of the grooves is straight. Localization Radicular grooves are often located on the palatal aspect of maxillary lateral incisors, and rarely on the labial root surface of the central incisors. RG were also reported in premolars and molars. According to their localization they are differentiated as distal, mesial and central patterns, with the distal position dominating, as it occurs in approximately 70% of cases. In the case of a distal localization, pathosis is often reported. The facial surface can be affected by the defect, albeit less frequently and with a predilection for the central maxillary incisors; however it is then properly termed a faci...