ABSTRACT
Knowledge of the anatomical variations, particularly concerning the location and treatment of all canals is very important for the success of the endodontic therapy. Modifications in endodontic access and detection techniques, along with advancements in illumination and magnification technology, have aided in the location and treatment of extra canals in teeth. A case report is presented regarding a maxillary first molar with 5 root canals, two in mesiobuccal root , two in palatal root and one canal in distobuccal root located under Operating Microscope. The morphology is atypical because it is characterized by a single palatal root with 2 canals with separate orifices joining in the apical third. This report serves to remind clinicians that such anatomical variations should be taken into account during endodontic treatment of the maxillary molars.
ABSTRACT
19 cases with fractured instruments in root canals of posterior teeth were selected.The coronal 1-2 mm of the fractured instrument was exposed under microscope with ultrasonic technique.Irs instrument was used to clamp the end of the fractured instrument,then the fractured instrument was extracted.12 fractured instruments were removed by irs instrument successfully.The success rate was 63%,and the mean time consuming was 65 min.No root canal perforation happened.7 fractured instruments were removed by ultrasonic instruments,and the mean time consuming was 115 min.2 root canal perforations happened.The irs is an effective instrument for removal of separated instruments in root canals.