卒後研修歯科医師による湾曲根管の形成状態に関する研究

Since the pulp chamber, consisting of pulp ventricles and root canals, has a three-dimensionally complicated shape, diagnosis and operation for the endodontic treatment are often difficult. In the treatment of root canals, expansion and formation of curved root canals are difficult. To investigate the differences in the conditions after formation of curved root canals between the situations where their morphology can and cannot be directly observed, and to evaluate the differences in the morphology of the curved root canal formed between the degrees of curvature of the root canal, 5 dentists in the training course of the first year after graduation performed the formation of root canals using transparent models with different angles, and examined the conditions of the root canals formed. Results 1. At a root-tip angle of 10 and 20 degrees, the root canals formed under the condition where direct observation was possible were formed along their morphology, and those formed under the condition where direct observation was impossible were also formed almost along their morphology. 2. At a root-tip angle of 30 degrees, both root canals formed under the condition where direct observation was possible and impossible were formed along their morphology, but zip formation was observed in the root-tip area. 3. There were differences between the dentists in the positions of the apical seat and apical collar in the treatment of root canals at a curvature of 10 degrees. The individual differences increased with the treatment of root canals at a curvature of 20 degrees, which could not be directly observed. At a curvature of 30 degrees, zip formation was observed in the root-tip area, and flare and step formation was sometimes observed under the condition where direct observation was impossible.