臨床をシミュレートした環境下でのNi-Tiファイルによる根管形成に与える臨床経験の影響

第1報 湾曲の少ない根管における根管形成所要時間と根管壁の評価

抄録

Abstract Objective : The purpose of this study was to examine the influence of operator experience on the quality of K-file hand instrumentation and nickel-titanium (Ni-Ti) file instrumentation in root canal preparation using a dental simulator.

 Materials and Methods : A total of 18 extracted human maxillary first premolars were selected and mounted to a manikin dental simulator. Operators having clinical experience of 1 or over 5 years were selected and each of them performed root canal preparation using K-files and Ni-Ti files (FKG Race). The working time of each root canal preparation was recorded, and a root canal surface of each sample was also observed with a scanning electron microscope.

 Results : When using K-files, the average working time and root canal surfaces prepared by operators with over 5 years of experience were better than those with only 1 year of experience. On the other hand, without relation to experience, averages of the working time and root canal surfaces prepared using Ni-Ti files were better than those prepared using K-files. There were no differences of the working time and root canal surfaces prepared using Ni-Ti files between the two groups.

 Conclusion : The systematic root canal preparation using Ni-Ti files resulted in relatively good performance without relation to experience under clinical simulation.