Three-dimensional Analysis of the Shaping Characteristics and Ability of a Novel Ni-Ti Rotary File

抄録

 Purpose: To compare the shaping characteristics and ability of the JIZAI (JZ) Ni-Ti rotary file to two other Ni-Ti files that have a similar operating environment to JZ, HyFlex CM (HCM) and ProTaper Next (PTN).

 Methods: Root canal preparation was performed in a J-shaped canal model using the three file systems (n＝4), and dental cone-beam computed tomography (CBCT) was performed. The three-dimensional images were superimposed before and after instrumentation at the same position. The X-, Y-, and Z-axes were set 1 mm coronal to the root apex, and the cross-sectional morphology, the extent of transportation, and the volume of the shaped root canal wall were evaluated.

 Results: The cross-sectional morphology of the root canal was round, similar to the original root canal morphology with JZ and PTN. The HCM showed an elliptical tendency toward the sagittal direction. The transportation was relatively larger with JZ and smaller with HCM, with no significant difference between the files. The shaped root canal wall volume was greatest with HCM and least with JZ, with no significant difference between the files.

 Conclusion: JIZAI had equivalent shaping ability to HyFlex CM and ProTaper Next in terms of transportation and shaped root canal wall volume, and therefore might be useful for safe preparation of root canals.