Evaluation of canal preparation with Ni-Ti rotary files by micro computed tomography

Jeong-Ho Lee, Mi-Ja Kim, Chang-In Seok, Woo-Cheol Lee, Seung-Ho Baek
2004 The Journal of Korean Academy of Conservative Dentistry  
The purpose of this study was to compare the effects of preparation with GT files and profiles .04 in shaping of root canals and reconstruct the three-dimensional root canal system using micro computed tomography 40 canals of the extracted human mandibular molars were used, and randomly distributed into two experimental groups. In group 1, canals were prepared by GT files. In group 2, Profiles .04. were used. Apical preparation size was #30. For each tooth pre and post operative cross-sectional
more » ... ive cross-sectional images were obtained by the micro CT at 50 micron intervals. Pre and post operative cross-sectional images of 1, 2, 3, 5, and 8mm from the apex were compared. For each section, canal area and centering ratio were determined. For each tooth pre-and post-operative root canal volume from the furcation to the apex of the roots was calculated by three-dimensional image software. Following results were obtained: 1. At 8mm from the apex, area of dentin removed by GT rotary file was significantly larger than that by Profile .04.
doi:10.5395/jkacd.2004.29.4.378 fatcat:dnims7pfzvd7zcqr4j45xqvn3q