Author/Authors :
Honardar, Kiamars Department of Endodontics - School of Dentistry, Shahed University, Tehran , Assadian, Hadi Department of Endodontics - School of Dentistry, Shahed University, Tehran , Shahab, Shahriar Department of Oral and Maxillofacial Radiology - School of Dentistry, Shahed University, Tehran , Jafari, Zahra Department of Endodontics - School of Dentistry, Shiraz University of Medical Sciences, Shiraz , Kazemi, Ali Department of Endodontics - School of Dentistry, Shahed University, Tehran , Nazarimoghaddam, Kiumars Department of Endodontics - School of Dentistry, Shahed University, Tehran , Kharrazifard, Mohammad Javad Tehran University of Medical Sciences, Tehran , Labbaf, Hossein Department of Endodontics - School of Dentistry, Shahed University, Tehran
Abstract :
Objective: Use of rotary Nickel-Titanium (NiTi) instruments for endodontic preparation has introduced a new era in endodontic practice, but this issue has undergone dramatic modifications in order to achieve improved shaping abilities. Cone-beam computed tomo- graphy (CBCT) has made it possible to accurately evaluate geometrical changes following canal preparation.
This study was carried out to compare canal centering ability and transportation of Twisted File and BioRaCe rotary systems by means of cone-beam computed tomography. Materials and Methods: Thirty root canals from freshly extracted mandibular and maxil- lary teeth were selected. Teeth were mounted and scanned before and after preparation by CBCT at different apical levels. Specimens were divided into 2 groups of 15. In the first group Twisted File and in the second, BioRaCe was used for canal preparation. Canal transportation and centering ability after preparation were assessed by NNT Viewer and
Photoshop CS4 software. Statistical analysis was performed using t-test and two-way ANOVA.
Results: All samples showed deviations from the original axes of the canals. No significant differences were detected between the two rotary NiTi instruments for canal centering abili- ty in all sections. Regarding canal transportation however, a significant difference was seen in the BioRaCe group at 7.5mm from the apex.
Conclusion: Under the conditions of this in vitro study, Twisted File and BioRaCe rotary NiTi files retained original canal geometry
Keywords :
Centering Ability , CBCT , Cone-Beam Computed Tomography Canal Instrumentation , Ni-Ti rotary systems , Tportatiranson
