Journal of Research and Advancement in Dentistry
Official publication of Magadh University and Kolhan University, Government of Bihar and Jharkhand, India
Official publication of Magadh University and Kolhan University, Government of Bihar and Jharkhand, India
Year : 2016
Volume : Volume 6
Issue : Issue 1s
Address for correspondence :
Dr. Akash Azad
akash.azad@yahoo.com
Background: The purpose of this in vitro study is to compare the shaping ability of ProTaper Next (PTN) and Twisted Nickel (TF) Titanium rotary instruments in the maxillary and mandibular first and second molars with curvature of 25 to 90 degrees using digital radiography. Materials and Method: Forty maxillary and mandibular first and second molars extracted for orthodontic or periodontal reasons were selected. The crown of each tooth was removed at the level of the CEJ using a diamond disc. A #10 stainless steel K-type hand file was kept at the working length and digital radiographs were taken for each specimen. The root canals were then divided in two groups: Group A- PTN and Group B- TF, the root canals were instrumented by these systems to their full length according to the manufacturer’s instructions. Postoperative radiographs were taken with the last file used inside the root canals. The digital radiographs were enhanced The angle and radius of the root canal curvature were determined according to Pruett’s method using the software Scion Image and the distance between these two central axes at working length was measured. Dentine removal was measured at five reference points. Results: The analysis of removed dentine showed that both the titanium rotary instruments cut uniformly at all the reference points. The instrumentation symmetry indicated that both systems maintained the original curvature of the root canal. The mean loss of working length was 0.495+0.437 mm for PTN and 0.435+0.267 mm for TF. The mean apical transportation for PTN was 0.343mm for TF was 0.252mm, the difference between these values were not significant. Conclusions: Within the limitations of this study, it can be concluded that although both the system are based on different principles, PTN and TF were statistically equal in shaping curved canals and they respected the original canal anatomy, without any aberrations or failures.
Keywords: Shaping ability, Nickel Titanium, Twisted file, Protaper Next, NiTi Rotary file system.
