Home About us Editorial board Search Ahead of print Current issue Archives Submit article Instructions Subscribe Contacts Login 
Print this page Email this page Users Online: 413
Year : 2013  |  Volume : 1  |  Issue : 2  |  Page : 49-54

Effect of curvature angle and rotational speed on fracture of various Ni-Ti rotary files used in extracted molars

1 Department of Conservative Dentistry and Endodontics, Swami Devi Dyal Dental College and Hospital, Panchkula, Haryana, India
2 Department of Prosthodontics, Swami Devi Dyal Dental College and Hospital, Panchkula, Haryana, India

Correspondence Address:
Pardeep Khurana
1011/13, Civil Hospital Road, Shahabad (M), Kurukshetra - 136 135, Haryana
Login to access the Email id

Source of Support: None, Conflict of Interest: None

DOI: 10.4103/2321-4619.116033

Rights and Permissions

Objectives: The objective of this study was to evaluate the effect of rotational speed and angle of curvature in curved root canals on the fracture of different nickel-titanium rotary instruments that is Profiles, ProTaper, and K 3 files. Materials and Methods: Freshly extracted 180 human maxillary and mandibular molars were selected and divided into two groups of 90. Each group was then divided into three sub groups A, B, and C according to angle of curvature, Group I < 30° and Group II > 30°, which was measured by Schneider's method. Instrumentation was performed using the profile, ProTaper, and K3 (Company and in Literature name of Rotary file is K3) rotary instrument at 3 rotational speeds of 150, 250, and 350 rpm (10 molars at each rotational speed). Results: There were total of 32 instrument fractured out of 120 files. In a multivariable analysis, it was demonstrated that the rotational speed of 350 rpm fractured than those used at 150 rpm (odd's ratio [OR]: 3.6, 95% confidence interval [CI]: 1.3-10.5). An increase in the angle of curvature of the canal did not significantly increase the likelihood of fracture (OR: 1.9, 95% CI: 0.8-4.2). No significant differences were found between various designs of files used. Conclusion: Instrument fracture was associated with rotational speed and the angle of curvature.

Print this article     Email this article
 Next article
 Previous article
 Table of Contents

 Similar in PUBMED
   Search Pubmed for
   Search in Google Scholar for
 Related articles
 Citation Manager
 Access Statistics
 Reader Comments
 Email Alert *
 Add to My List *
 * Requires registration (Free)

 Article Access Statistics
    PDF Downloaded458    
    Comments [Add]    
    Cited by others 1    

Recommend this journal