Journal of Conservative Dentistry

ORIGINAL ARTICLE
Year
: 2013  |  Volume : 16  |  Issue : 5  |  Page : 399--403

Working length changes in curved canals after coronal flaring by using rotary files and hand file: An in vitro study


Rahul Kumar1, Neha Khambete2, Suvarna Patil3, Upendra Hoshing3, Ashish Medha3, Roshan Shetty1 
1 Department of Conservative Dentistry and Endodontics, Mahatma Gandhi Mission's Dental College and Hospital, Navi Mumbai, India
2 Department of Oral Medicine, Diagnosis and Radiology, Chhatrapati Shahu Maharaj Shikshan Sanstha Dental College and Hospital, Aurangabad, Maharashtra, India
3 Department of Conservative Dentistry and Endodontics, Vasantdada Patil Dental College and Hospital, Sangli, India

Correspondence Address:
Rahul Kumar
Shop no-2, Queensgate Co-operative Housing Society Ltd, Hiranandani Estate, Patlipada, Ghodbunder Road, Thane (West) - 400 607, Maharashtra
India

Aim: This in vitro investigation examined the effect of early coronal flaring (CF) and late CF on the working length (WL) in curved root canals. Background: The objective of this study was to determine if canal length is altered as a result of CF in curved canals of molar roots. Study Design: The conditions compared were combinations of (a) stainless steel hand files using Gates Glidden (G. G.) drills (SS) versus nickel-titanium rotary files (Ni-Ti); and (b) early CF (flaring completed before WL determination) versus late CF (flaring completed after WL determination). Selected were 90 canals of extracted maxillary or mandibular first molars (mesial root of mandibular molars and the mesiobuccal root of the maxillary molars) from three groups. CF was accomplished for the SS group using G. G. drills and for the Ni-Ti group using rotary ProTaper and Hero Shaper files. WL was determined by a digital vernier caliper before CF, immediately after CF, and again after canal preparation. Statistical Analysis: A repeated measures analysis of variance (ANOVA) test and a Tukey«SQ»s multiple prosthoc test were used for this study. Results: Results indicated that WL decreased for all canals as a result of canal preparation. The mean decrease in WL was significantly greater for the SS group (−0.77 ± 0.42 mm) than for the Ni-Ti groups (−0.33 mm ± 0.44). Less change in WL occurred in all groups when initial WL was determined after CF. Conclusion: WL in curved canals consistently decreases during the course of instrumentation. Clinician should keep this in mind for better treatment outcome.


How to cite this article:
Kumar R, Khambete N, Patil S, Hoshing U, Medha A, Shetty R. Working length changes in curved canals after coronal flaring by using rotary files and hand file: An in vitro study.J Conserv Dent 2013;16:399-403


How to cite this URL:
Kumar R, Khambete N, Patil S, Hoshing U, Medha A, Shetty R. Working length changes in curved canals after coronal flaring by using rotary files and hand file: An in vitro study. J Conserv Dent [serial online] 2013 [cited 2020 Aug 15 ];16:399-403
Available from: http://www.jcd.org.in/article.asp?issn=0972-0707;year=2013;volume=16;issue=5;spage=399;epage=403;aulast=Kumar;type=0