The Journal of Contemporary Dental Practice

Register      Login

SEARCH WITHIN CONTENT

FIND ARTICLE

Volume / Issue

Online First

Archive
Related articles

VOLUME 14 , ISSUE 2 ( March-April, 2013 ) > List of Articles

RESEARCH ARTICLE

An in vivo Study to determine the Effects of Early Preflaring on the Working Length in Curved Mesial Canals of Mandibular Molars

Mahmoud K AL-Omiri, Azhar Iqbal, Iftikhar Akbar

Citation Information : AL-Omiri MK, Iqbal A, Akbar I. An in vivo Study to determine the Effects of Early Preflaring on the Working Length in Curved Mesial Canals of Mandibular Molars. J Contemp Dent Pract 2013; 14 (2):163-167.

DOI: 10.5005/jp-journals-10024-1293

Published Online: 01-04-2013

Copyright Statement:  Copyright © 2013; Jaypee Brothers Medical Publishers (P) Ltd.


Abstract

Aim

To evaluate the effects of a preflaring method on the determination of working length in the curved mesial canals of mandibular molars.

Materials and methods

Ninety mandibular molars with apical curvature of 30 to 40° were selected and randomly divided into two groups; each containing 45 teeth. In the first group, the initial instrumentation was performed with preflaring on the mesiobuccal canal (preflared group), and in the second group; the instrumentation was performed without preflaring on the mesiobuccal canal (nonpreflared group). A size 15 K-file was inserted in the mesiobuccal canals until the apical constriction could be felt by tactile sensation and a radiograph was taken to identify the distance between the file tip and radiographic apex. The location of the tip was classified as (a) within 1 mm of the radiographic apex, (b) more than 1 mm of the radiographic apex, or (c) overextended beyond the radiographic apex. The collected data was statistically analyzed and probability value was set to be ≤ 0.05.

Results

The file tip was significantly closer to the true working length in the canals with early preflaring compared to the canals without early preflaring (p < 0.005). In the preflared group; 75.5% of the cases had the file tip in location ‘a’, 13.3% in location ‘b’, and 11.1% in location ‘c’. In the nonpreflared group; 33.3% of the cases had the file tip in location ‘a’, 53.3% in location ‘b’ and 13.3% in location ‘c’.

Conclusion

Preflaring the coronal portion of curved canals greatly improved the access to the apical constriction, and thus enhanced correct working length determination. If the coronal portion of the curved canals is not preflared, the clinician cannot discern the accuracy of what they feel apically. Thus, preflaring is a highly recommended procedure especially in curved canals for better determination of correct working length.

How to cite this article

Iqbal A, Akbar I, AL-Omiri MK. An in vivo Study to determine the Effects of Early Preflaring on the Working Length in Curved Mesial Canals of Mandibular Molars. J Contemp Dent Pract 2013;14(2):163-167.


PDF Share
  1. Endodontic cavity preparation. In: Endodontics (4th ed). Philadelphia: Lea & Febiger 1994:191-208.
  2. Cleaning and shaping the root canal system. In: Pathways of the pulp (5th ed). St Louis: CV Mosby 1991:174-88.
  3. An in vitro study of change in working length following instrumentation of first molar teeth. J Coll Physicians Surg Pak 2002;2(2):71-73.
  4. A simple and accurate way of measuring root canal length. J Endod 1985;11:42.
  5. Determination of working length in endodontics. Radiographic method. ZWR 1991;100(1):30-35.
  6. Biologic aspects of endodontics. Periapical tissue reactions to root canal fillings short of and beyond the apex. Oral Surg Oral Med Oral Pathol 1973;36:725-26.
  7. Predominant microflora associated with human dental periapical abscesses. J Clin Microbiol 1982;15:964.
  8. Development of predictable periapical lesion monitored by subtraction radiography. Endod Dent Traumatol 1987;3:192-208.
  9. Microscopic investigation of root apexes. J Am Dent Assoc 1995;50:544-52.
  10. Prevalence of teaching apical patency and various instrumentation and obturation techniques in United States dental school. J Endod 1997;23:394-96.
  11. A stereomicroscopic study of the root apices of 400 maxillary and mandibular teeth. Oral Surg 1986;9:249.
  12. Cleaning and shaping the root canal. Dent Clin North Am 1974;18:269.
  13. A method of canal preparation to control apical extrusion of low temperature thermoplasticized gutta percha. J Endod 1987;13(1):18-23.
  14. Coronal root canal preparation. Dent Study J 1983;61:46-48.
  15. Position of the apical foramen in relation to endodontic therapy. J Can Dent Assoc 1971;8:305-08.
  16. The position of the apical foramen of the permanent incisors. Aust Dent J 1988;33:51-55.
  17. Evaluation of the accuracy of the Neosono-D electronic apex locator. J Endod 1984;10:164-67.
  18. Effect of preflaring on tactile detection of apical constriction. J Endod 1995;21:92-94.
  19. Effect of preflaring on Root Zx Apex locators. J Endod 1999;25(9):625-26.
  20. In vitro evaluation of the reliability of the Endex electronic apex locator. J Endod 1998;24:120-21.
  21. The effect of instrumentation on root canal length as measured with an electronic device. J Endod 1983;9:114-15.
  22. Change in working length following instrumentation of molar canals. Oral Surg 1986;11:114.
  23. Detecting the apical constriction in curved mandibular roots. J Ayub Med Coll 2003;15:47-49.
  24. An in vitro study of the shaping ability of two rotary endodontic instruments in curved root canals. Asian J Oral Health Allied Sci 2011;1(1):1-92.
  25. Tactile assist to working length determination. Practical Endod 1995;1:28-30.
  26. An evaluation of the crown down pressureless technique. J Endod 1984;10(10):491-93.
  27. St Louis: CV Mosby 2004;30:3427.
  28. Effect of early coronal preflaring on working length change in curved canals using rotary nickel titanium versus stainless steel instruments. J Endod 2002;28(6):438-41.
  29. Evaluation of the preparation of the coronal part of the mesial canals of lower molars. Odontostomatol Trop 2011;34(133):13-21.
  30. Evaluation of preparation of curved root canals using hand used ProTaper. Zhonghua Kou Qiang Yi Xue Za Zhi 2009;44(5):262-65.
  31. Comparison of the canal preparation in straight and curved root canal. Oral Surg 1971;32:271-75.
  32. Principles of endodontics (3rd ed). Philadelphia: WB Saunders 2002:200-02.
PDF Share
PDF Share

© Jaypee Brothers Medical Publishers (P) LTD.