Journal of Operative Dentistry & Endodontics

Register      Login

VOLUME 1 , ISSUE 2 ( July-December, 2016 ) > List of Articles

RESEARCH ARTICLE

Effect of 5% Calcium Hypochlorite on Mechanical Properties of Root Dentin: An in vitro Study

Natanasabapathy Velmurugan, Poornima Reddy, Suma Balla, Sandhya S Raghu, Garlapati T Gupta, Hrudi S Sahoo

Citation Information : Velmurugan N, Reddy P, Balla S, Raghu SS, Gupta GT, Sahoo HS. Effect of 5% Calcium Hypochlorite on Mechanical Properties of Root Dentin: An in vitro Study. J Oper Dent Endod 2016; 1 (2):56-59.

DOI: 10.5005/jp-journals-10047-0012

Published Online: 00-12-2016

Copyright Statement:  Copyright © 2016; Jaypee Brothers Medical Publishers (P) Ltd.


Abstract

Introduction

The aim of this study was to compare in vitro the effect of 5% calcium hypochlorite [Ca(OCl)2] and 5% sodium hypochlorite (NaOCl) on flexural strength and modulus of elasticity of root dentin.

Materials and methods

The available chlorine concentration of each solution was determined using iodometric titration. Standardized planoparallel dentin bars (n= 20) were divided into two test groups and one control group. The control, group 1, consisted of dentin bars stored in normal saline. The dentin bars in the two test groups were treated by exposure to following solutions: Group 2 to 5% Ca(OCl)2; and group 3 to 5% NaOCl. All the three test solutions were changed once in 15 minutes for 30 minutes. The dentin bars were then loaded to failure using three-point bend test.

Results

Available chlorine concentration was 64% in both the test solutions. There was a significant reduction in the flexural strength of 5% NaOCl group compared to 5% Ca(OCl)2-treated ones. A significant difference in modulus of elasticity was observed between the test groups and the control groups and also between the 5% Ca(OCl)2 and 5% NaOCl groups.

Conclusion

Within the limitations of this study, 5% NaOCl reduced the flexural strength and modulus of elasticity of root dentin bars more when compared to 5% Ca(OCl)2.

How to cite this article

Reddy P, Balla S, Raghu SS, Velmurugan N, Gupta GT, Sahoo HS. Effect of 5% Calcium Hypochlorite on Mechanical Properties of Root Dentin: An in vitro Study. J Oper Dent Endod 2016;1(2):56-59.


PDF Share
  1. Changes in root canal geometry after preparation assessed by high-resolution computed tomography. J Endod 2001 Jan;27(1):1-6.
  2. Root canal irrigants. J Endod 2006 May;32(5):389-398.
  3. Mechanism of action of sodium hypochlorite. Braz Dent J 2002;13(2):113-117.
  4. Complications following an accidental sodium hypochlorite extrusion: a report of two cases. J Clin Exp Dent 2012 Jul 1;4(3):e194-e198.
  5. The effect of sodium hypochlorite irrigant concentration on tooth surface strain. J Endod 2002 Aug;28(8):575-579.
  6. Effect of sodium hypochlorite and EDTA irrigation, individually and in alternation, on dentin microhardness at the furcation area of mandibular molars. Braz Dent J 2012;23(6):654-658.
  7. Effect of sodium hypochlorite on dentin microhardness. J Endod 2004 Dec;30(12):880-882.
  8. Effect of exposing dentin to sodium hypochlorite and calcium hydroxide on its flexural strength and elastic modulus. Int Endod J 2001 Mar;34(2):113-119.
  9. Sodium hypochlorite alterations of dentin and dentin collagen. Surf Sci 2001 Oct;491(3):444-455.
  10. Influence of endodontic irrigants on bond strength of a self-etching adhesive. Aust Endod J 2011 Apr;37(1):26-30.
  11. The sterilization of milk bottles with calcium hypochlorite. Am J Public Health (NY) 1912 Apr;2(4):282-287.
  12. Comparative evaluation of calcium hypochlorite and sodium hypochlorite on soft-tissue dissolution. J Endod 2012 Oct;38(10):1395-1398.
  13. Comparative evaluation of calcium hypochlorite and sodium hypochlorite associated with passive ultrasonic irrigation on antimicrobial activity of a root canal system infected with Enterococcus faecalis: an in vitro study. J Endod 2014 Dec;40(12):1953-1957.
  14. Standard test methods for flexural properties of un-reinforced and reinforced plastics and electrical insulating materials. In: Annual book of ASTM standards. Vol. 08.01. Philadelphia (PA): American Society for Testing and Materials; 1989. p. 290-298.
  15. Pulp. In: Bhaskar SN, editor. Orban's oral histology and embrology. 11th ed. Chicago (IL): Mosby; 1990. p. 110.
  16. The mechanical properties of human dentin: a critical review and re-evaluation of the dental literature. Crit Rev Oral Biol Med 2003;14(1):13-29.
  17. Collagen orientation and crystallite size in human dentin: a small angle X-ray scattering study. Calcif Tissue Int 2001 Jul;69(1):31-37.
  18. Role of molecular level interfacial forces in hard biomaterial mechanics: a review. Ann Biomed Eng 2010 Jun;38(6):2040-2055.
  19. Effect of MTAD on flexural strength and modulus of elasticity of dentin. J Endod 2003 Nov;29(11):747-750.
  20. Impact of irrigant sequence on mechanical properties of human root dentin. J Endod 2007 Nov;33(11):1325-1328.
  21. Effects of different exposure times and concentrations of sodium hypochlorite/ethylenedi-aminetetraacetic acid on the structural integrity of mineralized dentin. J Endod 2010 Jan;36(1):105-109.
  22. Effect of sodium hypochlorite on human root dentin-mechanical, chemical and structural evaluation. Int Endod J 2007 Oct;40(10):786-793.
  23. Effect of sodium hypochlorite on mechanical properties of dentin and tooth surface strain. Int Endod J 2001 Mar;34(2):120-132.
  24. Diffusion of hydrogen ion and hydroxyl ion from various sources through dentin. Int Endod J 1988 Jan;21(1):17-26.
PDF Share

© Jaypee Brothers Medical Publishers (P) LTD.