Ultrasonic monitoring of the effect of sodium hypochlorite on the elasticity of dentine. (9th November 2012)

• Record Type: Journal Article
• Authors: John, C.; Löst, C.; ElAyouti, A.
• Is Part Of: International endontic journal. Volume 46:Number 5(2013:May)
• Page Start: 477
• Page End: 482
• Publication Date: 2012-11-09
• Subjects: Endodontics -- Periodicals; 617.6342
• DOI: 10.1111/iej.12015
• Languages: English
• ISSNs: 0143-2885

Abstract

<abstract abstract-type="main" id="iej12015-abs-0001"> <title>Abstract</title> <sec id="iej12015-sec-0001" sec-type="section"> <title>Aim</title> <p>To determine the change in ultrasonic velocity of dentine after the application of 5% NaOCl.</p> </sec> <sec id="iej12015-sec-0002" sec-type="section"> <title>Methodology</title> <p>Twenty standardized plano‐parallel dentine bars were divided into two groups. Dentine bars were wetted on only one surface. The test group (<italic>n </italic>= 10) was irrigated with 5% NaOCl, and the control group, (<italic>n</italic> = 10) with saline. Ultrasonic velocities before and after irrigation were compared to determine the change in the modulus of elasticity. Finally, dentine bars were loaded until failure in a 3‐point bending test. Paired <italic>t</italic>‐test and the mean of differences were used to assess the statistical significance between the groups.</p> </sec> <sec id="iej12015-sec-0003" sec-type="section"> <title>Results</title> <p>The mean ultrasonic velocity decreased by 1.4% after the application of NaOCl; no change was observed for saline. The mean velocity reduction of 49 m s<sup>−1</sup> was found to be highly significant (<italic>P </italic>= 0.004). The ultrasonically derived modulus of elasticity decreased by 2.6% compared to the initial value of 17.8 GPa. However, the observed reduction in elasticity derived from the 3‐point bending test was not significant (<italic>P </italic>= 0.238).</p> </sec> <sec id="iej12015-sec-0004" sec-type="section"> <title>Conclusions</title> <p>NaOCl reduced the ultrasonic velocity of dentine and the ultrasonically derived modulus of elasticity.</p> </sec> </abstract>