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Ultrasonic monitoring of the effect of sodium hypochlorite on the elasticity of dentine
Author(s) -
John C.,
Löst C.,
ElAyouti A.
Publication year - 2013
Publication title -
international endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.988
H-Index - 119
eISSN - 1365-2591
pISSN - 0143-2885
DOI - 10.1111/iej.12015
Subject(s) - sodium hypochlorite , elasticity (physics) , materials science , ultrasonic sensor , elastic modulus , composite material , young's modulus , dentistry , chemistry , medicine , organic chemistry , radiology
Aim To determine the change in ultrasonic velocity of dentine after the application of 5% NaOCl. Methodology Twenty standardized plano‐parallel dentine bars were divided into two groups. Dentine bars were wetted on only one surface. The test group ( n = 10) was irrigated with 5% NaOCl, and the control group, ( n = 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 t ‐test and the mean of differences were used to assess the statistical significance between the groups. Results 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 −1 was found to be highly significant ( P = 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 ( P = 0.238). Conclusions NaOCl reduced the ultrasonic velocity of dentine and the ultrasonically derived modulus of elasticity.