Abstract
Introduction
The purpose of this study was to analyze the influence of ultrasonic activation of
calcium hydroxide (CH) pastes on pH and calcium release in simulated external root
resorptions.
Methods
Forty-six bovine incisors had their canals cleaned and instrumented, and defects were
created in the external middle third of the roots, which were then used for the study.
The teeth were externally made impermeable, except for the defected area, and divided
into the following 4 groups containing 10 samples each according to the CH paste and
the use or not of the ultrasonic activation: group 1: propylene glycol without ultrasonic
activation, group 2: distilled water without ultrasonic activation, group 3: propylene
glycol with ultrasonic activation, and group 4: distilled water with ultrasonic activation.
After filling the canals with the paste, the teeth were restored and individually
immersed into flasks with ultrapure water. The samples were placed into other flasks
after 7, 15, and 30 days so that the water pH level could be measured by means of
a pH meter. Calcium release was measured by means of an atomic absorption spectrophotometer.
Six teeth were used as controls. The results were statistically compared using the
Kruskal-Wallis and Mann-Whitney U tests (P < .05).
Results
For all periods analyzed, the pH level was found to be higher when the CH paste was
activated with ultrasound. Calcium release was significantly greater (P < .05) using ultrasonic activation after 7 and 30 days.
Conclusions
The ultrasonic activation of CH pastes favored a higher pH level and calcium release
in simulated external root resorptions.
Key Words
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Article info
Publication history
Published online: April 26, 2012
Footnotes
Supported by FAPESP (Proc. n. 2008/07202-0).
Identification
Copyright
© 2012 American Association of Endodontists. Published by Elsevier Inc. All rights reserved.
