Efeito da ativação ultrassónica de medicações a Base de hidróxido de cálcio na variação do PH Radicular em reabsorções externas simuladas

Abstract

The aim of this study was to verify the influence of the ultrasonic activation of calcium hydroxide intracanal medications on pH changes in simulated external root resorption. Eighteen unirradicular teeth were selected. Only teeth with a single root canal were included in this sutdy. The crowns were sectioned, the root length was standardized and the chemical-mechanical preparation was performed. The resorptions were simulated at 7.5 mm from the apex and were 3 mm in diameter. The dentinal tickness between the root canal and the simulated external resorption was standardized at 1.2mm (+/- 0.2). For that, the specimens were scanned by a Microcomputed Tomography. The teeth were divided into 3 experimental groups: control group - without intracanal medication; group I - Ultracal XS without ultrasonic activation; group II – Ultracal XS with ultrasonic activation. pH measurements were performed using a microelectrode after 3, 12, 24 hours, 3, 5, 7, 14, 21 and 28 days. The analysis of variance (ANOVA) and Tukey's test were used for statistical analysis. The results showed that there were statistically significant differences (p <0.05) in 24 hours, 5 and 7 days when compared to the control group with group I; 3, 12, 24, 72 hours, 5 and 28 days when compared the control group with group II; and hours, 3, 5, 7, 21 and 28 days when comparing group II to group I. It was concluded that the ultrasonic activation did not significantly influence the elevation of the pH in the root surface in simulated external resorption.