Comparison between metallic and polymer ultrasonic tip in debris removal capacity in simulated side channels and organic matter dissolution.

• Grant number: 22/14091-7
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: December 01, 2022
• End date: November 30, 2023
• Field of knowledge: Health Sciences - Dentistry - Endodontics
• Principal Investigator: Marco Antonio Hungaro Duarte
• Grantee: Eduarda dos Santos Silva
• Host Institution: Faculdade de Odontologia de Bauru (FOB). Universidade de São Paulo (USP). Bauru , SP, Brazil

Abstract

Irrigation agitation methods have been increasingly recommended in Endodontics with the intention of potentiating the cleaning and antisepsis of the root canal system, since areas of complexity are not touched by the instruments and it becomes difficult to clean them by conventional irrigation. Thus, agitation protocols of the irrigation solution increases its contact with the canal walls and tends to provide the entrance of the irrigator to areas of complexity. Therefore, this research project aims to compare the properties of smear layer removal and solubility of simulated irrigator tissue, comparing metallic ultrasonic tip with polymeric. For this, curved prototyped lower molars with a window in the apical region for the insertion of bovine dentin chips with smear layer will be divided into 3 groups: group 1: conventional irrigation with 1% sodium hypochlorite without agitation and EDTA; - group 2: irrigation with 1% sodium hypochlorite and EDTA performing agitation with conventional ultrasonic tip (Irrisonic); e - group 3: irrigation with 1% sodium hypochlorite and EDTA performing and agitation with the ultrasonic tip of Pic polymerate. For the organic matter solubility test, capillaries with chrome catgut wire will fit in the windows of the apical third, in which they will be in contact with the channel and allow the analysis of the power of tissue dissolution. The capillary alone and with the wire inside will be weighed before and after each protocol described above. The initial weight will be subtracted from the final weight. The difference will be divided from the initial weight and then will have the percentage of solubilization. The data of the weights before and after, as well as the solubilization percentage will be submitted to normality tests by Shapiro-Wilkis. If normal distribution occurs, the intragroup data will be compared by the T-test, if normal distribution does not occur, the data will be compared by the Wilcoxon test. For comparison between groups, the Anova and Tukey test will be used if the distribution is normal and kruskal-wallis and dunn test, if the data do not present normal distribution. A significance level of 5% will be employed.