Abstract
The combination of ethylenediaminetetraacetic acid (EDTA) and sodium hypochlorite (NaOCl) has been advocated as an effective irrigation methodology to remove organic and inorganic matter in root canal therapy. Yet, it was suggested that both solutions might lead to structural changes of the dentinal wall surface, depending on the order of application which might affect sealer mechanical retention. This study aims to evaluate the effect of different irrigating protocols on dentin surface roughness using quantitative 3D surface texture analysis. Data stems from 150 human root dentin sections, divided into five groups, each prepared according to one of the following protocols: Negative control; 17% EDTA; 17% EDTA followed by 5.25% NaOCl; 5.25% NaOCl; and 5.25% NaOCl followed by 17% EDTA. Each dentin sample was examined for its three-dimensional surface texture using a high-resolution confocal disc-scanning measuring system. EDTA 17% and the combined EDTA 17% with NaOCl 5.25% showed considerably higher roughness properties compared to the control and to NaOCl 5.25% alone. However, the irrigation sequence did not affect the dentin roughness properties. Therefore, mechanical retention is probably not dependent upon the selection of irrigation protocol sequence.
Highlights
Adequate sealing ability and sufficient adhesive strength are required properties for sealer efficacy[1,3]
The protocols of ethylenediaminetetraacetic acid (EDTA) 17% and EDTA 17% combined with NaOCl 5.25% (E, EN, NE) showed significantly higher roughness properties compared to NaOCl 5.25% alone (N) in 10 out of 30 parameters (Sv, Sal, Sda, Sdr, Spd, Spc, S10z, S5v, Sda and Sha) (p < 0.001, Table 1, Figs. 2, 3)
We introduced a new methodology to analyze 3D surface area roughness of dentin after applying different irrigation solutions
Summary
Adequate sealing ability and sufficient adhesive strength are required properties for sealer efficacy[1,3]. Micromechanical bonding requires the presence of surface irregularities into which the adhesive can penetrate[1,3] These irregularities can be quantified by measuring surface roughness, which is a component of surface texture that is evaluated by the deviation of an ideal surface from the real surface. May act as a physical barrier and affect the sealing efficiency of the root canal filling To avoid these consequences, irrigation is used to remove the smear layer[10,12], requiring the use of a chelating agent and a soft-tissue solvent[13]. It was reported that applying EDTA and NaOCl solutions to the root canal resulted in an eroded appearance of the dentin and enlarged tubular orifice diameters[20,21] This could be of clinical significance as in the case of the alteration micromechanical bonding of the adhesive materials. The aim of the current study was to evaluate the effect of irrigation protocols on dentine surface roughness
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