ABSTRACT
Background: To evaluate the effect of dentin surface pretreatment with four conditioning agents on the micro-shear strength of a self-adhesive cement. Material and Methods: 32 specimens of 6 mm high x 4 mm wide with dentin exposure were obtained and divided into four groups of NaOCI, CHX, EDTA and AgNPs (n = 8). 2 mL of each treatment agent was applied to the dentin for 60 seconds. Composite resin cylinders measuring 3 mm x 2 mm were cemented with RelyX U200 self-adhesive cement. Micro-shear testing was performed after 24 hours and one week (n = 4) with a 1 mm/min; failure values were recorded in MPa. The failure pattern was evaluated with a stereomicroscope at 20x. The Kruskal-Wallis test was used to evaluate differences between groups. The Mann-Whitney U test was used to evaluate between evaluation times. The significance level used was p<0.05. Results: At 24 hours after cementation, the highest value of micro-shear bond strength was observed for chlorhexidine (15.951 MPa), this value were similar for NaOCl 4% and EDTA, however significant differences were observed when compared with AgNPs (p<0.05). When compared the values at 24 hours and after one week, no differences were observed (p>0.05). The most frequent failure pattern was mixed, followed by adhesive failure. Conclusions: Pretreatment of dentin with sodium hypochlorite, CHX and EDTA positively affected the 24-hour bonding capacity of RelyX U200 self-adhesive resin cement, although it decreased after one week. Key words:Dental cements, disinfectants, calcium chelators, nanoparticles.
ABSTRACT
RESUMEN El tratamiento de la dentina como paso previo al procedimiento de adhesión tiene como propósito mejorar las condiciones del sustrato mejorando la fuerza de unión entre la superficie dentaria y el material de restauración, promoviendo mayor longevidad y estabilidad de la restauración. El objetivo del estudio fue realizar una revisión de la literatura que describe las propiedades de diferentes agentes acondicionantes de la dentina. Se realizó una revisión de la literatura incluyendo trabajos publicados entre el 2014 a 2020, de bases de datos médicas como PubMeb, SciELO y ScienceDirect; en idioma inglés, español y portugués. Se seleccionaron un total de 20 artículos que cumplían los criterios de inclusión. Se ha identificado en la literatura el uso de diversos agentes pre tratamiento de la dentina, principalmente agentes químicos como el hipoclorito de sodio, clorhexidina, el ácido etilenodiaminatetraacético (EDTA), las nanopartículas metálicas y las técnicas mecánicas como la abrasión por aire con óxido de aluminio y bicarbonato de sodio.
ABSTRACT Dentin treatment as a prior step to the adhesion procedure is intended to improve the substrate condition by improving the bonding strength between the tooth surfaces and the restorative material, promoting greater longevity and stability of the restoration. The objective of the study was to carry out a review of the literature that describes the properties of different conditioning agents of dentin. A review of the literature was carried out, including works published between 2014 and 2020, from medical databases such as PubMeb, SciELO and ScienceDirect; in English, Spanish and Portuguese. A total of 20 articles that met the inclusion criteria were selected. The use of various dentin pre-treatment agents has been identified in the literature, mainly chemical agents such as sodium hypochlorite, chlorhexidine, ethylenediaminetetraacetic acid (EDTA), metallic nanoparticles and mechanical techniques such as air abrasion. with aluminum oxide and baking soda.