Effect of dentin surface pretreatment with four conditioning agents on micro-shear bond strength of a self-adhesive cement
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Wilson Choque-Apaza [2] ; Marco Sánchez-Tito [1]
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[1] Universidad Privada de Tacna
Universidad Privada de Tacna
Tacna, Perú
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[2] Private practice, Tacna, Peru
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- Localización: Journal of Clinical and Experimental Dentistry, ISSN-e 1989-5488, Vol. 14, Nº. 5 (May), 2022, págs. 390-395
- Idioma: inglés
- Enlaces
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Resumen
To evaluate the effect of dentin surface pretreatment with four conditioning agents on the micro-shear strength of a self-adhesive cement.
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.
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.
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.
