Efectos del envejecimiento de la resistencia adhesiva microtensil de tres sistemas adhesivos

Abstract

Adhesive systems are the retention mechanism of composite resins and their performance over time will depend on the success of the restoration. A study was conducted to determine the microtensile adhesive strength of three total etch adhesives: AdperTM Single Bond 2, One Coat Bond SL and Prime-Dent Bonding Resin. Thirty-six molars were selected and randomly divided into 3 groups according to the adhesive system, each of these groups was further divided into 2 subgroups after aging in two humidity conditions: 100% humidity (H) and submerged in water (S). The occlusal enamel was removed to apply the adhesives under study on dentin, and a resin block was built on that surface, then the restored molars were sectioned to obtain 1mm2 sticks and subjected to aging for 98 days. Then a microtensile force was applied to each bar until the moment of adhesive failure was reached. A statistical analysis was performed by univariate ANOVA, and Tukey’s DSH (p <0.05), obtaining an average total adhesive strength of 14.5628 MPa for the 100% humidity groups, higher than for those submerged in water with 12.7267 MPa, being the AdperTM Single Bond 2 adhesive (H=19.2440±11.67 MPa / S=16, 6120±16.21 MPa) obtained the highest microtensile adhesive strength, followed by One Coat Bond SL (H=15.0925±7.17 MPa / S=12.6980±10.35 MPa) and finally Prime-Dent Bonding Resin (H=9.3520±6.64 MPa / S=8.8700±7.62 MPa). It is concluded that hydrolytic degradation due to aging influenced the adhesives studied by decreasing their adhesive strength.