Comparative study in vitro on the different times of conventional acid etching system before bonding with an universal adhesive on bovine dentina

Abstract

Universal adhesives and their versatility with adhesive techniques generate a controversy between the use and non-use of etching acid before the application of the universal adhesive. Objective: To find the optimal acid etching time prior to the application of Clearfil Universal Bond on bovine tooth dentin, by analyzing the values of resistance to microtraction. Material and methods: Experimental, prospective and comparative study. 6 bovine upper central incisors were used, from which 80 specimens were obtained and divided into 4 groups of 20 specimens each. After complying with the parameters of each group, the specimens were subjected to the microtraction test. Results: The group of acid etching for 10 seconds showed a higher resistance to microtraction with a minimum resistance of 10.43 MPa and a maximum resistance of 31.45 MPa, showing an average resistance of microtraction of 20.78±6.36 MPa. Conclusion: The adhesive resistance to microtraction in bovine dentin under the etching and rinsing mode for 10 seconds prior to the Clearfil Universal Bond universal adhesive system was higher compared to the group treated only with the universal adhesive system, in addition to proving that a reduced exposure time of phosphoric acid in dentin is ideal to avoid deterioration of the dentin surface, considering its morphology.