Analysis in vitro of shear bond strength of steel brackets bonded on bovine and human incisors.

Fábio Lourenço ROMANO, Stenyo Wanderley TAVARES, Edvaldo Luiz RAMALLI, Maria Beatriz Borges de Araújo MAGNANI, Darcy Flávio NOUER

The purpose of this study was to compare shear bond strength of steel brackets in bovine and human teeth and observe adhesive remnant index (ARI). The sample consisted of thirty teeth, divided into three groups: human permanent lower incisors, bovine permanent lower incisors and bovine deciduous lower incisors. Prophylaxis has been made with pumice and water, followed by enamel acid etching with phosphoric acid at 37% on the surface of the teeth. Steel brackets were bonded with Concise composite according to the manufacturer instructions, and they were submitted to a shear bond strength test for a 0,5 mm / minute speed. The medium values of bond strength in human permanent lower incisors was of x= 12,96 MPa, in bovine permanent lower incisors of x= 15,05 MPa, and bovine deciduous lower incisors of x= 17,03 MPa. There were not significant estatistic differences among the groups, not for strength shear values nor for the evaluation of the ARI.

Keywords: Bonding. Shear bond strength. Brackets. Bovine incisor.

Saturday, November 23, 2024 09:12