The Comparison of the Tensile, Shear-Peel, and Torque Orthodontic Bond Strength Test Methods Performed on a Resin and Two Glass Ionomer Cements

Abstract

The purpose of this study was to compare the tensile, shear-peel, and torque bond strength testing methods using a commercially available resin (R), light-cured (LC), and chemically cured (CC) glass ionomer. Sixty-three bovine incisors were randomly divided into three groups. Stainless steel incisor brackets were bonded to the prepared facial surfaces, and the specimens were stored in deionized water at 37° C for 38 hours. The specimens were then tested to failure using three loading modes. The bracket and enamel surfaces of each specimen were visually examined to determine the site of bond failure. R had the highest mean tensile, shear-peel, and torque bond strength. LC had a higher mean shear-peel and torque bond strength than CC. Tension testing left more adhesive than shear-peel and torque for CC, and more than shear-peel for R. The amount of LC left on enamel is positively correlated with bond strength for tension, shear-peel and torque. R remaining on enamel was positively correlated with bond strength only in tension. This study illustrates that loading mode does not appear to affect the relative bond strengths.