Evaluation of Shear Bond Strength Orthodontic Bracket and Adhesive Remaining Materials on the Enamel Surface Using ARI (Adhesive Remnant Index)

Abstract

The bracket attachment on the teeth uses a variety of adhesive materials, one of those materials is a resin composite. Composite resin polymerization can be done chemically and by irradiation or light cured. Along with the advancement of technology has been widely used light cured with a high intensity to shorten the operator work time. During orthodontic treatment, the shear strength is the force that mostly works on the bracket. After orthodontic treatment will remain adhesive on the enamel surface, the primary concern is to restore the enamel surface like its original condition. Objective: To determine differences in shear strength of the orthodontic bracket towards differences in the residual of adhesive material on the enamel surface. Materials and Methods: 5 premolars teeth of mandible were applied etchant materials, bonded and resin composite material was applied on the bracket base. Furthermore, the irradiation was done by using the LED with intensity of 2700 mW/cm2 and the exposure time was 10 seconds. Then it was immersed in artificial saliva on the incubator with temperature 370 C for 24 hours. The shear strength test was done by using the universal testing machine to determine the strength of bracket attachment from tooth surface. Furthermore, the residual of adhesive material on the tooth surfaces were observed by using stereo microscope and determined ARI scores (Adhesive Remnant Index).