Bonded orthodontic brackets were subjected to cyclic loading in order to simulate the effect of occlusal forces. The subsequent effect on bond strength was determined. Stainless steel, mesh-based bracket were bonded to extracted teeth with either composite resin or glass ionomer cement. A jig was designed to subject each bracket to a preselected loading level and the 24-hour shear/peel bond strength of both stressed and unstressed brackets was subsequently measured. Cyclic loading brought about a comparative decrease in bond strength when using both types of material. The potential implications of selecting these different type of bonding material for clinical use are discussed.
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