Abstract
Three methods of bonding orthodontic brackets to acrylic teeth were investigated for use with a typodont. One-hundred-and-twenty Dentaurum® 0·018 × 0·025 inch standard Edgewise brackets were bonded to Crylopax® cross-linked acrylic teeth using three cements: Concise® composite, Concise® with acrylic primer, and GAC® acrylic cement on a previously roughened tooth surface. Half the specimens in each group was immersed in a thermostatically controlled water bath for 15 min on 20 occasions over a 5-day period, to simulate the conditions of a typodont, prior to measuring tensile bond strength on an Instron™ machine. Under dry conditions Concise® composite was significantly stronger than either Concise® with acrylic primer or GAC® cold cure acrylic resin. Under wet conditions, however, the mean bond strengh of the acrylic resin increased significantly compared to the other cements. The bond strength of both Concise® and Concise® composite with primer deteriorated following water immersion. It is suggested that when setting up typodont teeth with brackets bonded with GAC® acrylic resin, immersion of the bonded teeth in hot water prior to positioning of the teeth in the typodont may greatly reduce the risk of subsequent bracket loss.
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