Abstract: An adjustable orthodontic bracket is described which includes a body member having an orthodontic archwire fixing member and a first faying surface; a bonding base member having a second faying surface and a tooth bonding surface; and a connecting member that includes a layer of a thermoplastic polymer, and which connects the first faying surface of the body member to the second faying surface of the bonding base member. Methods of repositioning and manufacturing the adjustable orthodontic brackets are also described. A method is also provided for reducing a bond strength of an orthodontic appliance adhered to a tooth structure with a cured adhesive composition, which includes treating the orthodontic bracket with ultrasonic energy thereby reducing the bond strength more than about 20%. The cured adhesive composition includes an ultrasonic energy responsive filler, and under the ultrasonic energy stimulation, the cured adhesive composition softens thereby reducing the overall bonding strength.