부산대학교 도서관

OBJECTIVES: To test the hypothesis that there is no significant difference in clinical bracket failure between the 3M APC Mini Twin™ bracket system and the Transbond XT™ adhesive during orthodontic treatment. DESIGN: A randomized, split mouth, prospective clinical trial. SETTING AND SAMPLE POPULATION: The Department of Orthodontics and Dentofacial Orthopedics at University of Missouri, Kansas City. Twenty-nine subjects who were treatment planned to receive comprehensive orthodontics using 0.018 slot appliances. EXPERIMENTAL VARIABLE: The adhesive pre-coated brackets (APC) system was randomly assigned to one side of the mouth and the Transbond XT was assigned to the opposite side. OUTCOME MEASURE: The absence of any of the brackets at the time of a regular or emergency orthodontic appointment. RESULTS: There was no significant difference (P > 0.05) in bracket failure between the 3M APC Mini Twin bracket system and the Transbond XT adhesive at any time period (90, 180, or 365 days). The failure rate of brackets on premolars was higher than on incisors or canines. CONCLUSION: APC Mini Twin bracket system and Transbond XT adhesive are equally effective in maintaining brackets clinically. Inexperienced operators had an overall 7.5% bond failure 12 months following bracket placement.