Krell K V, Courey J M, Bishara S E
College of Dentistry, University of Iowa, Iowa City.
Am J Orthod Dentofacial Orthop. 1993 Mar;103(3):258-66. doi: 10.1016/0889-5406(93)70007-B.
The purpose of this study was to examine the effects of ultrasonic orthodontic bracket removal and cleanup and compare them with conventional debonding and cleaning of the enamel surfaces with burs and polishing disks. The amount of enamel loss and time for bracket removal and clean-up were also addressed. Thirty extracted human premolars were collected. The teeth were randomly placed in one of the three debonding groups: debonding with orthodontic pliers and enamel clean-up with finishing burs and polishing disks (group 1), debonding with orthodontic pliers and ultrasonic clean-up of the enamel surface (group 2), and ultrasonic debonding enamel clean-up (group 3). The teeth were stored for 48 hours in 100% humidity before bracket removal. All brackets were then removed. Polyvinyl siloxane impressions were made before and after bracket removal. Direct measurements of the teeth in micrometers were made at all steps. An additional 30 teeth were similarly prepared, and the brackets were debonded and cleaned-up as in the three groups previously described. The total time for bracket removal and enamel clean-up for each group was recorded in seconds.(ABSTRACT TRUNCATED AT 250 WORDS)
本研究的目的是检验超声去除正畸托槽及清理的效果，并将其与使用车针和抛光盘对牙釉质表面进行传统去粘结及清洁的效果进行比较。同时还探讨了牙釉质损失量以及去除和清理托槽所需的时间。收集了30颗拔除的人类前磨牙。这些牙齿被随机分为三个去粘结组之一：用正畸钳去粘结并用精修车针和抛光盘清理牙釉质（第1组），用正畸钳去粘结并对牙釉质表面进行超声清理（第2组），以及超声去粘结并清理牙釉质（第3组）。在去除托槽前，将牙齿在100%湿度下保存48小时。然后去除所有托槽。在去除托槽前后制作聚醚橡胶印模。在所有步骤中对牙齿进行直接微米测量。另外30颗牙齿也进行了类似处理，并按照上述三组的方法去除托槽并进行清理。记录每组去除托槽和清理牙釉质的总时间（以秒为单位）。（摘要截选至250字）
