Leão Filho Jorge César Borges, Braz Ana Karla Souza, de Araujo Renato Evangelista, Tanaka Orlando Motohiro, Pithon Matheus Melo
Dentistry Post-graduation Program in Orthodontics, School of Health and Biosciences, Pontifícia Universidade Católica do Paraná, Curitiba, PR, BR.
Biomedical Engineering Post-graduation Program, Universidade Federal de Pernambuco, Recife, PE, BR.
Braz Dent J. 2015 Jul-Aug;26(4):384-9. doi: 10.1590/0103-6440201300406.
The aims of this study were to evaluate quantitatively the enamel fractures, adhesive remnants and bracket fragments on enamel after debonding of metal and ceramic brackets, and to quantify the layer of adhesive remnants in depth after two different cleanup procedures. Metal and ceramic brackets were bonded on 120 human incisors and then debonded using two different techniques with Side Cutter (SC) and Anterior Bracket Removal plier (ABR). After this, a high-speed tungsten carbide finishing bur or a low-speed tungsten carbide finishing bur was used. The debonded samples were submitted to enamel assessment with optical coherence tomography (OCT). In sequence, two different methods of removing the remaining adhesive (tungsten carbide burs at high and low speed) were performed and at the end of these procedures, the remaining adhesive layer was measured with OCT. The results demonstrated that enamel fractures were observed only in the samples bonded with ceramic brackets, and the type of pliers did not influence the incidence and extent of enamel damage. Moreover, the type of debonding technique (with side-cutting pliers or anterior bracket removal pliers) and the type of bracket did not influence the amount of adhesive remaining after debonding. The burs at low speed removed the remaining adhesive more effectively during cleanup procedures.
本研究的目的是定量评估金属和陶瓷托槽脱粘后牙釉质骨折、粘结剂残余物和托槽碎片，并在两种不同的清洁程序后定量分析粘结剂残余物的深度层。将金属和陶瓷托槽粘结在120颗人切牙上，然后使用侧切钳（SC）和前托槽拆除钳（ABR）两种不同技术进行脱粘。在此之后，使用高速碳化钨精修钻或低速碳化钨精修钻。脱粘后的样本用光学相干断层扫描（OCT）进行牙釉质评估。接着，进行两种不同的去除残留粘结剂的方法（高速和低速碳化钨钻），在这些程序结束时，用OCT测量残留粘结剂层。结果表明，仅在粘结陶瓷托槽的样本中观察到牙釉质骨折，钳子类型不影响牙釉质损伤的发生率和程度。此外，脱粘技术类型（侧切钳或前托槽拆除钳）和托槽类型不影响脱粘后残留粘结剂的量。在清洁程序中，低速钻更有效地去除了残留粘结剂。
