Ahrari Farzaneh, Basafa Mohammad, Fekrazad Reza, Mokarram Mohammad, Akbari Majid
Dental Materials Research Center, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.
Photomed Laser Surg. 2012 Jan;30(1):41-6. doi: 10.1089/pho.2011.3088. Epub 2011 Dec 1.
This study aimed to evaluate the efficiency of erbium, chromium: yttrium-scandium-gallium-garnet (Er,Cr:YSGG) laser in removing adhesive from bracket bases, and its influence on shear bond strength (SBS) of orthodontic brackets, compared to several other recycling methods.
Reconditioning the dislodged attachments is frequently required in orthodontic practice to reduce treatment costs.
Seventy-five premolar teeth were selected and divided into five groups. In groups 1 to 4, brackets recycled with different methods were bonded on the tooth surface, whereas in group 5, new brackets were used. The recycling methods were: silicon carbide stone grinding (group 1), aluminum oxide sandblasting (group 2), and Er,Cr:YSGG laser operated at 3.5 W (group 3) and at 4 W (group 4). The quantitative amount of remaining adhesive on the bracket base was determined after recycling using stereomicroscopic images, and the SBS values were measured.
The percentage of adhesive remnants was significantly lower in brackets cleaned with aluminum oxide sandblasting, and significantly higher in those grinded by silicon carbide stone (p<0.05). Brackets cleaned with silicon carbide stone produced the lowest, and those prepared by aluminum oxide blasting or Er,Cr:YSGG laser produced the highest SBS among the groups (p<0.05). There was a significant correlation between changes in percentage of remaining adhesive on the base after recycling with changes in SBS (Pearson r=-0.41, p<0.0001).
Under the study conditions, both aluminum oxide blasting and Er,Cr:YSGG laser were efficient in removing adhesive from bracket bases, and resulted in significantly higher bond strength than for new brackets.
本研究旨在评估铒铬钇钪镓石榴石（Er,Cr:YSGG）激光去除托槽基底上的黏合剂的效率，以及与其他几种再利用方法相比，其对正畸托槽剪切粘结强度（SBS）的影响。
正畸治疗中经常需要对脱落的附件进行修复以降低治疗成本。
选取75颗前磨牙并分为五组。第1至4组中，用不同方法再利用后的托槽粘结在牙面上，而第5组使用新托槽。再利用方法包括：碳化硅磨石打磨（第1组）、氧化铝喷砂（第2组）、3.5W功率的Er,Cr:YSGG激光处理（第3组）和4W功率的Er,Cr:YSGG激光处理（第4组）。再利用后，通过体视显微镜图像确定托槽基底上残留黏合剂的定量，测量SBS值。
氧化铝喷砂清洁后的托槽上黏合剂残留百分比显著更低，碳化硅磨石打磨的托槽上黏合剂残留百分比显著更高（p<0.05）。各组中，碳化硅磨石打磨的托槽产生的SBS最低，氧化铝喷砂或Er,Cr:YSGG激光处理的托槽产生的SBS最高（p<0.05）。再利用后基底上残留黏合剂百分比的变化与SBS的变化之间存在显著相关性（Pearson r=-0.41，p<0.0001）。
在本研究条件下，氧化铝喷砂和Er,Cr:YSGG激光在去除托槽基底上的黏合剂方面均有效，且产生的粘结强度显著高于新托槽。
