Kamisetty Supradeep Kumar, Verma Jaya Krishanan, Sundari Shanta, Chandrasekhar Shyamala, Kumar Aravind
Reader, Department of Orthodontics & Dentofacial Orthopedics, St Joseph Dental College & Hospital , Duggirala, Eluru, W.G.Dist, Andhra Pradesh, India .
Consultant Orthodontist, Charles Pinto center, Jubilee Mission Hospital , Thrissur, Kerala, India .
J Clin Diagn Res. 2015 Sep;9(9):ZC04-8. doi: 10.7860/JCDR/2015/13865.6432. Epub 2015 Sep 1.
In today's world of economic crisis it is not feasible for an orthodontist to replace each and every debonded bracket with a new bracket- quest for an alternative thrives Orthodontist. The concept of recycling bracket for its reuse has evolved over a period of time. Orthodontist can send the brackets to various commercial recycling companies for recycling, but it's impractical as these are complex procedures and require time and usage of a new bracket would seem more feasible. Thereby, in-house methods have been developed. The aim of the study was to determine the SBS (Shear Bond Strength) and to compare, evaluate the efficiency of in house recycling methods with that of the SBS of new brackets.
Five in-house-recycling procedures-Adhesive Grinding Method, Sandblasting Method, Thermal Flaming Method, Buchman method and Acid Bath Method were used in the present study. Initial part of the study included the use of UV/Vis spectrophotometer where in the absorption level of base of new stainless steel bracket is compared with the base of a recycled bracket. The difference seen in the UV absorbance can be attributed to the presence of adhesive remnant. For each recycling procedure the difference in UV absorption is calculated. New stainless steel brackets and recycled brackets were tested for its shear bond strength with Instron testing machine. Comparisons were made between shear bond strength of new brackets with that of recycled brackets. The last part of the study involved correlating the findings of UV/Vis spectrophotometer with the shear bond strength for each recycling procedure.
Among the recycled brackets the Sandblasting technique showed the highest shear bond strength (19.789MPa) and the least was shown by the Adhesive Grinding method (13.809MPa).
The study concludes that sand blasting can be an effective choice among the 5 in house methods of recycling methods.
在当今经济危机的大环境下，正畸医生用新托槽替换每一个脱粘托槽是不可行的——因此对替代方法的探索盛行起来。托槽回收再利用的概念已经发展了一段时间。正畸医生可以将托槽送到各种商业回收公司进行回收，但这并不实际，因为这些都是复杂的程序，需要时间，而使用新托槽似乎更可行。因此，已经开发了内部回收方法。本研究的目的是确定剪切粘结强度（SBS），并比较、评估内部回收方法与新托槽SBS的效率。
本研究采用了五种内部回收程序——粘合剂研磨法、喷砂法、热火焰法、布赫曼法和酸浴法。研究的初始部分包括使用紫外/可见分光光度计，比较新不锈钢托槽底部与回收托槽底部的吸收水平。紫外吸光度的差异可归因于粘合剂残余物的存在。对于每个回收程序，计算紫外吸收的差异。使用英斯特朗试验机对新不锈钢托槽和回收托槽的剪切粘结强度进行测试。比较了新托槽与回收托槽的剪切粘结强度。研究的最后一部分涉及将紫外/可见分光光度计的结果与每个回收程序的剪切粘结强度进行关联。
在回收托槽中，喷砂技术显示出最高的剪切粘结强度（19.789MPa），而粘合剂研磨法显示的强度最低（13.809MPa）。
该研究得出结论，在五种内部回收方法中，喷砂法可能是一种有效的选择。
