Group III: This group comprised of 10 brackets manufactured by Ormco and recycled flaming the base, cleaning the base with ultrasonic cleaner then dipping the bracket into the electropolisher and using Fostamatinib R788 silane coupling agent in place of primer. Group IV: This group comprised of 10 brackets manufactured by Ormco and recycled by flaming and removing the remaining composite by ultrasonic cleaning. Ice cube plastic trays were poured by sandstone and teeth were embedded in them. After surface preparation, the enamel surface was
treated with an acid etchant to improve wettability and surface area. A 37% phosphoric acid gel (3M etchant) was applied to the buccal surface of each tooth for 15 s. The teeth then rinsed with a continuous water spray for 30 s and dried with an air-spray until the buccal surface of the etched teeth appeared to be chalky white in colour.4 After etching the primer (Transbond XT Primer, 3M Unitek) was applied on the
enamel photo-polymerized for 10 s. A small layer of adhesive (Transbond XT, 3M Unitek) was applied to the bracket base and positioned on the pretreated crowns. After some time, brackets were debonded using the bracket debonding plier. Curing of light cure resin material was done with light emitting diode (Dentaurum Australia Private Limited, 18 Bertram St., Mortlake, Australia) having intensity of 440-480 nw/cm2. Sand blasting was done with portable sandblasting unit manufactured by Samit Dental Equipment’s, Delhi using 50 micron aluminum oxide abrasive powder. Flaming was done with non-luminous zone of the flame of the gas torch manufactured by Libral Traders, Delhi. The shear bond strength was measured using a Universal Testing Machine manufactured by Banbros Machines, Delhi. The test for shear bond strength was conducted at ITS Engineering College, Greater Noida. All photographs were taken using Nikon L 310, 13.5 megapixels camera. Results The present study was undertaken in the Department of Orthodontics and Dentofacial Orthopedics of Teerthanker Mahaveer Dental College and Research
Centre with the objective of determining the shear bond strength of metal brackets debonded and recycled with various recycling methods available in the department. Shear bond strength (± standard deviation [SD]) in Megapascals (Mpa) for brackets recycled by four methods of recycling and represented individually Anacetrapib were determined. They were found to be as follows: Shear bond strength of the control group was higher than that of the four test groups (Table 1). The mean shear bond strength of the control group was found to be 9.24 Mpa with SD 1.24 Mpa (Graphs (Graphs11 and and22). Table 1 Shear bond strength of the control group and experimental group comprise of four groups of 10 brackets in each group with surface area of 6 mm2 in Megapascals (Surface area -6 mm2). Graph 1 Shear bond strength of 10 samples of the control group.