Deformasi Slot Beberapa Produk Braket Stainless Steel Akibat Gaya Torque Pada Kawat Stainless Steel

Bracket slot deformation can reduce the amount of torque that will be transmitted to teeth and supporting tissues. The quality of some stainless steel brackets in the market is still questionable for orthodontic treatments. This research aims to compare the amount of torque expression due to torsion angle of 30° and 45° at the stainless steel wire and bracket slot permanent deformation caused by the torque in each examined bracket brands (3M, Biom, Versadent, Ormco and Shinye). Fifty Stainless Steel Edgewise brackets from five different brands (n = 10) were attached onto an acrylic. Each bracket slot width was measured with a stereoscopic microscope and then mounted onto a torque apparatus that had been prepared for this study. Once the torque test was done, the width of bracket slot was re-measured to determine if there was a difference from initial bracket slot width at 45°. The results of ANOVA showed significant differences in the amount of torque at torsion angle of 30°and 45° between Biom and Shinye with Omrco. The 3M transmitted the highest load (30°= 442,12 gmcm and 45°= 567,99 gmcm), while the lowest was of Biom (300 = 285,50 gmcm and 450 = 361,38 gmcm). Differences in slot bracket deformation were found virtually in all groups of bracket brands. Deformation of bracket slots occurs only in Biom (2.82 µm) and Shinye (2.52 µm). From the observation, it is concluded that one of the major factors that affect torque and deformation of bracket slot is composition and manufacturing process of the stainless steel brackets. Manufacturing process that does not meet the standard can lead to a poor quality bracket. Permanent slot deformation in this study occurrs with Biom and Shinye bracket brands.