Deformasi Slot Beberapa Produk Braket Stainless Steel Akibat Gaya Torque Kawat Beta Titanium

Slot Deformation in Various Stainless Steel Bracket Products due to The Torqueing Force of Beta Titanium Wire. Stainless Steel bracket slot deformation affects force applied to teeth. The research aims to determine slot deformation of five different bracket brands namely, 3M, Biom, Versadent, Ormco and Shinye due to torque of Beta Titanium wire 0.021 x 0.025 inch with torsional angle of 45° and the amount of torque with torsional angle of 30° and 45°. The research also attempts to compare the deformation and amount of torque among all five bracket brands. Fifity Stainless Steel Edgewise brackets from five bracket group brands (n=10) were attached on acrylic. Bracket slot measurement was carried out in two stages: firstly, deformation measurement by calculating average bracket slot height with stereoscopy microscope before and after application of torque; and secondly, measurement of torque with a torque measurement apparatus. Statistical analysis showed that there are slot deformations on the five bracket brands with clinical permanent deformation on Biom (2,79 µm) and Shinye (2,29 µm). The amount of torque on the five bracket brands from the highest is 3M, Ormco, Versadent, Shinye and Biom. From correlation assessment between bracket slot deformation and amount of torque in the five brands, a difference is found in the deformation in five brands except 3M, Ormco, Biom and Shinye. There is a difference in the amount of torque between the five brands with torsional angle of 30° (except 3M and Ormco) and 45°. It is concluded that metal compositions and manufacturing process are the factors that influence the occurrence of deformation bracket slot and the amount of torque. Manufacturing process using MIM and metal compositions of AISI 303 and 17-4 PH reduce the risk of deformation.