Evaluación de las variaciones dimensionales del Torque de Brackets nuevos

Abstract

The purpose of this study was to determine the dimensional variations of the torque of new stainless steel brackets, straight wire technique, with Roth prescription, of three different companies. A total of 360 brackets were chosen as the sample by a probability method; 120 of them from Ortho USA (Luminus), 120 from Ormco (Mini Twin) and 120 from Rocky Mountain Orthodontics, which were divided by dental group according to the dental arch (upper and lower) and differences in torque of the brackets from each commercial firms. The tolerance range was only established for the commercial firms Ortho USA, according to information provided by the manufacturer was ± 1°. The results show that for Ortho USA, torque values obtained in the dental groups of upper and lower canines, lower incisors and second premolars were close to the nominal values. For Ormco, torque values of dental groups lower canines and second premolars were the furthest from the nominal value, with a variation of 2 °. For Rocky Mountain Orthodontics the averages of all dental groups were very close to the nominal value. The brackets studied showed varying degrees of imprecision for excess or defect for the only company that declared its tolerance. The brackets of the commercial firms that didn’t report their tolerance appeared more accurately, but the lack of the requested information does not allow to extend the conclusions beyond the brackets measured.