PDF https://www.odontologiavirtual.com/2013/07/roth-versus-mbt-does-bracket.html The aim of this study was to investigate the bracket manufacturers claims that when a patient is treated to a reasonable occlusal outcome, then small changes in bracket prescription can lead to visually detectable differences in tooth positions. The null hypotheses were that there are no differences in the subjective aesthetic judg e ments of orthodontists as to the appearance of torque of the maxillary and mandibular incisors and the tip of the maxillary canines between cases treated using a pre-adjusted edgewise appliance with a Roth or MBT prescription.