A new study, making a three-dimensional comparison of the torque achieved with a readjusted edgewise appliance using a Roth or a MBT bracket prescription, has found that there is no statistical difference clinically in the final inclination of teeth between the two bracket prescriptions.
The study, published online ahead of the print publication of The Angle Orthodontist, looked for any significant differences in the final inclination of the upper and lower anterior teeth of patients treated with either of a Roth or an MBT bracket prescription. The researchers looked at 40 sets of post treatment study models from patients treated using a readjusted edgewise appliances—20 Roth and 20 MBT. The patients were selected using predetermined inclusion and exclusion criteria.
The researchers masked and laser-scanned the models and used the digital images to assess the final crown inclinations of UL1, UR3, and LR1. They conducted a two-way analysis of variance, where final crown inclination was the dependent variable and bracket prescription (Roth or MBT) and tooth type were the independent variables.
The findings show no statistically significant differences in terms of the final inclination of the anterior teeth between the two bracket prescriptions (P = .132). Still, the researchers report statistically significant differences between the final inclinations of different tooth types investigated (P < .001).