Study Model-based Evaluation of Built-in Tip, Torque, and In–out Characteristics of a Third-generation Preadjusted Edgewise Appliance

Abstract

Aim:The aim of the study was to evaluate the clinical effectiveness of MBT™ preadjusted edgewise appliance (PEA) in terms of achieving the optimal expression of its built-in characteristics of tip, torque, and in-out. Materials and methods:Pretreatment and posttreatment study models of 20 subjects who received full fixed appliance treatment involving four first premolar extractions using the MBT™ appliance were measured for tip, torque, and in-out using the method described by Andrews. Treatment changes were analyzed statistically, and the posttreatment measurements were compared with the MBT™ specifications as well as Andrews' values for the above-mentioned parameters.Results: Except for the maxillary canines and second premolars, the built-in tip of MBT™ appliance was nearly fully expressed, though there was some lack of correlation with Andrews' values. Despite the fact that the full amount of torque built into the MBT™ appliance was not expressed, torque measurements for all teeth except the maxillary second premolars and the first molars showed either no statistically significant difference or were significantly higher than Andrews' values for these teeth. In-out readings were lower than both MBT™ and Andrews' values, but the relative order of crown prominences was similar. Conclusion and clinical significance:The MBT™ appliance is thus effective in ensuring a successful treatment result, though individual adjustments may be necessary for optimal tooth positioning at the end of the treatment, as with any preadjusted appliance.

Management of Dento-Maxillary Disharmony in Angle Class I Malocclusion with Anterior Crowding, Midline Shifting, and Deep Bite: A Case Report

“…2 Using 0.022" slots MBT bracket system which is a third-generation preadjusted edgewise appliance that introduces a range of improvements and specification changes to overcome the clinical shortcomings of earlier preadjusted edgewise bracket systems. 12 Present study showed that MBT appliance is effective in ensuring a successful treatment result, though individual adjustments may be necessary for optimal tooth positioning at the end of the treatment, as with any other preadjusted appliance. 12 Using 0.022" slots to perform more freedom of movement of initial aligning arch wires in the relatively larger slot is practiced; likewisenewer orthodontic alloys can be used in 0.022" slots with minimum patient discomfort and optimum clearance for sliding is obtained.…”

“…12 Present study showed that MBT appliance is effective in ensuring a successful treatment result, though individual adjustments may be necessary for optimal tooth positioning at the end of the treatment, as with any other preadjusted appliance. 12 Using 0.022" slots to perform more freedom of movement of initial aligning arch wires in the relatively larger slot is practiced; likewisenewer orthodontic alloys can be used in 0.022" slots with minimum patient discomfort and optimum clearance for sliding is obtained. 13,14 Leveling and aligning begins with NiTi round archwire; NiTi was used at the beginning because the wire bypasses 13 and 23.…”