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Original Article

Versatility features of the MBT™ system: Use of lower canine brackets in borderline class III cases

2015, Volumen 45, Número 2
Hugo Trevisi, Renata Trevisi, Ricardo Moresca, Lars Christensen
Ortodoncista. Centro de Estudos Ortodônticos. Brasil

Versatility in orthodontic technique can be described as the feature that allows changes in the position of a tooth or set of teeth (tip, rotation and torque) without the need to use additional brackets during treatment. The creators of the MBT™ orthodontic technique (McLaughlin, Bennett and Trevisi)incorporated versatility features into the MBT™ technique with the purpose of using one single prescription of orthodontic brackets in various types of malocclusion, while still enabling individual overcorrections. When versatility is applied to a given orthodontic technique it enables individualized tooth positioning aimed at overcorrecting a dental malocclusion by placing a single bracket differently on the same tooth, or using brackets and buccal tubes of a given tooth on a different tooth. Versatility is a technical feature that enables individualized orthodontic treatment, minimizing the need to place first, second, and third order bends in orthodontic wires in the four phases of treatment. Horizontal positioning (in-out), rotation, angulation (tip), and inclination (torque), represented by first, second, and third order bends placed in orthodontic wires, are pre-built into pre-adjusted brackets. It is only in unusual cases that these bends are further incorporated into the wires, such as for example in cases where changes in the form and size of the clinical crown occur. Thus, the key objective of pre-adjusted appliances is to minimize the need to place bends in orthodontic wires. Nevertheless, it should be noted that, even using a technique that has incorporated versatility features, in certain cases professionals should individualize treatment by placing third order bends in rectangular wires (torque), depending on the severity of the malocclusion and/or the biomechanics employed. The SmartClip™ Self-Ligating Appliance, for example, provides the same prescription features present in an MBT™ appliance. It is therefore possible to use the same versatility features of the MBT™ appliance with a SmartClip™ Self-Ligating Appliance. It should also be emphasized that an orthodontic technique is considered versatile when it does not exhibit rotational control (rotational overcorrection) in its bracket prescription. The MBT™ appliance provides the following versatility features: – 180° rotation of maxillary lateral incisors in anterior crossbite cases, providing –10° torque; – Three torque options for upper canines (–7°, 0°, +7°), and three torque options for lower canines (–6°, 0°, +6°); – Use of lower second and first molar tubes on upper first and second molars on the opposite side for cases finished in a Class II molar relationship; – 180° rotation of maxillary canines in cases of agenesis of maxillary lateral incisors when treatment planning requires space closure; – Flipping/swapping of lower canine brackets in borderline Class III cases, providing –3º angulation (Fig. 8); – Interchangeable brackets for upper premolars – same angulation and torque; – Interchangeable brackets for lower incisors – same angulation and torque.  (Rev Esp Ortod. 2015;45(2):065-074)

Key words:
Versatility. MBT™. Class III.
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