Treatment of Class II using extra-alveolar miniscrews in the IZC, associated with self-ligating appliances: case report

Henrique Mascarenhas Villela

Introduction: : Angle Class II malocclusions of moderate dentoalveolar or skeletal nature may be treated by means of extractions in the maxillary arch, distalization of the maxillary arch, and/or mesialization of the mandibular arch. With the purpose of achieving the desired final dental relationship, in addition to extractions, intermaxillary devices or various types of conventional anchorage resources may be used; however, all of these promote some types of side effect, which could be undesirable and difficult to control. The introduction of extra-alveolar miniscrews in the infrazygomatic crest increased the efficiency of maxillary arch distalization, by simplifying the orthodontic mechanics and annulling the undesirable side effects, by means of a minimally invasive procedure. The major advantage of this devices is to position the body of miniscrews away from the roots of the teeth to be moved. This allows larger sagittal movements without the need for repositioning these devices or the use of cursors. Furthermore, another advantage is the simplicity of their installation, with good acceptance by patients. Objective: To report a clinical case in which extra-alveolar miniscrews were used on the infrazygomatic crest as resource for anchorage, to allow distalization of the maxillary arch, associated with self-ligating appliances of MBT prescription, for correction of Class II of mild skeletal nature. Conclusion: The association of extra-alveolar miniscrews with the system of self-ligating appliances has shown to be efficient in the correction of Class II malocclusion, simplifying the orthodontic mechanics, inhibiting the undesirable side effects, obtaining excellent torque control, and diminishing the dependence on patient compliance.

Keywords: Orthodontic miniscrew. Mini-implant. Class II malocclusion. Self-ligating appliances. Infrazygomatic crest. IZC.

How to cite: Villela HM. Treatment of Class II using extra-alveolar miniscrews in the IZC, associated with self-ligating appliances: case report Clin Orthod. 2021 Oct-Nov;20(5):52-76.

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