Effects of Maxillary Protraction with Skeletal Anchorage and Petit-Type Facemask in High-Angle Class III Patients: A Retrospective Study

Introduction: Skeletal anchorage-supported applications are performed to increase the skeletal effect of maxillary protraction used in the treatment of Class III malocclusions related to maxillary retrognathia. Aim: To assess the craniofacial and soft tissue effects of the maxillary protraction with skeletal anchorage and Petit-type facemask in high-angle growth Class III young adolescent patients due to maxillary retrognathia. Materials and Methods: The archives for this retrospective study were scanned according to inclusion criteria as follows: skeletal Class III malocclusion due to maxillary retrognathia, high-angle growth pattern, treated using face mask with mini-plate anchorage. This study consisted of 15 patients (7 females and 8 males; mean age,11.96±1.03 years) treated using Petit-type face mask with mini-plate anchorage inserted in maxillae. Face-mask was used with an approximately 500 g force applied bilaterally from the hooks of the mini-plates. Patients used Petit-type face mask for a total of 6 months for the first three months throughout the day, the next 3 months for 12 hours a day. Cephalometric measurements were made to evaluate the effects of the maxillary protraction. The paired t-test was applied to evaluate differences between pre- and post-treatment variables. Results: In the present study, the skeletal Class III relationships were improved; maxillary measurements significantly increased (SNA° 3.48±0.42°; A–VRL 3.94±0.81 mm), SNB° decreased (-0.50±0.30°), ANB° increased (3.85±0.46°) (p0.05). The maxillary and mandibular incisors showed retroclination (-3.12±0.42° p