[Effect of the Carriere Motion appliance combined with palatal canine bite turbos on Class II subdivision malocclusion in adults: A retrospective study].

Introduction: Class II subdivision malocclusions are common and challenging to treat due to their asymmetry. The range of orthodontic correction devices is expanding toward systems that may offer more comfort for patients but often lack scientific evidence supporting their efficacy. The objective of this study was to evaluate, for the first time, the effect of a Class II correction device, the Carriere Motion (CM) combined with palatal canine bite turbos, in adult patients with Class II subdivision malocclusion.

Material And Methods: This retrospective study included all adult patients with Class II subdivision malocclusion who underwent orthodontic treatment with the CM appliance combined with palatal canine bite turbos and had a complete orthodontic record. Measurements were taken from dental casts before (T0) and after (T1) CM use, as well as cephalometric analyses were performed before (T0) and after (T2) completing orthodontic treatment. Statistical analyses were conducted to assess both dentoalveolar and skeletal effects of treatment with CM.

Results: Fourteen patients (26 ± 2.83 years; 72% women) were eligible for inclusion. Between T0 and T1, a significant correction of Class II molar and canine relationships (p < 0.01), a significant reduction in overjet (T0: 4.19 mm vs. T1: 2.94 mm, p < 0.01), and a significant alignment of midlines were observed. Moreover, significant distal rotations of the CM-supported canines and molars were noted at T1. Additionally, CM-supporting canines showed significant extrusion (p < 0.01) compared to non-supporting canines, though this was clinically negligible (additional extrusion of 1 mm on average). SNA, SNB, and ANB angle values showed no significant changes between T0 and T2.

Conclusion: Within the conditions and limitations of this study, the effect of the CM - combined with the addition of retro-palatal canine bite - on the correction of Class II subdivision malocclusions appears to be dentoalveolar. The canine supporting the CM exhibited minimal extrusion.