Étude rétrospective céphalométrique comparant les changements dento-alvéolaires à la suite d’un traitement avec Twin Block, Carrière® Motion 3D™ Appliance et Xbow
Introduction: The objective of this retrospective study is to compare the skeletal and dento-alveolar changes caused by three functional appliances, the Twin Block (TB), the Xbow (Xb), and the Carrière® Motion 3D™ Appliance (CMA), during the first phase of treatment for class II correction. Methods: The pre-treatment (T0) and post-functional treatment (T1) lateral cephalometric radiographs of 43 adolescent patients treated with a TB (15), an Xb (7) or a CMA (21) were recovered and traced, and 12 skeletal and 10 dental measurements were analyzed. The differences (T1-T0) between the appliances will be compared using the ANOVA analysis, independent samples t-tests, or Mann-Whitney U-tests. Results: On average, the treatments lasted 10.1 ± 3.2 months with the TB and 7.4 ± 2.7 months with the CMA. The TB group experienced greater mandibular length and sagittal position changes by increasing Cd-Pg (3.4 mm), Pg-Go (1.3 mm), N-B (//FH) (1.3 mm), and S-N-B (1.2°) more than the CMA. The TB improved the Wits appraisal 2.2 mm more than the CMA. The TB also had a superior retroclining effect on the maxillary incisor inclination and position by reducing U1–FH (4.2°) more than the CMA. The CMA restrained the antero-posterior movement of the maxillary first molar while the TB had no significant effect on this variable. The only clinically significant change that the CMA displayed was in relation to mandibular incisor proclination, L1–MP (4.1°). The results related to the Xb group were excluded due to its very small sample size. Conclusion: Class II correction is achieved by a combination of skeletal and dento-alveolar changes with the TB, but primarily through dento-alveolar effects with the CMA. A bigger sample size is required in order to properly compare the effects of the Xb.
Twin Block Carrière® Motion 3D™ Appliance Xbow Dento-alveolar effects