Comparison of the effects of rapid maxillary expansion versus Twin Block appliance on mandibular growth in skeletal Clas
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RESEARCH ARTICLE
Open Access
Comparison of the effects of rapid maxillary expansion versus Twin Block appliance on mandibular growth in skeletal Class II patients Jia‑Nan Zhang1, Si Chen2*, Cheng‑Yi Huang1, Chong Zhong3, Jing Jin3, Feng‑Yang Yu3, Zan‑Zan Zhang4 and Hai‑Ping Lu4*
Abstract Background: This is a retrospective study that compares mandibular growth changes in skeletal Class II patients treated by rapid maxillary expansion (RME) and following fixed appliance with those patients treated by Twin-Block (TB) and following fixed appliance. Methods: Fourteen patients treated by RME and following fixed appliance were included into the RME group. Fifteen patients treated by Twin-Block and following fixed appliance were included into the TB group. Lateral cephalometric radiographs taken before treatment and immediately after fixed appliance treatment were used to evaluate mandibu‑ lar growth effects. Results: The starting forms of the patients in the two groups were examined to be of good comparability. The mandibular length increased significantly in both groups as measured by Co-Gn, Go-Gn and Ar-Gn, but the TB group didn’t show more mandibular growth than the RME group (P > 0.05). Skeletal changes of the mandible in vertical dimension were different in the two groups. The change in FMA was 0.35° in the RME group, while the change was 2.65° in the TB group (P
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