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Abstract

Objective: Improving facial profile by orthognathic surgery is requested more often by female patients. The aim of this study is to investigate the responses of major labeled landmarks and constructed intermediate points on facial profiles of Class III female patients treated by bimaxillary surgery. Material and methods: 16 skeletal Class III female patients requiring Le Fort I osteotomy and bilateral sagittal split osteotomy were selected in this study. Cephalometric tracing was carried out, and selected landmarks were digitized. The surgical outcome and the correlation of soft to hard tissue changes were assessed. Results: The surgical result revealed normalized skeletal relationship and acceptable facial profile for all subjects. In horizontal and vertical direction, mandibular movement ratio of soft to hard tissue showed approaching 1:1 and 0.9:1 with strong correlation. The maxillary components presented moderate correlation except i-LS to U1E with movement ratio around 0.8:1 horizontally and 0.6:1 vertically. The paired groups in the nasal region presented weak correlation. Conclusion: The maxillary and mandibular movement ratios showed acceptable reliability in facial profile change. Furthermore, the constructed intermediate points also possessed the ratios of movement and the correlation coefficients similar to the adjacent landmarks. These results can provide clinicians with further more reliable landmarks to configure the planning profile.

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