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Correlation of Pre-treatment Factors to Selected Treatment Modalities in Class III Deformity â??Orthodontic versus Combined Orthodontic and Orthognathic Surgeryâ?

Mehrangiz Ghassemi, Ralf Dieter Hilgers, Christoph Schindler, Michael Wolf and Alireza Ghassemi

Class III is a complex dentofacial deformity and requires an accurate treatment planning to achieve the best possible aesthetic and functional outcome by keeping the complications rate low. We looked for pre-treatment parameters correlated to the selected treatment modality. Material and methods: Lateral cephalometric radiographs of 74 adults with Class III deformity were analyzed. One group received orthodontic treatment and the other combined orthodontic and surgery. A logistic regression model analysis was performed to identify independent predictive skeletal, facial and aesthetic parameters that were significantly influenced by the chosen treatment modality. Results: Moderate statistical significance was observed in nose prominence (p=0.040), lower lip length (p=0.017), SNB (p=0.014), SNA (p=0.020) and ANB (p=0.026). The distance of the upper lip to the aesthetic line (p=0.003), the cervical length (p=0.009) and the ratio (p=0.007) were statistically significant to the performed treatment modality. Conclusion: We observed 7 cephalometric parameters with significant relationship to the selected treatment modality. However, we do not know if the orthodontist or the surgeon considered these factors for their planning. Further investigation is needed to illuminate this issue and the impact of each factor on outcomes.

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