Hard and Soft Tissue Changes in Thai Patients Treated by Mandibular Setback
The purposes of the present study were to evaluate the soft tissue and dentoskeletal profiles changes in Thai adults prognathic patients who underwent mandibular setback and and to describe the interaction between the movement of the soft and hard tissue. Pre- and post-surgical lateral cephalograms of 10 patients at the mean age 21.3 years (18 to 24 years) were used. A computerized cephalometric assessment, Smart’n Ceph v 8.0 (Researcher) digitizer software (Y&B Products, Chiangmai, Thailand), was used to evaluate the distances of the hard and soft tissue landmarks in the sagittal and vertical planes. The results revealed that considerable facial changes and improvement took place after the surgical procedure. The mean mandibular set back postsurgically was 6.5±2.1 mm. Posterior movements at points B and Pogonion was accompanied by reductions ranging from 107% to 100% of the corresponding soft tissue. The soft tissue changes demonstrated a significant correlation not only with the corresponding hard tissue landmarks, but also with non corresponding anatomical points. Assessment of ratios of soft to hard tissue changes after mandibular setback permitted the dentist to predict patient’s profile prior to the surgery.
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