The deviation and misalignments of teeth and jaw can lead to Angle class III malocclusion which causes cross-bite in front incisor and molar teeth with relatively high prevalence. The prevalence of patients with Angle class III malocclusion due to alveolar bone or the combination of maxillary laterally deficiency and mandibular prognathism can vary in ethnicities and residential habitats. In clinical practice, the authors have conducted the treatments for 38 cases of Angle class III malocclusion aiming for the following objectives: Evaluate dentofacial phenotypes, X-ray images of Angle class III malocclusion patients. Analyze the results of treatments using MBT tipedge straight wire technique in patients with Angle class III malocclusion. The treatment results have shown that: In 38 Angle class III malocclusion cases, the prevalence of the malocclusion was 31.75 percent due to abnormality in alveolar bones, 21.05 percent due to underdeveloped of maxillary bones, due to prognathism of mandibular jaw accounting for 5.26 percent and due to the combination of maxillary deficiency and mandibular prognathism accounting for the greatest percentage of 42.10 percent. The average PAR indices were 27.2626 +/- 3.15 before treatment and 3.86 +/- 1.21 after treatment. Based on the relationship, between PAR indices and needed space for Angle III treatment, the number of patients who require tooth extractions was accounted for 68.42 percent. The collected data on Cephalometric films pre and post treatments of Angle class III malocclusion showed improvements in prognosis, especially with a good correspondence in sagittal plane (anterior to posterior relationship). The percent of good results was 84.21 percent and that of mediocre result was 15.78 percent. The average duration of the treatments was 28 +/- 3,286 months.
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