Comparative study of the treatment effects with FR III and Sander III appliances in children with Class III malocclusion

• 1、School/Hospital of Stomotology Lanzhou University,Lanzhou,730000

Abstract：Purpose: To evaluate and compare the skeletal and facial changes of children with mild skeletal Class III malocclusion following the treatment of the Function Regulator III appliance and the Sander III appliance. Materials and methods: The study sample consisted of 40 children presenting skeletal Class III malocclusion. The group of patients treated with the Function Regulator III appliances (FR-III) consisted of 20 subjects with a mean age of 7.615±0.9996 years. The group of patients treated with the Sander III appliances (SD-III) consisted of 20 subjects with a mean age of 7.68±1.0665 years. Lateral cephalograms were obtained immediately before initiation and after completion of the treatment. Twenty-one variables were used for the analysis of skeletal and lateral profile changes. The non-parametric test was utilized to evaluate the presence of significant changes (P < 0.05). Results: Cephalometric analysis showed that the ANB angle increased by 4.05o in the SD-III group, compared with 1.46o in the FR-III group (p < 0.0001). There was 1.93o and 5.75o increase in GoGn-SN and FMA respectively in SD-III group, and the trends in FR-III group were similar, but there was no statistical difference between the two groups(p＞0.05). Conclusion: SD-III is suitable for the maxillary deficiency of skeletal Class III malocclusion with low or average mandibular plane angle, rather than the high angle patients with apparent mandibular overgrowth. FR-III is suitable for the functional crossbite with low or average angle and the patients of mild skeletal Class III malocclusion with normal upper and lower jaws.

keywords： skeletal Class III malocclusion treatment anterior crossbite FR-III appliance Sander III appliance Early treatment

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