Early treatment effect of orofacial myofunctional therapy on Class II1 malocclusion

Abstract

Objective To clarify the effect of orofacial myofunctional therapy on early treatment of class Ⅱ1 malocclusion. Methods 14 patients were selected, aged from 7+ 3 to 12+ 1, with 3 boys and 10 girls. 11 of them were mixed dentition and 3 were permanent dentition. The patients showed crowding, and the overjet ranged from 5.0 mm to 11.0 mm. 3 of them presented with 100% overbite. All patients underwent orofacial myofunctional therapy with myofunctional appliances I2N (Myofunctional Research Co. Queensland, Australia)after myofunctional evaluation. Statistic analysis was done with SPSS19.0 software and paired t-test was used. Results After 6-10 months, myofunction were improved, teeth were aligned, deep overjet and deep overbite corrected, and facial profile improved. The overjet [(4.82±1.92) mm], overbite [(2.25±0.64) mm] and proclination of the upper incisor [(2.75±2.36) mm, 6.96°±6.14°] decreased after treatment and showed statistical significance (P<0.001). The inclination of lower incisor (-2.10°±2.90°), SNB (-2.04°±2.29°) and FMA (-1.46°±1.75°) increased and showed statistical significance (P<0.05). Conclusions Orofacial myofunctional therapy was a noninvasive and easy way to treat class Ⅱ1 malocclusion early. Myofunctional evaluation and exercises are the key points. It is important to have patients' good compliance. Key words: Orofacial myofunctional therapy; Class Ⅱ1 malocclusion; Early treatment