ObjectiveTo explore the correlation between craniomaxillofacial changes and soft tissue profile improvement after orthodontic treatment in patients with class Ⅱ high-angle malocclusion. MethodsThe X-ray lateral cephalometric films of 22 adult patients with classⅡ high-angle malocclusion were selected before and after treatment, cephalometric roentgenogram was performed to compare the changes in skeletal tissue, dental tissue and soft tissue before and after treatment, and the correlation between soft and hard tissue changes was analyzed. ResultsAfter orthodontic treatment, maxillary and mandibular incisors exhibited 7.55 mm and 3.05 mm retraction, respectively; the prominence of upper and lower lips relative to Ricketts esthetic plane decreased by 3.02 mm and 2.74 mm, respectively;G-Sn-Pos, Z angle and Cm-Sn-UL increased by 2.39°, 3.72°and 8.11°, respectively, and all these changes showed statistically significant differences(P＜0.05). △G-Sn-Pos positively correlated with △Pos-Y(r=0.411, P＜0.05), and negatively correlated with △FMIA(r=-0.402, P＜0.05); Z angle variance negatively correlated with △U1-SN (r=-0.414), △UL-Y (r=-0.421) and △LL-Y (r=-0.435) (P＜0.05); △Cm-Sn-UL negatively correlated with △UI-Y (r=-0.542),△UL-Y (r=-0.388),△U1-SN (r=-0.516) and △FMIA(r=-0.400) (P＜0.05). ConclusionAfter orthodontic treatment, adult patients with class Ⅱ high-angle malocclusion have dramatically retracted incisors, exhibiting a harmonious relationship among nose, lip and chin. Profile improvement moderately correlates with changes in the retraction of upper and lower incisors and changes in the prominence of upper and lower lips.

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