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The International Journal of Adult Orthodontics & Orthogathic Surgery
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International Journal of Adult Orthodontics and Orthognathic Surgery

Year 1990
Volume 5 , Issue 1

Pages: 59 - 65

Soft tissue profile changes following orthodontic treatment of Chinese adults with Class III malocclusions


years) exhibiting true Class III dental and skeletal malocclusions were treated orthodontically with the edgewise appliance and extractions of mandibular first premolars together with simultaneous anterior expansion of the maxillary arch. A retrospective cephalometric study was undertaken to determine the soft tissue profile changes at least 6 months postretention. Significant cephalometric changes included decrease in the mandibular incisor protrusiveness by 6.4 mm (P < .001) and accompanying lower lip protrusiveness by 4.4 mm (P < .01), together with a slight forward movement of the maxillary incisors by 1.7 mm (P < .05) and, consequently, a slight increase in upper lip protrusiveness by 1.2 mm (P < .05) and decrease in nasolabial angle (P < .05). The overall improvement in lip profile provided by this mandibular arch contraction/maxillary arch expansion orthodontic appraoch appears to be a viable alternative in mild-to-moderate Class III patients who decline orthognathic surgery.


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