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The objective of the study was to investigate the morphological changes of skeletal class III malocclusion in mixed dentition with light force protraction combined activities. Randomly selected 30 cases of orthodontics in Shanxi Medical Univer sity orthodontics patients (ages: 6-10 years) of the lateral cephalograms. Using the oral maxillary casting type of pre-traction device, accordin g to the co dition of maxillary dentition to select the corresponding activities of the movable expansion appliance, each side of the force of abo ut 150-200 g, requiring patients to wear 10-12 hours a day, the appliance should be removed after reaching normal occlusion. The correlation cepha ometric profile of the cranial lateral radiographs before and after orthodontic treatment was measured. All patients with skeletal clas s III malocclusion were improved, concave type became direct type, measurements SNA, ANB, A-Ptm, MP-SN, ANS-Me/N-Me increased, maxillary advanceme nt and reconstruction are more obvious; mandible rotates clockwise; the increase of lip inclination of anterior teeth compensatory changes, lower anterior tooth inclination changes smaller; upper lip forward, nasolabial angle decreased, improved appearance significan tly. Light force protraction combined activities can make the mixed dentition of skeletal class III malocclusion in patients with signific ant improvement in profile appearance.

Morphological Changes of Skeletal Class III Malocclusion in Mixed Dentition with Protraction Combined Activities