Sj. Sung et Hs. Baik, ASSESSMENT OF SKELETAL AND DENTAL CHANGES BY MAXILLARY PROTRACTION, American journal of orthodontics and dentofacial orthopedics, 114(5), 1998, pp. 492-502
To further evaluate the effect of maxillary protraction on facial grow
th, cephalometric changes in 129 subjects with conditions diagnosed as
skeletal Class III malocclusion and who had been treated with maxilla
ry protraction were compared to 9 male and 12 female subjects with ann
ual cephalometric records from the Yonsei growth study sample. The; co
ntrol subjects had Angle Class I malocclusions with normal overjet and
overbite. More maxillary forward displacement and mandibular growth i
nhibition were observed in the protraction group during treatment, and
the difference from the untreated controls was statistically signific
ant. When changes due to treatment according to ages were compared, th
ere was no statistical difference. The direction of maxillary growth w
as similar in the untreated and protraction groups. Maxillary protract
ion had a growth-stimulating effect on the maxilla during the treatmen
t period.