Hs. Baik, CLINICAL-RESULTS OF THE MAXILLARY PROTRACTION IN KOREAN CHILDREN, American journal of orthodontics and dentofacial orthopedics, 108(6), 1995, pp. 583-592
Sixty subjects with ages ranging from 8 to 13 years were divided into
two groups according to the intraoral appliances used. Group I consist
ed of 47 subjects with rapid palatal expansion (RPE) appliances End gr
oup II consisted of 13 subjects with labiolingual appliances (La/Li).
Group I was subdivided into three subgroups by age and two subgroups b
y the timing of the protraction. The cephalometric radiographs of all
subjects were analyzed before and after correction of anterior crossbi
te. The following results were obtained: (1) After maxillary protracti
on, the maxilla and maxillary dentitions moved forward and downward, a
nd the mandible and mandibular dentitions moved backward and downward.
(2) The maxilla moved more forward in the RPE group, compared with La
/Li group. (3) The palatal plane angle decreased more in the protracti
on-during-palatal expansion group than protraction-after-palatal-expan
sion group. (4) Age did not show any statistically significant differe
nce.