The effect of maxillary protraction on front occlusion and facial morphology.
The intention of this work was to study the dentoalveolar and basal jaw changes in a group of children (aged 5-10 years) with nonforced anterior crossbite treated with maxillary protraction from a face mask and to compare the changes with those found in a control group with normal dentoalveolar and basal maxillomandibular relationship. The data were obtained from lateral cephalograms of 22 children taken before treatment, after a treatment period of 3-12 months, and after an observation period of 6-48 months. A group of children (n = 40) with normal maxillomandibular relationship served as controls. During treatment the mandibular prognathism was reduced, and a positive overjet was established in 18 children. The changes during the observation period were generally comparable to those found in the control group, and thus indicated a very small relapse tendency. The posttreatment comparison of the groups showed fewer significant differences than before treatment, indicating that the treatment had a normalizing effect not only on the negative overjet but also on the general face morphology.
Wisth
P J
PJ
Tritrapunt
A
A
Rygh
P
P
Bøe
O E
OE
Norderval
K
K
D000202:Activator Appliances; D002508:Cephalometry; D002648:Child; D002675:Child, Preschool; D005115:Extraoral Traction Appliances; D005147:Facial Bones / Q000033:anatomy & histology*; D005260:Female; D006801:Humans; D008297:Male; D008310:Malocclusion / Q000628:therapy*; D008313:Malocclusion, Angle Class III / Q000628:therapy*; D009968:Orthodontic Appliances, Removable; D010155:Palatal Expansion Technique; D012886:Skull / Q000033:anatomy & histology