Distal molar movement with Kloehn headgear: is it stable?
The aim of this study was to evaluate intramaxillary molar movement after 8 months of cervical traction and posttreatment displacement 7 years later. The total molar displacements in relation to stable intraosseous reference points were compared with those observed in an untreated control group that also had intraosseous reference indicators inserted. During the headgear period, the type of molar displacement could be predicted by the direction of the force system acting on the teeth. It was noted, however, that the variation in the vertical development was related more to each patient's growth pattern than to the force system applied. After cessation of the headgear, intramaxillary displacement of the molars was noted, and the total displacement of the molars did not differ from that of the untreated group. The indication for intramaxillary displacement of the molars by means of extraoral traction is therefore questioned.
Melsen
Birte
B
Department of Orthodontics, Royal Dental College, University of Aarhus, Denmark. orthodpt@odont.au.dk
Dalstra
Michel
M
D002508:Cephalometry; D002648:Child; D003818:Dentition, Mixed; D005115:Extraoral Traction Appliances / Q000145:classification*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008437:Maxilla / Q000254:growth & development; D008963:Molar / Q000473:pathology*; D016382:Orthodontic Appliance Design; D013223:Statistics as Topic; D013314:Stress, Mechanical; D014078:Tooth Eruption; D014087:Tooth Movement Techniques / Q000295:instrumentation*; D014716:Vertical Dimension