Dental and skeletal contributions to occlusal correction in patients treated with the high-pull headgear-activator combination.
The purpose of this study was to examine dental and skeletal changes in patients treated with the high-pull headgear-activator combination. A group of 40 consecutively treated subjects with a Class II molar relationship and a minimum of 5 mm overjet was used for this study. The results showed that Class II correction often was achieved by distal repositioning of the maxillary teeth (mean, 0.07 mm) and mesial repositioning of the mandibular teeth (mean, 3.3 mm) with a wide range of variation. Correlation of maxillary molar repositioning with total interarch occlusal change showed a positive relationship; however, a weak correlation suggested that other variables were contributing factors, in addition to distal upper molar positioning. The change in mandibular molar position compared with the movement of pogonion strongly suggests that forward growth of the mandible is important to the correction of the Class II malocclusion. When total molar repositioning in the upper jaw was correlated with total molar repositioning in the lower jaw, a strong inverse correlation was found, indicating that upper molar movement parallels lower molar movement.
Lagerström
L O
LO
Department of Orthodontics, Halmstad, Sweden.
Nielsen
I L
IL
Lee
R
R
Isaacson
R J
RJ
D000202:Activator Appliances; D000293:Adolescent; D002508:Cephalometry; D002648:Child; D003724:Dental Arch / Q000473:pathology; D004867:Equipment Design; D005115:Extraoral Traction Appliances; D005147:Facial Bones / Q000473:pathology*; D005260:Female; D006801:Humans; D008297:Male; D008310:Malocclusion / Q000628:therapy*; D008312:Malocclusion, Angle Class II / Q000628:therapy*; D009968:Orthodontic Appliances, Removable; D014087:Tooth Movement Techniques / Q000295:instrumentation*