The influence of extraction and nonextraction orthodontic treatment on brachyfacial and dolichofacial growth patterns.
The effects of extraction and nonextraction orthodontic treatment mechanics on patients with dolichofacial and brachyfacial growth patterns between one and two standard deviations were studied. Groups underwent treatment of either nonextraction or extraction of four premolars with the appropriate mechanics for the facial type. Changes in the facial axis and correlation between maxillary molar movement and facial axis change were measured. A positive correlation was found between the amount of anteroposterior movement of the upper molar and change in the facial axis in brachyfacial and dolichofacial patients undergoing nonextraction treatment. A weak correlation was found in the extraction treatment groups. No statistically significant difference was found in the facial axis change among any of the groups studied, regardless of facial type or plan of treatment. There were indications of a more severe opening of the facial axis (Ba-Na plane to constructed gnathion) with greater degrees of maxillary molar distal movement in both facial patterns studied.
Klapper
L
L
Department of Orthodontics, Loyola University School of Dentistry, Maywood, Ill.
Navarro
S F
SF
Bowman
D
D
Pawlowski
B
B
D000293:Adolescent; D002508:Cephalometry; D002648:Child; D003724:Dental Arch / Q000473:pathology; D005145:Face; D006801:Humans; D008297:Male; D008334:Mandible / Q000473:pathology; D008445:Maxillofacial Development; D008963:Molar / Q000473:pathology / Q000601:surgery; D012690:Serial Extraction; D014087:Tooth Movement Techniques / Q000379:methods; D014716:Vertical Dimension