A three-dimensional analysis of bone and soft tissue to bone ratio of movements in 17 Skeletal II patients following orthognathic surgery.
The three-dimensional changes in the bone and the ratio of soft tissue to bone movement were investigated in a group of 17 Skeletal II patients following orthognathic surgery. CT scans were taken for each patient pre-operatively and 1 year post-operatively. The scans were superimposed, radial measurements calculated, and the changes illustrated by two separate colour scales. There was a constant ratio of movement over the maxillae with the central part of the upper lip being moved in a 1:1 ratio, increasing to a 1.25:1 ratio over the canine regions and 1.5:1 ratio over the paranasal areas. In the mandible there was a constant ratio of 1.25:1 over the chin, mentalis, and canine regions bilaterally. The ratio reduced to 1:1 over the body of the mandible.
McCance
A M
AM
University College Dental Hospital, London.
Moss
J P
JP
Fright
W R
WR
James
D R
DR
Linney
A D
AD
D000222:Adaptation, Physiological; D000293:Adolescent; D000328:Adult; D002508:Cephalometry / Q000379:methods*; D005145:Face / Q000503:physiopathology; D005260:Female; D006801:Humans; D008297:Male; D008312:Malocclusion, Angle Class II / Q000503:physiopathology / Q000601:surgery*; D008334:Mandible / Q000000981:diagnostic imaging / Q000503:physiopathology; D008437:Maxilla / Q000000981:diagnostic imaging / Q000503:physiopathology; D009068:Movement; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome