A three-dimensional analysis of bone and soft tissue to bone ratio of movements in 17 Skeletal II patients following orthognathic surgery

• Published in: European journal of orthodontics 1993-04, Vol.15 (2), p.97-106
• Main Authors: McCance, A. M., Moss, J. P., Fright, W. R., James, D. R., Linney, A. D.
• Format: Article
• Language: English
• Subjects: Adaptation, Physiological; Adolescent; Adult; Cephalometry - methods; Dentistry; Face - physiopathology; Female; Humans; Male; Malocclusion, Angle Class II - physiopathology; Malocclusion, Angle Class II - surgery; Mandible - diagnostic imaging; Mandible - physiopathology; Maxilla - diagnostic imaging; Maxilla - physiopathology; Movement; Tomography, X-Ray Computed; Treatment Outcome
• ISSN: 0141-5387; 1460-2210
• DOI: 10.1093/ejo/15.2.97

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.