Three-dimensional analysis techniques--Part 4: Three-dimensional analysis of bone and soft tissue to bone ratio of movements in 24 cleft palate patients following Le Fort I osteotomy: a preliminary report.
The three-dimensional changes in the bone and the ratio of soft tissue to bone movement were investigated in a group of 24 cleft palate patients following Le Fort I osteotomy. CT scans were taken for each patient preoperatively and 1 year postoperatively. The scans were superimposed, radial measurements calculated, and the changes illustrated by two separate color scales. In all of the groups, there was a fairly consistent pattern of movement over the mandible. The soft tissues moved in a 1.25:1 ratio over the chin and canine regions, and reduced to 1:1 over the body. In the maxilla, there was a 1:1 movement in the midline increasing to 1.25:1 bilaterally over the alar bases for both the bilateral clefts and clefts of the secondary palate groups. In the unilateral cleft group, however, there was a greater degree of movement over the cleft than over the noncleft side.
McCance
A M
AM
East Grinstead Orthodontic Centre, West Sussex, United Kingdom.
Moss
J P
JP
Fright
W R
WR
Linney
A D
AD
James
D R
DR
Coghlan
K
K
Mars
M
M
D000293:Adolescent; D002508:Cephalometry / Q000379:methods*; D002680:Chin / Q000473:pathology; D002971:Cleft Lip / Q000000981:diagnostic imaging / Q000601:surgery; D002972:Cleft Palate / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery*; D003116:Color; D003481:Cuspid / Q000473:pathology; D003724:Dental Arch / Q000473:pathology; D005145:Face / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D005147:Facial Bones / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D007834:Lasers; D008297:Male; D008334:Mandible / Q000473:pathology; D008437:Maxilla / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery*; D019340:Osteotomy, Le Fort; D010159:Palate / Q000473:pathology; D014057:Tomography, X-Ray Computed