A STUDY OF THE ACCURACY OF PREDICTED SOFT-TISSUE CHANGES PRODUCED BY A COMPUTER SOFTWARE PACKAGE (COG-3.4) IN A SERIES OF PATIENTS TREATED BY THE LEFORT-I OSTEOTOMY
Ea. Eales et al., A STUDY OF THE ACCURACY OF PREDICTED SOFT-TISSUE CHANGES PRODUCED BY A COMPUTER SOFTWARE PACKAGE (COG-3.4) IN A SERIES OF PATIENTS TREATED BY THE LEFORT-I OSTEOTOMY, British journal of oral & maxillofacial surgery, 33(6), 1995, pp. 362-369
This study was performed to compare soft tissue movements resulting fr
om a series of Le Fort I osteotomies with those predicted for the same
cases by means of a computerised software package (COG 3.4), The sour
ce material consisted of serial lateral cephalometric radiographs for
25 consecutive patients that had received similar Le Fort I osteotomie
s primarily to correct an antero-posterior skeletal discrepancy. Gener
ally it was found that many of the digitised points on the facial prof
ile were surprisingly well predicted, In addition, the chin and profil
e changes resulting from mandibular auto-rotation also were reasonably
well predicted, However, in a number of cases prediction was less con
sistent and this was particularly true in the region of the nose and l
ips, In such instances, initial size, thickness and the existing morph
ology of the soft tissues appeared to be important factors, The tenden
cy of the software occasionally to 'cross-over' the plots for the uppe
r and lower lip profile made the judgement in this area of predicted p
rofile change difficult in some cases,