Treatment outcome in orthognathic surgery - A prospective comparison of accuracy in computer assisted two and three-dimensional prediction techniques.
The main objective of the present study was to assess the accuracy of two- and three-dimensional prediction techniques in orthognathic surgery. It was also a test of the very planning sequence. The scientific question was how well does the software support the surgeon in his way to find the perfect correction of the facial appearance while normalizing the occlusion? Thirty patients with a class III occlusion were included in this prospective study. Surgical planning with both techniques were undertaken for all patients. Surgery was performed according to the two-dimensional technique. The cephalometric measurements from two-dimensional and three dimensional predictions were compared with the postoperative results at the 12 months follow-up respectively. Together with an analysis of tracing error, placements of 2020 markers, 1860 measurements and 1280 comparisons was performed. The analysis showed an equally high accuracy for the studied techniques. The highest accuracy was found in the anterior maxilla. There was a tendency for an overestimation for the three-dimensional technique and an underestimation for the two-dimensional technique. CONCLUSIONS: The present study indicates an equal high accuracy in predicting facial outcome for both studied techniques. However, in those patients with asymmetric malocclusion and/or facial appearance the three-dimensional technique has an obvious advantage.
Department of Oral & Maxillofacial Surgery, The University Hospital of Skåne, S-22185 Lund, Sweden. Electronic address: martin.n.bengtsson@skane.se.
Martin
M
Bengtsson
Department of Oral & Maxillofacial Surgery, The University Hospital of Skåne, S-22185 Lund, Sweden.
Gert
G
Wall
Department of Oral & Maxillofacial Surgery, The University Hospital of Skåne, S-22185 Lund, Sweden.
Patricia
P
Miranda-Burgos
Department of Oral & Maxillofacial Surgery, The Sahlgrenska Academy, Gothenburg University, Box 450, S-40530 Gothenburg, Sweden.
Lars
L
Rasmusson
D000293:Adolescent; D000328:Adult; D002508:Cephalometry / Q000379:methods; D006801:Humans; D021621:Imaging, Three-Dimensional; D008313:Malocclusion, Angle Class III / Q000000981:diagnostic imaging / Q000601:surgery; D008437:Maxilla / Q000000981:diagnostic imaging; D056948:Orthognathic Surgical Procedures / Q000379:methods*; D011446:Prospective Studies; D015203:Reproducibility of Results; D025321:Surgery, Computer-Assisted / Q000379:methods; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome; D055815:Young Adult
Cephalometry; Orthognathic surgery; Prediction; Three-dimensional; Two-dimensional; Virtual surgery simulation