Murat Soncul1, Mohammad Anwar Bamber. 1. Department of Oral and Maxillofacial Surgery, Eastman Dental Institute, University College London, England.
Abstract
PURPOSE: To evaluate the soft tissue changes after correction of Class III dentoskeletal deformity with orthognathic surgery using the optical surface scanner as a 3-dimensional imaging tool and thin-plate splines as a morphometric analysis. PATIENTS AND METHODS: Forty-six patients with Class III dentoskeletal relationship who underwent a bimaxillary orthognathic surgical procedure involving advancement of the maxilla and mandibular setback to correct the deformity and create a Class I dentoskeletal relationship were included. Optical surface scans (lasergraphs) were obtained from all patients preoperatively and 6 months postoperatively. They were evaluated for the soft tissue changes 3-dimensionally and on the profile line. The cephalographs taken pre- and postoperatively were digitized and evaluated using the CogSoft digitizing software (Consultant Orthodontists Group Software, Bristol, United Kingdom) to confirm whether the preoperative surgical plan was applied. RESULTS: The soft tissue change in different areas of the face ranged from 30% on the nasal tip to 80% on subnasale and from 50% on subcomissural region corresponding to lateral parts of the mandibular body to 100% on the pogonion. The direction of soft tissue movement was not solely forwards and backwards on a horizontal plane but had upward and downward vectors. CONCLUSIONS: The soft tissue changes following orthognathic surgery depend on various factors; hence it can be difficult to predict. However, there is a general trend as discussed in this study for the direction and amounts of facial soft tissue changes in the middle and lower facial thirds.
PURPOSE: To evaluate the soft tissue changes after correction of Class III dentoskeletal deformity with orthognathic surgery using the optical surface scanner as a 3-dimensional imaging tool and thin-plate splines as a morphometric analysis. PATIENTS AND METHODS: Forty-six patients with Class III dentoskeletal relationship who underwent a bimaxillary orthognathic surgical procedure involving advancement of the maxilla and mandibular setback to correct the deformity and create a Class I dentoskeletal relationship were included. Optical surface scans (lasergraphs) were obtained from all patients preoperatively and 6 months postoperatively. They were evaluated for the soft tissue changes 3-dimensionally and on the profile line. The cephalographs taken pre- and postoperatively were digitized and evaluated using the CogSoft digitizing software (Consultant Orthodontists Group Software, Bristol, United Kingdom) to confirm whether the preoperative surgical plan was applied. RESULTS: The soft tissue change in different areas of the face ranged from 30% on the nasal tip to 80% on subnasale and from 50% on subcomissural region corresponding to lateral parts of the mandibular body to 100% on the pogonion. The direction of soft tissue movement was not solely forwards and backwards on a horizontal plane but had upward and downward vectors. CONCLUSIONS: The soft tissue changes following orthognathic surgery depend on various factors; hence it can be difficult to predict. However, there is a general trend as discussed in this study for the direction and amounts of facial soft tissue changes in the middle and lower facial thirds.
Authors: Claudia Sade Hoefert; Margit Bacher; Tina Herberts; Michael Krimmel; Siegmar Reinert; Sebastian Hoefert; Gernot Göz Journal: J Orofac Orthop Date: 2010-05-26 Impact factor: 1.938