498 Free Papers—Oral Presentations Methods: A patient with facial asymmetry which is originated from a large, square, or broad mandible on one side can be cor- rected by contouring the mandible. One of the most effective methods to reduce the width of the lower face is ostectomy of the lateral cortex around the mandibular angle. Results: We operated patients of facial asymmetry, especially, with wide low-face width on one side and ostectomy of the lateral cortex of the mandible was mainly used with other aesthetic surgery. Postop- erative results were satisfactory in all cases. Conclusion: We propose that ostectomy of the lateral cortex of the mandible is an effective and safe method for contouring mandible. doi:10.1016/j.ijom.2009.03.362 O10.7 Application of rapid prototyping and repositioning guide plate in treatment of posttraumatic orbitozygomatic deformity J. An * , Y. Zhang, J. He Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology, Beijing, China Background and Objectives: Orbitozygo- matic complex is most common fracture site in midfacial region. Any delayed or inappropriate treatment leads to facial deformity. Comminuted fractures and those with bony lose could cause more severe secondary deformity. Correction of such deformity is quite challenge- able to surgeons because of no anatomic landmarks for fractures reduction. In this paper, one method was introduced to use three-dimensional (3D) resin skull model and repositioning guiding plate for rectification of orbitozygomatic deformity. Methods: 5 cases (4 males and 1 female) with severe posttraumatic orbitozygomatic deformity were included in the series. The time interval form injury to treatment was 10 months to 4 years. Before surgey, each patient underwent computed tomography (CT) scan. Two 3D resin skull models were produced by using rapid prototyp- ing technique. The first model was the patient’s original model and the second was the reshaped model by mirroring the unaffected facial side onto the traumatic side. The original model was used for measurement of the fracture displacement in three directions and model surgery. On the second model, one 2.0 miniplate (Syn- thes Inc.) was bended along the orbital rim which was prepared to be an intraoperative guide plate. Two holes at both end of the plate should remain. A principle surgical procedure was applied as below: 1) guided by prepared repositioning guide plate, osteotomy and reduction of zygomatic and periorbital fractures was performed; (2) use individualised titanium mesh to recon- struct internal orbit; and 3) bone grafting to rebuild the continuity of orbital rim and wall. Coronal, subciliary and intraoral incision for approach. The malpositioned zygomatic bone and arch was refractured and released completely. Based on pre- operative design, the positioning guide plate was placed and adjusted referring to preoperative measurement of malar bone and arch displacement. Both ends of the plate were fixed with screws, and then the malar bone and arch was reduced and fixed under the titanium plate. Graft was harvested for orbital rim defects from outer plate of cranial bone. The custom titanium mesh was implanted to reconstruct orbital walls. One week after surgery, a CT scan was taken and the result of surgery was evaluated. Results: Facial symmetry was obtained postoperatively. The shape and location of zygomatic bone and arch was good. There was no infection or graft extrusion in all patients after operations. Conclusion: Application of rapid proto- typing technique and positioning guide plate can provide successful results in the treatment of complex orbitozygomatic traumatic deformity. doi:10.1016/j.ijom.2009.03.363 O10.8 Digital craniomaxillofacial plastic and reconstructive surgery X. Gu * , P. Xu, Q. Zhang, X. Li, C. Liu, Q. Jiang Center of Stomatology, General Hospital of CPAPF, Hai Dian District, Beijing, China Background and Objectives: Digital craniomaxillofacial plastic and recon- structive surgery, a modern comprehensive pre-surgery, aims to repair the compli- cated craniomaxillofacial defect with customarily implant well adapted to patient by means of computed tomog- raphy (CT)/magnetic resonance (MR), computer-aided design/computer-aided manufacturing (CAD/CAM), rapid proto- typing, mirror technique, new material, and to reach symmetric and well-proportional reconstruction. This paper introduces the technique by case report of 7 patients. Methods: Seven patients were treated with digital craniomaxillofacial plastic and reconstructive technique since July, 2006. There were 4 males and 3 females. The mean age was 25.6 years (between 18.7 and 35.6 years). The established craniomaillo- facial deformities (asymmetric ones) were caused by extensive ablation of tumour (2 cases), by severe trauma (3 cases). One case was congenital deformity, another underdevelopment is due to radiotherapy. The bone defect includes frontal, tem- poral, zygoma, mandible, orbital ridge, roof and floor. According to the princi- ple of reversed engineering, original CT data was collected firstly. Then construct three-dimensional image of skull at work station. The substitute was designed by mirror technique thirdly. The forth step is to manufacture a resin skull model and part by rapid prototyping. After mimic operation on the model, the implant of pure titanium was made by CAM. At last, the implant was assembled through proper approach. Results: All of 7 patients satisfied their reconstructive results. One patient suffered midfacial defect was repaired with digi- tal implant for the defect of zygoma and orbital floor, a fibular osteocutaneous flap for the defect of maxilla and palate, and a forearm flap for the contraction of midface. But the ischemia happened in forearm flap during 48 hours post-operation because his unreasonable position. A deltopectoral flap was immediately used to replace. The sal- vage operation was success. Conclusion: The customised digital implant has many advantages, such as great accuracy, well adaptation of defect surface, simplified the operation, min- imised the operative trauma, shortened the in-hospital time, and excellent sym- metric reparation. Long-term follow-up is however needed. doi:10.1016/j.ijom.2009.03.364 O10.9 Techniques in the surgical correction of facial asymmetry following condylar dysmorphogenesis D.P. Tauro Department of Cranio-Maxillofacial, Plastic and Reconstructive Surgery, College of Dental Sciences and Hospital, SS Institute of Medical Sciences and Research Centre, Davangere, Karnataka, India Condylar dysmorphogenesis poses an array of problems both in terms of aes- thetics and function. It can occur as a