Application Study Of3-Dimensional Reconstruction Technology Of Spiral Computerized Tomography In Mandibular Deformity Plastic

Objective: To explore the application of3-Dimensional Reconstructiontechnology of Spiral Computerized Tomography in the reshaping of mandibulardeformity. To observe the relevant datas of the mandibular osteotomy line on bothsides of preoperation and the deformity side of postoperation which were measuredby3-Dimensional reconstruction technology， and compare the correlation betweenthem，providing the imaging basis for accurately excising the excess bone.Methods： The maxillofacial datas of nine patients with mandible deformitiesmesasuered by CT scanning were sent to the Wizard image processing workstationsin the16layer spiral CT of Siemens company. By using the relative softwares ofWizard,3-dimensional model of head was reconstructed. In the model of3-Dimensional reconstruction, measure the height of mandibular ramus of both sidesand the vertical distances from bilateral mandibular of the second premolar, the firstmolar, the second molar to mandible inferior margin separately before operation. Thenormal side as the control, the osteotomy line was designed according to thedifference between the measured datas. The excess bone mass of deformed side wasaccurately amputated in the operation. Postoperation, another3-Dimensional modelof mandible was established again. The vertical distances from bilateral mandibularof the second premolar, the first molar and the second molar separately to mandibleinferior margin, and the length of mandibular ramus were measured. Then carry onthe correlational analysis on these datas.Results： Compared with the normal side preoperation, there were significantdifferences between the distance from bilateral mandibular of the second premolar,the first molar and the second molar to mandible inferior margin separately, and theheight of mandibular ramus in the deformity side (P<0.05). Same as the differences inthe distance of the deformity side between before and after surgery (P<0.05). Therewas no significant differences between the mandible of the normal side beforeoperation and the deformity side after operation (P>0.05).Conclusions:1. Precisely positioning measuring the mandibular teeth can accurately determine the deformed parts and provide a new measuring method andidea for mandibular deformity plastic. The method of this measurement is simple tooperate and easy to promote.2. The full-length marginal mandibular osteotomy can effectively excising theexcess bone, including chin, mandibular body and mandibular angle, which can makethe facial contour curve more graceful.3. The most significant difference of the osteotomy line are the second premolarand mandibular ramus.4. Using3-Dimensional reconstruction technology of Spiral ComputerizedTomography can accurately measure the excess bone, improve the safety of surgeryand achieve the planned anticipated effect of preoperation.