Craniofacial implants provide retention and excellent stability for orbital prosthodontic rehabilitation. The locations of implant placement in the orbital region for optimal prosthetic outcome are critical to detect. Objective: The purpose of this study was to establish a CT-based Computer-assisted Design System in order to perform preoperative analysis and planning for craniofacial implant positioning. Materials and Methods: Twelve adult skull specimens with templates were scanned by LightSpeed Ultra 8 multislice Spiral CT Scanner (GE) and the CT data was transmitted to the AW 4.0 CT workstation for reediting using Volume Analysis Voxtool 3.0 with MPVR. The study included the analysis of orbital bone structure, the methodology for 3D orbital image reconstruction, implant positioning design and fabricated orbital template. Results: The data extracted from Spiral CT scans and accurate reconstructive image can be used for preoperative design of orbital implant insertion. The quality and quantity of paries lateralis orbitae were much better than paries medialis orbitae. There were enough bone quantity (mean 13.1×4 mm³ and 15.9×4 mm³) at seven o'clock and eleven o'clock position on the right side of orbita than other locations. On the left side of orbita, however, there were bone quantity (mean 16.0×4 mm³ and 11.8×4 mm³ ) at one o'clock and five o'clock. The density of bone have no obvious difference between two sides of paries lateralis orbitae (P>0.05). The sector and cross section images of orbital bone can be provided the whole impression of orbital bone and 3D information. Conclusion: CT-based Computer-assisted Design System with orbital template technique can not only well evaluate the structure of orbital implanted region, but accomplish the preoperative precise design. It is also the base to further research for surgical safety of craniofacial implant placement.

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