INFLUENCE OF DIFFERENT MANUFACTURING TECHNIQUES AND MATERIALS ON THE ACCURACY OF ANATOMICAL SFF MODELS DERIVED FROM CT DATA

摘要

Computerized Tomography (CT) and Magnetic Resonance Imaging (MRI) are gold standards for cross-sectional images of the human body. Furthermore, several images reformatting softwares have been developed in order to assist pre-operating diagnosis and treatment planning. These softwares offer the possibility to interface scanning equipments with Solid Free-form Fabrication (SFF) systems, to build a custom made replica of the anatomical site. Selective Laser Sintering (SLS) and Sterolitography (SLA) manufacturing techniques are two kinds of SFF processes that produce physical models through a selective solidification of a variety of fine powders and liquids. SLS and SLA technologies are getting a great amount of attention, particularly in oral and maxillofacial surgery. When applying 3-D medical models to clinical cases, model accuracy is a major concern. We investigate the influence of different SFF manufacturing techniques and materials on the shape accuracy of anatomical models, derived from CT acquisition of a dry mandible, using full-field measurement system such as fringe projection techniques. The application of such a method, allows for objective decisions regarding the precise location of bony anatomical landmarks.