3D Reconstitution of Dentition by Laser Triangulation Under Structured Lighting

The accurate acquisition of the patient dentition is a very important step in orthognathic surgery since it permits to determine the occlusal position in order to prepare the operation. Classical methods for dental acquisition do not give a fast, accurate and low cost solution. Moreover, orthognathic surgery requires accurate registration with CTscan images, which is difficult with state of the art systems, as dental fillings destroy the CT scan images. This paper presents an approach improving simulation and planning techniques by applying the laser triangulation technology in the field of maxillo-facial surgery or dental implants. The originality is found in the combination of the laser scanning technique with a specific double bite wafer and a rigid registration method. The scanner calibration, registration method and tests of impression material are presented, as well as a first validation.