Digital diagnosis and treatment system for facial prostheses / 华西口腔医学杂志

Conventional diagnosis and treatment for facial prostheses have setbacks and limitations, including complicated procedure, inefficiency, low accuracy and poor esthetics, which could not meet the demand for high quality of the prostheses of the patients. With the technology of the computer aided design and computer aided manufacture (CAD/CAM), the new era for diagnosis and treatment for facial prostheses has been started since the 1990's. The digital diagnosis and treatment system for facial prostheses has been formed during these ten years, which including the digital data acquisition of the facial defect, CAD for facial prostheses, rapid fabrication of the prostheses. This new system will be the development direction and mainstream technology in the future.

Development of three dimensional facial measurement system based on structured light projection / 上海第二医科大学学报

Objective To construct a system for three dimensional face scanning and measurement. Methods The measurement system was based on the principle of triangulation and the combination of gray-code and phase-shift structured light projection. The system software was developed for Windows XP with the aid of tools such as Visual C++ and Hoops. Results A three dimensional measurement system based on structured light projection was developed. The system hardware was composed of fringe projection unit, image gathering unit, system control unit and mechanical appearance, and the system software was composed of point cloud display and editing module. The lamp house of the system was 12V, the working distance was 900 mm, the scanning time was 5.5 s and the scanning field was 500 mm×400 mm. Conclusion The three dimensional measurement system based on structured light projection is a refined machine with safe light to eyes, and the accuracy and scanning speed are suitable to face scanning.

A preliminary study on maxillofacial prosthesis using structured light three-dimensional scanning and rapid prototyping technique / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To evaluate application of three-dimensional reconstruction of the facial soft tissue by use of light three-dimensional scanning system and rapid prototyping and to lay a foundation for developing the computer aided design (CAD) and computer aided manufacture (CAM) system of the maxillofacial defect rehabilitation.</p><p><b>METHODS</b>The left and right facial profiles of a volunteer were scanned with the light three-dimensional scanning system that was a self-developed one. The complete point and cloud data were obtained by transforming the image data with the Surfcaq software. Then three-dimensional reconstruction was done via transforming the point and cloud data to Geomagic studio 7.0. The final three-dimensional reconstruction was achieved by way of putting the point and cloud data together with apex nasi, external point of the orbit, mention as the mark points. The image was imported into Magics RP to triangulate and created in the thickness of 2 mm. The three-dimensional resin model was fabricated by fused deposition modeling (FDM).</p><p><b>RESULTS</b>The three-dimensional image of the facial soft tissue of the volunteer was achieved. The three-dimensional resin model of the facial soft tissue of the volunteer was also obtained.</p><p><b>CONCLUSIONS</b>Light three-dimensional scanning system was feasible for three-dimensional reconstruction.</p>

A preliminary study on facial profile reconstruction using structured light three-dimensional scanning technique / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To evaluate the feasibility of facial profile reconstruction by use of structured light three-dimensional scanning technique.</p><p><b>METHODS</b>Based on Gray-code and phase-shifting method, the self-developed three-dimensional optical measurement system was used to acquire the primitive point data of a volunteer's face and cast of the face. All the datum records were processed and analysed with Imageware and Geomagic software to reconstruct a three-dimensional face model.</p><p><b>RESULTS</b>Compared with the conventional impression method, the structured light three-dimensional scanning technique reconstructed facial profile with smaller deformation.</p><p><b>CONCLUSIONS</b>Based on Gray-code and phase-shifting method, the self-developed optical measurement system captured three-dimensional facial profile accurately. It would be helpful to the three-dimensional reconstruction of the facial profile defect.</p>