Medical robot is under development in all around the world actively. In development of medical robot, needs of medical doctor is considered for potential solutions and good robots are created by seeds of engineering technology. Bio-inspired mechanism, such as robotic fish, becomes good seeds of technology. The author shows the developed surgical instruments and rehabilitation robots by bio-inspired mechanisms. Also, seamless design and manufacturing methods by 3D-CAD and 3D printer firstly in the world are mentioned. In the future, development of automated medical robot is integrated with IoT technology, however, it is significant to develop it as a medical support tool for medical doctors. Advanced medical robot and mechatronics are developed by considering easiness to be used for medical doctor and geniality to patients. Specially, bio-inspired mechanisms create new technologies for medical robot and mechatronics. The technology implements for not only university hospital and large hospital but also private hospital and clinic, which are facing day-to-day familiar medical field.

Purpose: This study aimed to verify the thickness detectability of our evaluation system using a dental scanner (D900) for the occlusal facets on sleep splints.

 Materials and Methods: First, the accuracy of the D900 was investigated via a multi sphere test. Surface roughness, diameter, and distances among centers in three SUJ2 stainless spheres were investigated. Then, the thickness detectability of our evaluation system was investigated using gauge blocks. The ceramic gauge blocks were located on a flat stone board, and then were scanned and superimposed on a flat-surface CAD model used as a reference plane. The distance between the scanned surface of each gauge block and the reference plane were calculated. Finally, to evaluate the performance of our system in a clinical setting, a 35-year-old female volunteer who was aware of sleep bruxism was recruited. The differences in vertical heights between images of two models (before and after applying the splint) were investigated.

 Result: The relative errors of diameter (0.154%) were significantly bigger than that of distance among three spheres (0.01%) because of powder coating. The D900 can produce high accuracy 3D scanning if powder coating is not required, completely distinguish the thickness difference of 10 μm of gauge block. As our evaluation system detects changes in the splint surface by comparing surface profile between two stone model before and after splint wearing, it is considered that the minimum detectable thickness of our system is approximately 50 μm, because it is affected by the surface roughness of both two stone model. Not only the wear facet on splint but also the deformation of splint was caused by excessive occlusal force after 14days applying. It was considered that the palate region was an appropriate region of interest (ROI) for registration to evaluate the whole deformation and fit of the splint. To evaluate the occlusal facets, the surface of the splint region was an appropriate ROI. We were able to detect the occlusal facets using our evaluation system.

 Conclusion: It was revealed that our system can detect differences of approximately 50 μm in thickness. It was suggested the appropriate ROI for registration should be selected depending on analytical parameters. Our system can detect the occlusal facets on the surface of splint after 14days applying.