| Co-Investigator(Kenkyū-buntansha) |
MIZUKAWA Nonbuyoshi Okayama University Hospital of Dentistry, Lecturer, 歯学部附属病院, 講師 (00263608)
MISHIMA Katsuaki Okayama University Hospital of Dentistry, Lecturer, 歯学部附属病院, 講師 (60304317)
KAWAMOTO Tomoaki Okayama University Graduate School of Medicine and Dentistry, Assistant, 大学院・医歯学総合研究科, 助手 (00325119)
YAMADA Tomohiro Okayama University Graduate School of Medicine and Dentistry, Assistant, 大学院・医歯学総合研究科, 助手 (60335619)
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| Research Abstract |
We established the operation method of total replacement of artificial temporomandibular (TMJ) joint made from polyethylene titanium, and developed originality, have proved its functionality and its safety in clinical. And the fundamental form was used as the same ready-made type although the size of each artificial TMJ joint was different so that this developed artifivial TMJ joint could respond to the disease of various TMJ joints namely. However, it was pressed for the artificial TMJ joint which might encounter the case which arficular fossa made from polyethylene is fully fitted and canned install it easily depending on the form of a patients TMJ joint, and was adapted for the form of patient each by the necessity of designing and producing For this reason, using 3DCAD software, from the data which traced a patients CT image, 3D reconstruction of a TMJ part was performed, the artificial TMJ joint was designed on the image, and the method of producing the artificial TMJ joint by car
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ving was developed using CAM. However, since the 3D image construction by this method had complicated work, it built the 3D image directly from the DICOM data obtained at the time of CT image using 3D image construction software. Furthermore, the artificial TMJ joint produced on the picture appreciated, stress analysis at the time was performed using the 3D finite element method, and the durability and safety were checked. Moreover, in order to verify the reliability of this analysis load displacement curve was examined as compared with the value of an actual destructive examination and computer simulation, and the reliability was verified. The design of the artificial jaw joint in CAD and CAM and the outline of the producing method are as follows. Only the required part was taken out and it changed into the parasolid file, after taking CT image of the circumference of a jaw joint and building the obtained 3D DICOM data. The file was inputted to 3DCAD, it changed into the solid model, and the field data of a TMJ joint part was obtained. Artificial mandibular fossa and the artificial mandibular condyle head were created on 3DCAD based on the field data of a temporomandibular joint part. Total replacement of the TMJ joint model was created assembling each model, it appreciated using 3D stress analysis software, stress analysis at the time was performed and the durability of an artificial jaw joint and safety were checked. The data on 3DCAD of created artificial mandibular fossa and the artificial lower mandibular head was inputted to 3DCAM, the carving instrument was interlocked, the block of each material was carved and produced, and conformity was checked. Less
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