Dento-maxillary three-dimensional image using cross-sectional tomography

Research Project

Project/Area Number	06671895
Research Category	Grant-in-Aid for General Scientific Research (C)
Allocation Type	Single-year Grants
Research Field	病態科学系歯学(含放射線系歯学)
Research Institution	Asahi University
Principal Investigator	FUJISHITA Masami Prof.Dept.of Oral Radiol.Asahi Univ.School of Dent., 歯学部, 教授 (50028809)
Co-Investigator(Kenkyū-buntansha)	MORI Keisuke Manager, Engineering Development Dept, Japan Morita co., 技術開発部, 課長 KAWAMATA Akitoshi Resarch Associate, Dept.of Oral Radiol.Asahi Univ.School of Dent., 歯学部, 助手 (30195143)
Project Period (FY)	1994 – 1995
Project Status	Completed (Fiscal Year 1995)
Budget Amount *help	¥2,000,000 (Direct Cost: ¥2,000,000) Fiscal Year 1995: ¥400,000 (Direct Cost: ¥400,000) Fiscal Year 1994: ¥1,600,000 (Direct Cost: ¥1,600,000)
Keywords	tomography / dental / three-dimensional (3D) image
Research Abstract	The purpose of this study is to create the three-dimensional (3D) reconstructed image using multi-layr cross-sectional tomography of Jaw and/or tooth arch. Firstly, to obtain the cross-sectional image which is fit to 3D reconstruction, we investigated how much the horizontal x-ray beam direction affected the crosssectional image of the mandibular molar region. As a result of studies, following technique were used to find a best x-ray beam direction and to create the 3D image. 1 : As a orientation, five or more images of each mandibular region are taken with digital changes in the horizontal x-ray beam direction. 2 : A x-ray beam direction is chosen using the sharpness of cortical bone and the area of cross-cut jaw bone as the criteria. 3 : Serial cross-cut images are taken in the corrected x-ray beam direction. 4 : The images are digitized by a scanner and reconstructed to a 3D image. This 3D image may useful to the endosseous implant treatment.