| Co-Investigator(Kenkyū-buntansha) |
TANAKA Muneo Osaka University, Dental Hospital, Assistant Professor, 歯学部附属病院, 講師 (90263300)
HAYASHI Naoji Osaka University, Dental Hospital, Research Associate, 歯学部附属病院, 助手 (10303984)
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| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2005: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2004: ¥2,600,000 (Direct Cost: ¥2,600,000)
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| Research Abstract |
Video image has an advantage of recording much amount of information. The aim of the present study was to develop a system for automatic data collection of periodontal status using video images. The system consisted of a handpiece-type intra-oral charge coupled device (CCD) camera, a video capture board and a computer for image analysis. Intra-oral video images of seven participants were taken during periodontal examination. Camera position and angle were investigated for acquisition. Labial (buccal) and lingual views of six representative teeth (FDI code,16,21,24,36,41 and 44) were extracted from the video images with resolution of 640x480 pixels. All images were processed using a proposed program. The calculated values were compared to measurements by inspection of an expert dentist. The value of pocket depth, gingival inflammation and plaque accumulation were expressed as a distance between gingival margin and the bottom of pockets, the percentage of swelling area in the gross area of papilla and the percentage of disclosed plaque area in the tooth surface, respectively. Pocket depth, gingival index and plaque index were also measured by inspection of dentists. Measurements of labial and buccal sites were more reliable than these of lingual sites. Range of the value of gingival index in score 0,1 and 2 were 23.9-32.2%,27.8-39.6% and 25.2-47.5%, respectively. Range of the value of plaque index in score 0,1,2 and 3 were 0.8-3.2%,1.8-22.2%,16.3-48.0% and 51.2-84.6%, respectively. The quantification results correlate well with the results obtained through visual inspection. These results suggested that this newly system using video images facilitates assembling data of periodontal status. Further research is needed on application to mass screening examination and collecting of epidemiological data.
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