The tooth lap compilation method of flame index, that compilation device, that compilation program, record medium and the tooth which record this lap diagnostic method of the flame, that diagnostic device, that diagnosis program and the record medium which records this

摘要

The sample attachment level (M) of each tooth is measured in a plurality of tooth samples taken per tooth type from a plurality of teeth extracted as unconservable teeth. A lost periodontal membrane area (S L ) is calculated based on the sample attachment level (M) and a total periodontal membrane area (S). A bite force coefficient (B) different according only to each tooth type, which reflects the bite force of each tooth, is found. The relation between the bite force coefficient (B) and a lost periodontal membrane area (S LB ) at the time of loss of each tooth is statistically processed for each tooth type, and a linear equation showing the relation between the bite force coefficient (B) and the lost periodontal membrane area (S LB ) at the time of loss of each tooth is prepared by use of the presence of a linear relation between both parameters. (Remaining periodontal membrane area (S SB )/total periodontal membrane area (S))X 100(%), where the remaining periodontal membrane area (S SB ) takes bite force into consideration and which is determined based on the lost periodontal membrane area (S LB ) at the time of loss of the tooth, is calculated as a periodontal index BPI representing the severity of progression of periodontitis.