PERIODONTAL INDEX CREATION METHOD, PERIODONTAL INDEX CREATION APPARATUS, PERIODONTAL INDEX CREATION PROGRAM, AND RECORDING MEDIUM HAVING RECORDS OF PERIODONTAL INDEX CREATION PROGRAM, AND PERIODONTITIS DIAGNOSIS METHOD PERIODONTITIS DIAGNOSIS APPARATUS, PERIODONTITIS DIAGNOSIS PROGRAM, AND RECORDING MEDIUM HAVING RECORDS OF PERIODONTITIS DIAGNOSIS PROGRAM
The present invention includes calculating a lost periodontal membrane area (SL) based on a sample attachment level (M) and a total periodontal membrane area (S), wherein the sample attachment level (M) of each tooth is measured after a plurality of tooth are sampled for each tooth type , with respect to a plurality of teeth which can not be conserved and have been extracted . Furthermore, the relation between the bite force coefficient (B) which is different only due to tooth type and reflects the bite force of each tooth, and a lost periodontal membrane area (SLB) 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 (SLE) 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 (SSB) /total periodontal membrane area (S)) × 100 (%), is calculated as a periodontal index BPI representing the severity of progression of periodontity.本發明係將不能保留而被拔牙之複數根牙齒作為對象,依據依各牙齒種類分別抽出複數根所測定之各牙齒的樣本附連高度(M)、及總齒根模面積(S)來算出喪失齒根模面積(SL)後,再將經反映各牙齒的咬合力之僅因各牙齒種類而相異之咬合力係數(B)、與各牙齒之喪失時的喪失齒根模面積(SLB)之間的關係依各牙齒種類進行統計處理,利用此時兩者之間存有直線式關係之事實,以作成表示咬合力係數(B)、與牙齒之喪失時的喪失齒根模面積(SLB)之間的關係之直線的數式,將根據前述牙齒之喪失時的喪失齒根模面積(SLB)所求出之(摻加有咬合力之殘存齒根模面積(SSB)/總齒根模面積(S))×100(%),作為表示牙周炎的進行程度之牙周炎指標BPI加以算出。10‧‧‧演算處理部10A‧‧‧齒根模面積演算手段10B‧‧‧咬合力係數演算手段10C‧‧‧直線作成手段10D‧‧‧喪失時喪失齒根模面積檢測手段10E‧‧‧喪失時牙周炎指標演算手段10F‧‧‧牙周炎指標作成手段11‧‧‧輸入裝置12‧‧‧輸出裝置
