the following equation was used for measuring the teeth on the xeroradiograph . alpha = root area supporting the existing alveolar bone/root area from periapical to c-e junction x 100 the root surface area of each of the teeth extracted from bone blocks and of the extracted teeth from patients were measured by the membrane technique and calculated as follows : beta = root surface area covered with periodontal ligament/root surface area x 100 there was no significant difference in equation alpha calculated on three types of xeroradiographs in the human skull .
C0040426
teeth
C0031093
periodontal