|Budget Amount *help
¥2,100,000 (Direct Cost : ¥2,100,000)
Fiscal Year 1998 : ¥700,000 (Direct Cost : ¥700,000)
Fiscal Year 1997 : ¥700,000 (Direct Cost : ¥700,000)
Fiscal Year 1996 : ¥700,000 (Direct Cost : ¥700,000)
(Objectives) The periodontal condition of 486 persons (1444 years old, 211 males and 276 females) in a rural area was monitored over a 2 year period in order to determine the clinical parameters that act as risk factors for attachment loss.
(Methods) Plaque and calculus accumulation (PSS and CI), modified gingival index (MGI), pocket depth (PD) and attachment level(AL) of two quadrants of each person were examined in 1992 and 1994. Following calculation of the mean of each of these parameters and statistical analysis of the change in each of the clinical parameters over the 3 year period, the relationship between attachment loss and clinical parameters was analyzed.
(Results) At the beginning of this study, the mean values for persons were 3.50 for PSS, 2.21 for CI, 1.53 for MGI, 2.58 mm for PD, 1.64 mm for AL. The mean of PD and AL tended to increase with age.
On the longitudinal analysis, PSS, CI and PD was no changed but AL was tended to increase.
(Conclusion) Attachment loss lended to increase with age, especially after 25 years old. Deep periodontal pocket (PD≧4mm) correlated with progression of attachment loss.