Prevalence of chronic periodontitis
a. The presence of periodontal disease
is measured clinically several ways. One way is to calculate loss of periodontal attachment. The loss of attachment is the term used to describe the destruction of connective tissues of parodentium and alveolar bone
that support the teeth. Figure 5-3 shows that investments loss of 4 mm or more affects approximately half of adults aged 50 to 59 .
B. Age from 60 to 69, less than half of the adult population in the USA has kept 21 teeth or more (Fig. 5-4) .
The prevalence of loss of fastening of 4 mm or more in age* and race/ethnicity