2-Year observation of attachment loss in a rural Chinese population

Background: Risk indicators for periodontitis seem to vary with study popul ation. The purpose of this study was to determine whether risk indicators o f additional attachment loss differ between generations of Chinese villager s in a rural area of China over a 2-year period. Methods: The study population consisted of 310 subjects aged 15 to 44. In e ach subject, 2 quadrants from either the upper or lower jaw were randomly s elected and 6 sites on each tooth were examined. Clinical parameters includ ed plaque scoring system (PSS), calculus index (CI), probing depth (PD), at tachment level (AL), and sulcus bleeding index (SBI), The second examinatio n was done 2 years after the first. Results: In the 15- to 24-year-old age group, mean PSS, CI, and SBI were si gnificantly higher in subjects with additional attachment loss 23 mm (AL+) than in those without attachment loss (AL-), In the 25- to 34-year-old age group, mean PD was significantly higher in AL+ than in AL-, and mean PD and AL were significantly higher in AL+ than in AL- in the 35- to 44-year-old age group. Although the number of subjects with AL+ increased with age, the mean number of sites with AL+ per subject did not differ by generation. In addition, smokers tended to exhibit attachment loss more often than non-sm okers. Conclusions: The present results suggest that the clinical parameters assoc iated with attachment loss differ between generations and that gingival inf lammation is likely associated with the onset of periodontitis more strongl y than progression of periodontitis, whereas PD and/or AL are associated wi th the progression of periodontitis.