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Relationship between bacterial counts, microbial vitality and the accumulation of supragingival dental plaque in humans
Author(s) -
Weiger R.,
Netuschil L.,
Brecx M.
Publication year - 1992
Publication title -
journal of periodontal research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.31
H-Index - 83
eISSN - 1600-0765
pISSN - 0022-3484
DOI - 10.1111/j.1600-0765.1992.tb01739.x
Subject(s) - dental plaque , oral hygiene , dentistry , medicine
Comparisons between plaque index (PII) and bacterial counts have been made already; however, these did not take into account the area used for plaque sampling. The objective of the present study was to determine the correlation between the PII score, the number of bacteria and the bacterial plaque vitality when dental plaque was repeatedly sampled from the same area in each subject during early plaque accumulation. Between intervals of optimal oral hygiene, 10 participants refrained from all oral hygiene measures for periods of 1, 2, 3, 4 and 5 days. The PII was recorded on the vestibular surface of all first premolars as local PII:LS. For statistical reasons, the scores of the independent variable LS were added for each subject giving LS* values ranging from 0 to 8. The plaque sampled from this specific surface was circumscribed by the marginal gingiva and an acrylic splint, giving reproducible areas for plaque collection. Total microscopic bacterial counts (BC), colony forming units of anaerobes (CFU an ) and aerobes (CFU ae ), and proportions of vital bacteria (VF) were compared with LS* values. BC and LS* values were strongly correlated. CFU an and CFU ae increased significantly with LS*, but this increase was higher for LS* 0 to 4 than for LS* 4 to 8. The ratio between vital and dead microorganisms, assessed by two different methods, was low when an LS* of 0 was recorded, with higher ratios registered for LS* values 4 and 8.