Salivary conditions and cariogenic microorganisms in 55, 65, and 75‐year‐old Swedish individuals

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<jats:p><jats:bold>Abstract – </jats:bold> Secretion rate, buffer capacity, and cariogenic microorganisms of resting and stimulated whole saliva were examined in 208 55‐, 65‐, and 75‐yr‐old Swedes. The secretion rate for both resting and stimulated saliva decreased with age. When the use of drugs was taken into account the difference in terms of age group was significant for resting saliva alone (P<0.01). In 22%, the resting saliva was <0.1 ml/min, and in 5% the stimulated saliva was <0.7 ml/min. Persons with subjective dryness in the mouth had a lower salivary flow. Men had higher secretion rates than women irrespective of medication (P<0.05). The buffer capacity was strongly correlated to the secretion rate of both resting and stimulated saliva (r=0.39 and r=0.44, respectively). The number of mutans streptococci and lactobacilli increased with age, although significant in terms of age group for lactobacilli alone (P<0.05). The number of these microorganisms was lower in resting saliva than in stimulated saliva (P<0.0001). Individuals harboring both <jats:italic>Streptococcus mutans</jats:italic> and <jats:italic>Streptococcus sobrinus</jats:italic> had higher values of mutans streptococci in resting and stimulated saliva than those harboring only <jats:italic>S. mutans</jats:italic> (P<0.001). <jats:italic>Actinomyces viscosus</jats:italic> and <jats:italic>Actinomyces naeslundii</jats:italic> comprised 1% of the total CFU in 89% of the plaque samples. The corresponding figures for lactobacilli and mutans streptococci were 6% and 38%, respectively.</jats:p>

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