Influence of short-term sucrose exposure on plaque acidogenicity and cariogenic microflora in individuals with different levels of mutans streptococci.
The aim was to study the short-term effect of a varying sucrose exposure on plaque acidogenicity and cariogenic microflora in two groups of subjects with different levels of mutans streptococci (MS). Eight subjects with low (<10(4)) and 8 with high (>10(6)) numbers of MS per millilitre saliva participated. Three 7-day test periods were conducted. During two of these, the subjects rinsed either 5 or 10 times daily with 10% sucrose; the third period without any mouth rinses served as control. The subjects refrained from oral hygiene during the last 3 days of each test period. On day 7, the following parameters were measured: plaque pH after a sucrose rinse, numbers of MS, Streptococcus sanguis and lactobacilli in saliva, percent MS in plaque and plaque index. The results revealed that plaque acidogenicity was more pronounced for the high-MS group compared to the low-MS group after all three test periods, i.e. lower resting pH, deeper pH falls and a lower final pH. For both groups, the greatest pH-lowering capacity of plaque was found after the period with 10 sucrose rinses/day. An increase in bacterial counts was noted for both groups during the test periods with the 5- and 10-time rinse regimen; this increase was larger for the high-MS group compared to the group with low MS counts. The highest plaque index was, irrespective of the test period, found for the high-MS group.
Aranibar Quiroz
E M
EM
Department of Cariology, Faculty of Odontology, Sahlgrenska Academy at Göteborg University, Göteborg, Sweden. miguel.aranibar@odontologi.gu.se
Lingström
P
P
Birkhed
D
D
D000328:Adult; D000704:Analysis of Variance; D015169:Colony Count, Microbial; D018592:Cross-Over Studies; D003773:Dental Plaque / Q000737:chemistry* / Q000209:etiology / Q000382:microbiology*; D003774:Dental Plaque Index; D019422:Dietary Sucrose / Q000009:adverse effects*; D005260:Female; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007778:Lactobacillus / Q000302:isolation & purification; D008297:Male; D012463:Saliva / Q000382:microbiology; D016037:Single-Blind Method; D013298:Streptococcus sanguis / Q000302:isolation & purification
D019422:Dietary Sucrose