Efeito de um dentifrício fluoretado contendo bicarbonato de sódio na contagem de estreptococos do grupo mutans, acidogenicidade e composi？？o da placa dental

this investigation evaluated the effect of a fluoride baking soda-containing dentifrice on mutans streptococci counting, acidogenicity and composition of dental plaque. twenty-three volunteers brushing their teeth 3 times a day, tested 3 formulations of fluoride (1500 ppm f), containing or sodium bicarbonate (12%) associated with calcium carbonate (carb/bicar), or calcium carbonate (carbonate), or silica (silica), in a double blind crossover trial, done in 3 phases of 30 days each. on the 28th day, 8-10 hours after the last brushing, a counting of mutans streptococci in saliva (sms) was made. on the 30th day (after 48 hours during which the subjects were instructed to rinse with a slurry of toothpaste/water 3 times a day and sucrose 10% 6 times a day), the effect was analyzed in dental plaque, 10-12 hours after the last rinse: a) mutans streptococci (pms); b) polysaccharide alkali-soluble (asp); c) acid-soluble f (asf) and d) ph in t0 (t0), 5 min. after cariogenic challenge (t5), calculating dph (t0 - t5). the results (mean + se) according to the treatments with dentifrices silica, carbonate and carb/bicar, were respectively: 1) sms (x 106 ufc/ml saliva) = 11.43 + 7.62 a; 2,33 + 1.04 a; 2.07 + 1.10 a; 2) pms (x 106 ufc/mg) = 0.099 + 0.095 a; 0.027 + 0.018 a; 0.007 + 0.003 a; 3) asp (mg/mg) = 6.89 + 0.62 ac; 8.46 + 0.80 ab; 6.11 + 0.59 c; 4) asf (mg/g) = 36.67 + 10.10 a; 48.12 + 19.23 a; 52.21 + 15.12 a; 5) t0 = 6.72 + 0.12 a; 6.88 + 0.13 a; 6.65 + 0.11 a; 6) t5 = 5.61 + 0.13 a; 5.71 + 0.13 a; 5.70 + 0.12 a; 7) dph = 1.12 + 0.11 a; 1.17 + 0.11 a; 0.95 + 0.10 a. means followed by the same letter do not differ significantly (p < 0.05). the data show that although the baking soda-containing dentifrice demonstrated, collectively, a trend to influence positively the various factors of dental caries, it did not differ significantly from silica and carbonate dentifrices.