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Dental Caries Induced by Streptococcus milleri

Streptococcus mslleri was originally isolated from dental abscesses (GUTHOF, Zenblt Bakt Abt I Originale 166:553, 1956), although its significance as a member of the normal flora of plaque in children was demonstrated only recently (BOWDEN and HARDIE, Helv Odont Acta 17:45, 1973). A number of species of Streptococcus have been shown to induce caries in germ-free rats (FITZGERALD and KEYES, JADA 61:9, 1960; GIBBONS, BERMAN, KNOETTER and KAPSIMALIS, Arch Oral Biol 11: 549, 1966) and their relative cariogenicities have been examined (GREEN, DRUCKER and BLACKMORE, Arch Oral Biol 19: 1049, 1974), but no information is available on the cariogenicity, or lack of cariogenicity, of S milleri.* In this experiment, the cariogenicity of S milleri CR245 of oral origin, was determined in the gnotobiotic test system used by GREEN, DRUCKER and BLACKMORE (1974) . This system is capable of reproducibly dividing streptococci into groups of high, medium, and low cariogenicity. The results presented in the table show that S milleri CR245 produces both fissures and ap-