Recognition of Bacillus Acidophilus Associated with Dental Caries: A Preliminary Report**Work aided by a grant from the American Dental Association.Read before the Section on Histology, Physiology, Bacteriology and Chemistry (Research) at the Seventy-Second Annual Session of the American Dental Association, Denver, Colo., July 23, 1930.

Studies of the Cause and Nature of Dental Caries

“…The selection of a name that will cause the least confusion depends chiefly on the correct answer to the question: Is the oral species of lactobacillus identical with the intestinal species named acidophilus by Moro (64) in 1900? This answer has been sought within the last few years by Morishita (62,63), Rosebury, Linton, and Buchbinder (72), Howitt (47), and Hadley, Bunting and Delves (30). In the earlier paper of Morishita (62), he reported that "the tooth organisms discussed here constitute a type entirely separate from B. acidophilus of the intestinal tract;" in his last paper he reported that "it is impossible to say definitely whether the different organisms described by various workers are entirely distinct species, or whether they are different forms of one or the same species."…”

“…Each tooth, covered in the manner described above, was immersed in 40 cc. of buffer solution, and one tooth was removed from each of the different solutions at the end of the following periods: 1, 2, 3, 4, 5, 7, 9,11,14,21,30,40,50, and 60 days.…”

“…Rosebury (72) and his associates expressed the opinion that the cultural differences between oral and intestinal strains also existed between the intestinal strains as a group, and that there was therefore no justification in separating these organisms into distinct groups. Hadley, Bunting, and Delves (30), believing that the tooth strains are identical with the intestinal strains, maintain that Lactobacillus acidophilus should be the chosen name. Rodriguez (71) and McIntosh (57), by choosing the names L. odontolyticus and L. acidophilus odontolyticus, respectively, early indicated their belief that there were essential differences between the oral and intestinal strains.…”

A Histopathological Study of the Bacterial Plaque in Relation to the Destruction of Enamel, Dentine and Bone with Special Reference to Dental Caries [Condensed]

“…The plaque.-Observations on the bacterial plaque on enamel and exposed cementum were described. It was noted that the plaque flora showed a rather constant type of organism which morphologically is a Gram-positive beaded or coccoid rod or filament according to size, resembling the lactobacillus (Hadley et al, 1930;Morris, 1953). Coccal or streptococcal bacteria were also common.…”

Bacteriological, Chemical, and Nutritional Studies of Dental Caries by the Michigan Research Group

“…B. acidophilus have been made by Faith Hadley, et al(3,4), in which they have found that no consistent differences exist between the oral and intestinal strains. They have shown close correlation of this organism in the mouth to the activity of dental caries, and have determined the frequency of occurrence of various types of B. acidophilus under different degrees of caries susceptibility.A valuable aid in the study of the bacteriology of dental caries was furnished by Faith Hadley(5) in the development of a method for quantitative estimation of B. acidophilus in saliva.…”