[Plaque flora and dental caries. I. Occurrence of Streptococcus sanguis types in caries-free and caries susceptible school children]. / Plaqueflora und Zahnkaries 4. Mitteilung: Vorkommen von Sc.-sanguis-Typen bei kariesfreien und kariesanfälligen Schulkindern.

The reported results suggest that changes in dental plaque flora and its importance for cariesinitiation in man can only be learned about by 1) investigation into different pre- and early caries phases, 2) by still more differentiation of potentially cariogenic microorganisms, according to their biochemical behavior, and 3) by considering other factors influencing the dental plaque flora like toothbrushing habits. The data presented suggest that Strep. sanguis type I and IIW might cause cariesinitiation with daily toothbrushing individuals.

[Comparative studies of dental plawue in students with and without dental caries. I. Enzymatic determination of the capacity to synthesize lactic acid in an aerobic medium]. / Vergleichende Untersuchungen der Zahnplaque karies- anfälliger und kariesfreier Schüler. I. Enzymatische Bestimmungen der Milchsäurebildungsvermögens im aeroben Milieu

In cultures of dental plaque taken from healthy dental surfaces of children susceptible to caries and children free from caries, the lactic acid content was determined. The cultures had an initial germ count of between 10(3) and 10(4) organisms per ml. After the cultures had been kept in artifical saliva for 7 hours under aerobic conditions, the samples of caries-susceptible children showed a considerably higher acid content than those of caries-free children. In comparative tests carried out in plaque samples simultaneously taken from the same dentitions, the micro-organisms of the samples taken from carious dental surfaces produced more lactic acid under the above mentioned conditions than those of the plaque samples taken from healthy dental surfaces.