Principles and practice of operative dentistry . termed Aerobes, the other Anaerobes. The aerobic bacteria requireFw. 228. the oxygen of the atmosphere in order to maintain existence,and therefore live upon the sur-faces of substances. The yeast fungi are examplesof aerobic bacteria (Fig. 228). Fig. 229 shows one of the forms of yeast fungi—the torula. The anaerobic bacteria do not require oxygen to maintain existence, hence they live be- Various forms of yeast fungi, a, colonies of round „ „ cells (saccharomyces conglomerate?); 6, single Cells of neatll tne SUITaceS 01 liquids different forms
Principles and practice of operative dentistry . termed Aerobes, the other Anaerobes. The aerobic bacteria requireFw. 228. the oxygen of the atmosphere in order to maintain existence,and therefore live upon the sur-faces of substances. The yeast fungi are examplesof aerobic bacteria (Fig. 228). Fig. 229 shows one of the forms of yeast fungi—the torula. The anaerobic bacteria do not require oxygen to maintain existence, hence they live be- Various forms of yeast fungi, a, colonies of round „ „ cells (saccharomyces conglomerate?); 6, single Cells of neatll tne SUITaceS 01 liquids different forms partly forming daughter-cells; c, cylin- an(I within the tissues of living drical cells of the pellicle fungus (saccharomyces myco- . ,. „, -r. . , . derma) bodies. The Bacterium is an example of the anaerobic bacteria; oxygen retards its growth or completely arrests its development. A very large proportion of all the bacteria are aerobic. Some of them are so dependent upon oxygen that even the slightest diminution in the. BACTERIOLOGY OF THE MOUTH. 87 amount is sufficient to retard or completely arrest their are termed obligate aerobic bacteria. Others will develop equallywell in a medium rich in oxygen, or where there is no oxygen, or rather,independent of the atmosphere. These are called facultative aerobic bac-teria. Nearly all the disease-producing forms of bacteria belong to thefacultative variety. The fluids and tissues of the body contain a certainamount of oxygen, but this is soon consumed by the rapid growth andmultiplication of the bacteria; consequently their development would bearrested or their existence terminated did they not i^ossess the faculty ofliving under certain conditions without the presence of oxygen. The capability of certain bacteria to proliferate and to manifest theirspecific action without access of air may explain the progress of tooth cariesunder air-tight fillings in cases where the softened dentin was not tho
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectdentist, bookyear1901
