. The science and practice of dental surgery. ced bacteria produce digestive enzymes,others fermentation, with an acid reaction ; noliquefaction of undecalcified dentine probablytakes place by means of the proteolytic en-zymes : and finally it is practically impossibleto differentiate between pathogenic and non-pathogenic forms. Emery, in WTiting of generalimmunity, says ; It is a most marvellousnatural phenomenon that the putrefactivebacteria should be found wherever life occurs,and wherever their aid may be required todeal with the protoplasm when dead, and thatthis same protoplasm should ha
. The science and practice of dental surgery. ced bacteria produce digestive enzymes,others fermentation, with an acid reaction ; noliquefaction of undecalcified dentine probablytakes place by means of the proteolytic en-zymes : and finally it is practically impossibleto differentiate between pathogenic and non-pathogenic forms. Emery, in WTiting of generalimmunity, says ; It is a most marvellousnatural phenomenon that the putrefactivebacteria should be found wherever life occurs,and wherever their aid may be required todeal with the protoplasm when dead, and thatthis same protoplasm should have acquiredsuch potency in resistmg their attacks whilststill alive. Absence of bacteria, or absence ofimmunity, are alike incompatible with animallife. Considerations of this nature lead us , he( imtinues, to a short discussion between the|iathogenic and non-pathogenic bacteria, andwe. find that there is, theoretically, none. Anyliacterium will produce disease if it grows inthe tissues of the living body, and all bacteria ?:i^^:j>?^ mm. Fig. 394.—Transverse section of carious , Micro-organisnas in tubes, x 180. —those growing only at very high or very low-temperatures, or on media very poor m nitrogen,perhaps excepted—will do so if the necessary 301 degree and form of immunity is not pathogenic organism is one which can growin the living tissues, and it can do so onlybecause those mechanisms of immunitywhich are sufficient in the case of thesaprophytic bacteria are powerless to resistit; but ill most cases, a liigher degree ofimmunity can be produced artificially, andthe microbe in question then becomes non-pathogenic to that particular animal. So,too, will the bacteria ordinarily regardedas non-pathogenic. Under certain circum-stances, some of whicli are known and somestill unknown, the resistance of the body orof a part of it may be broken down to suchan extent that these organisms may gainaccess, flourish, and give rise to , the Bacil
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentistry, bookyear19
