1922 Journal of the American Medical Association  
tem and through which other bacteria of the mouth may readily pass. Concerning the cementimi, it makes no difference whether the suppuration occurs at the gingival attach¬ ment or at the apex of the root, in which case, follow¬ ing the death of the pulp, the infection passes through the apical foramen or foramina into the tissues imme¬ diately surrounding the apex. Thus we see that these two chronic infections, namely pyorrhea and chronic alveolar abscess, both propagated by dead cementum, are
more » ... dead cementum, are the results of two factors, the first being a gingivitis, the second, following the death of the tooth pulp. , The first requisite in the conservation of healthy teeth and their investing structures is the avoidance of gingivitis, which is caused by numerous faulty condi¬ tions, among which are (1) salivary calculus and (2) semmai calculus, and which is due to (a) lack of contact of the teeth; (b) improper contact; (c) deviation from the normal, smooth contour of the
doi:10.1001/jama.1922.02640120002002 fatcat:p5ogho2fxbfstbp3ivlgk4biyq