The Dental cosmos . d by caries—some so far de-cayed, because of their broad surfaces ofcontact, as to be almost beyond the hopeof permanent retention. (Fig. 3, a, b.)This is true even in those months where KEMPLE.—ORTHODONTIA AS A PEOPHYLACTIC HEA8UBB. 311 the other teeth are comparatively freefrom decay. Concerning the etiology of pyorrhea,there have been theories countless al-most as the sparkling orbs of heaven. Ithas been the subject for heated debatesince first the attention of the professionwas directed to it by Dr. Riggs, and itmay continue to furnish food for con-troversy till science
The Dental cosmos . d by caries—some so far de-cayed, because of their broad surfaces ofcontact, as to be almost beyond the hopeof permanent retention. (Fig. 3, a, b.)This is true even in those months where KEMPLE.—ORTHODONTIA AS A PEOPHYLACTIC HEA8UBB. 311 the other teeth are comparatively freefrom decay. Concerning the etiology of pyorrhea,there have been theories countless al-most as the sparkling orbs of heaven. Ithas been the subject for heated debatesince first the attention of the professionwas directed to it by Dr. Riggs, and itmay continue to furnish food for con-troversy till science shall have eliminated there must still be some predispositionon the part of the membrane whichmakes it specially liable to such deposi-tion. This predisposition is to be foundin impaired nutrition and lowered vital-ity in consequence of mechanical strainfrom overcrowding of the dental arch. Professor Armand Depres attributesconsiderable importance to the over-crowded condition of the dental arch a> a Fig.
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