The Dental cosmos . owerjaw is excessively large ; although all of the teeth of the lower jaw tip 936 THE DENTAL COSMOS. inward, yet the outer cusps of the upper teeth just touch the innercusps of the lower teeth. There is marked arrest of development ofthe upper jaw, and on the right side the arch has a tendency to assumethe saddle-shaped deformity. On this side the cuspid has eruptedexternally to the arch and between the central and the lateral incisors ;its mesial surface is directed inward. The lateral incisor is internalto the other teeth. The lateral incisor on the left side is situated
The Dental cosmos . owerjaw is excessively large ; although all of the teeth of the lower jaw tip 936 THE DENTAL COSMOS. inward, yet the outer cusps of the upper teeth just touch the innercusps of the lower teeth. There is marked arrest of development ofthe upper jaw, and on the right side the arch has a tendency to assumethe saddle-shaped deformity. On this side the cuspid has eruptedexternally to the arch and between the central and the lateral incisors ;its mesial surface is directed inward. The lateral incisor is internalto the other teeth. The lateral incisor on the left side is situated in-ternally to the central incisor and cuspid, and has caused a slightrotation of the central incisor. The second molars are small, andhave erupted externally to the first molar on account of lack of room inthe jaw. The alveolar process and mucous membrane are hyper-trophied. This case clearly shows that at the time of the formation of theirregularities of the teeth the alveolar process and mucous membrane Fig. i began to hypertrophy ; coincident with these was arrest of develop-ment of the bones of the face, nose, and jaw, and the habit of mouth-breathing was formed. Case 10.—Fig. ij. Mr. William S., age thirty-four years ; nation-ality, German. Height of vault, .71 of an inch. Has always breathedthrough the mouth until an operation four years ago. Has had scar-let fever and measles. As will be observed by examining the cut,this jaw is well developed. The central incisors overlap slightly, dueto Riggss disease. The left side has a tendency to assume the saddle-shaped deformity, due to the position of the bicuspids, which wasprobably assumed on account of the too long retention of the tem-porary teeth. The crowns of the molars have decayed and brokenoff. The thickening of the mucous membrane is the result of Riggssdisease. Case 11.—Fig. 18. M. W., age thirteen years ; nationality, Amer- MOUTH-BREATHING, ETC. 937 ican. Height of vault, .62 of an inch. Has breathed throug
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Keywords: ., bookauthor, bookcentury1800, bookdecade1890, booksubjectdentistry
