. The Dental cosmos. 3) Individuals, such as the Swiss type {ain Fig. 14) may be said to lack nasaland maxillary development in compari- Fig. 26. (Coeberg.) As of lower animals, so is it true ofthe human race, that The teeth con-form to the skull, rather than the skullto the teeth. When we further consider some of theanatomical variations of the face with son with those of the brachycephalic orFrench type. By comparing Figs. ITand 18. two cross sections of skulls, werecognize, by the width oi the skull ascompared with the length in Fig. IT. atypical dolichocephalic type, the skull 6T8 THE DENT
. The Dental cosmos. 3) Individuals, such as the Swiss type {ain Fig. 14) may be said to lack nasaland maxillary development in compari- Fig. 26. (Coeberg.) As of lower animals, so is it true ofthe human race, that The teeth con-form to the skull, rather than the skullto the teeth. When we further consider some of theanatomical variations of the face with son with those of the brachycephalic orFrench type. By comparing Figs. ITand 18. two cross sections of skulls, werecognize, by the width oi the skull ascompared with the length in Fig. IT. atypical dolichocephalic type, the skull 6T8 THE DENTAL COSMOS. appearing to be internally compressed,while in Fisr. IS we note the small, nar-row nasal fossa?, deflected septum, andnarrow vault and arch. It is in thesetypes that we are apt to find a lack ofdevelopment and consequently malocclu-sion. However, the point I wish to em-phasize is the great difference existingin the thickness of the maxilla, whichwe must consider in the study of the nor-mal arches. Fig. i Crver.» CONSIDERATION OF FACIAL AND DENTALCHARACTERISTICS IN ORTHODONTICTREATMENT. By studying the general characteristicsfound in normal arches in conjunctionwith normal skulls we can obtain a com-prehensive idea of their demands. to 22 show the front, side, and theocclusal surfaces of a number of normalocclusions. From these illustrations itis easy to see that, in the case of normalupper and lower arches in normal occlu-sion, both upper and lower arches pre-sent the same relative form as the sixanterior teeth, in a section of a semi-ellipse, while from the distal half ofthe canines to the molars the remainingteeth are in either a direct straight or slightly curved line, this line continuingto the first molar at least. In the decid-uous set of teeth, this anterior curve isgreater than in the permanent set: infact, the ten teeth may be described asfalling within half of a circle. (SeeFig. 13.) Both halves of the arch maybe said to be symmetrical. The di
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Keywords: ., bookcentury1900, bookdecade1910, bookiddent, booksubjectdentistry
