. The Dental cosmos. e related structuresare harmoniously developed will there beproper correlation of structure and func-tion, but let there be a marked deviation from normal development in one of theseregions, and it will be found to havecaused a similar lack of development inthe correlated structure of either the max-illary and dental arches or in the nasalstructures. Thus it is that an undevel- Crystalline lens. Unciform meatus. Inferior turbinate. Vestibule of the molar. Distal root of first molar. Inferior dental
. The Dental cosmos. e related structuresare harmoniously developed will there beproper correlation of structure and func-tion, but let there be a marked deviation from normal development in one of theseregions, and it will be found to havecaused a similar lack of development inthe correlated structure of either the max-illary and dental arches or in the nasalstructures. Thus it is that an undevel- Crystalline lens. Unciform meatus. Inferior turbinate. Vestibule of the molar. Distal root of first molar. Inferior dental nerve. —Gryer. oped dental arch means an undevelopednasal cavity, and vice versa, and aninterference in one region with normalocclusion and in the other with normalrespiration. These are established facts which caneasily be verified by the examination ofanatomical specimens varying from thenormal conditions shown in Fig. 1 tosuch an extent that this interrelation- Fig. 1. Middle Hiatus ethmoidalsemilunaris. 512 THE DENTAL COSMOS. ship of structure and function in theseassociated structures is self-evident. For example, in Fig. 2 a considerablevariation in the anatomical region underdiscussion is shown. Observe the narrowand high maxillary arch, and, in thenasal meati above, a serious obstructionto nasal breathing on one side, caused bythe deflection of the nasal septum, alsothe small antral sinuses, indicating lackof full development. Even the orbital TYPAL VARIATIONS AND PREDISPOSITIONS. When we further consider some ofthese anatomical variations of the inter-nal face with reference to the type ofhead in which they occur, a peculiar andimportant relationship of the correlatedinternal structures of the maxillary ar-ches and nasal structures will be example, there are certain types ofindividuals with the dolichocephalic type Fig. 2.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentist, bookyear1912
