Identifier: hygienedentalge00turn (find matches)
Title: Hygiene, dental and general
Year: 1920 (1920s)
Authors: Turner, C. E. (Clair Elsmere), 1890-1974 Rice, William
Subjects: Hygiene Teeth
Publisher: St. Louis, C. V. Mosby
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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Fig. 2.—Model illustrating normal occlusion. that normal development of the entire bony structure of thehead is to a certain extent dependent upon the proper develop-ment of the teeth. Function.—Among the causes of malocclusion must be con-sidered the dependence of development upon function. Forinstance, a study of the organs of mastication of the anthro-poid ape (mans prototype) reveals massive structure, de-manded by the functional activity incident to the masticationof the kind of food available for his sustenance and uponwhich his existence depended. 22 HYGIENE: DENTAL AND GENERAL With the development of modern methods for refining theraw materials to be used as food and the acquirement of theepicurean habit—which demands the preparation of complex,highly seasoned food calculated to stimulate pleasurable sen-
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Fig. 3.—Observe the asymmetric development of the bones of the skull of adog due to the interference with the function of the upper left lateral halfof the dental apparatus. sations in those whose appetites are already satiated by over-indulgence—the necessity for vigorous muscular effort hasbeen removed and the stimulating effect of vigorous function-ing has been lost. The lower part of the face has thus been DENTAL HYGIENE 23 reduced in size but the teeth have not relatively changed. Theresult is that the teeth of many people are out of harmony insize with the rest of the features. All variations from the normal in the development of the

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