Hygiene, dental and general . e teeth are setand held by their membrane. It envelops the roots of theteeth and develops in such a way as to rise to a considerableheight between the teeth, forming a crest known as the alve-olar crest. The peridental membrane is the term applied to the softtissues lying between the root of the tooth and the walls of thealveolar socket, its function being to attach the teeth to thebone of the jaw. Various groups of fibers radiate from theperidental membrane to the gingiva? and the alveolar processin which they are attached. These fibers not only attach thetooth t
Hygiene, dental and general . e teeth are setand held by their membrane. It envelops the roots of theteeth and develops in such a way as to rise to a considerableheight between the teeth, forming a crest known as the alve-olar crest. The peridental membrane is the term applied to the softtissues lying between the root of the tooth and the walls of thealveolar socket, its function being to attach the teeth to thebone of the jaw. Various groups of fibers radiate from theperidental membrane to the gingiva? and the alveolar processin which they are attached. These fibers not only attach thetooth to the alveolar bone but they pass from tooth to toothover the alveolar crest forming a continuous chain connectingthe teeth from one extremity of the arch to the other. These DENTAL HYGIENE 29 fibers have the effect of a ligament binding the roots of theteeth to the bone. It will be seen that the extraction of anytooth literally breaks the continuity of the entire gingiva, resting on the crest of the alveolar process. Fig. 8.—Diagram illustrating groups of fibers of the gingivae and peridentalmembrane. Bucco-lingual section through a bicuspid tooth and investing , Free gingiva; group of fillers; Ac, Alveolar crest group of fibers; H, Horizontalgroup of libers; (), Oblique group of fibers; A, Apical group of fibers; B, Boneor alveolar process. (Blacks Special Dental Pathology.) 30 HYGIENE: DENTAL AND GENERAL encircles each tooth and rises on the septal crest to a pointbelow and near the contact of the proximal surface of the ad-joining teeth. This tissue hugs closely the neck of the toothbut is not attached to it, the space between the tooth and thetissue being known as the sub-gingival space. Any injury tothis free gingival tissue affects seriously its protective func-tion and exposes a vulnerable portion of the tooth to the acid-forming bacteria, while the crowding down of the septal gin-giva affords a favorable place for the impaction of foodmaterial. This
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecthygiene, bookyear1920
