General and dental pathology with special reference to etiology and pathologic anatomy; a treatise for students and practitioners . hysiologic process. Itis a pathologic process when it results from the continued frictionbetween the surfaces of opposing teeth in malocclusion, when theresult of undue friction by the toothbrush, or when because of theuse of gritty tooth powders, or masticatories such as chewinggum or tobacco, or of holding pipe or cigarette stems between the 356 ABRASION and erosion 357 teeth. The loss of the posterior teeth, throwing the bulk of theforce of mastication upon the
General and dental pathology with special reference to etiology and pathologic anatomy; a treatise for students and practitioners . hysiologic process. Itis a pathologic process when it results from the continued frictionbetween the surfaces of opposing teeth in malocclusion, when theresult of undue friction by the toothbrush, or when because of theuse of gritty tooth powders, or masticatories such as chewinggum or tobacco, or of holding pipe or cigarette stems between the 356 ABRASION and erosion 357 teeth. The loss of the posterior teeth, throwing the bulk of theforce of mastication upon the anterior teeth, will in time bringabout marked abrasion or wearing away of the occlusal surfacesof the anterior teeth. Pathologic Anatomy of Abrasion The shape of the abraded surfaces will depend upon the posi-tion of the tooth in the arch and the direction and extent of thefrictional forces. It may be nothing more than a decrease in thevertical diameter of an incisor with the formation of a squarearea as the result (Figs. 273, 274, and 275); or it may have pro-gressed to the extent of a complete wearing away of the crown of. Fig. 272.—Abrasion—mechanical wearing away of the cusps of a lower molar. the tooth and a portion of the root (Figs. 276-279). Mechanicalappliances, such as lingual bars, clasps, etc., are frequently thecause of abrasion. Such instances are seen in Figs. 280 and which resulted from abnormal stress of occlusion areseen in tin- scries from Fig. 282-289. Any tooth may suffer fromabrasion of such severity as to result in the disappearance of allof its crown and even a portion of its root, The abraded surfacepresents a highly polished appearance, and, regardless of the ex-tent of tooth structure lost, the pulp does not become exposed,since a constructive and protective process takes place simul- 358 DENTAL TATIIOLOOY taneously with the loss of tooth structure. Tubular calcificationand secondary dentin are going on constantly in teeth which ar
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpathology, bookyear19
