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Fig. 50. The wedge-shaped areas of erosion, of the " keilformige defecte '" of German
authors. An excellent example of that form of erosion in which a wedge-shaped piece is
removed. In this case the thin edge of the wedge is toward the gingival margin. Only the
lower teeth are eroded. Patient, a woman about forty years of age.
Fie. 51. A modification of the wedge-shaped areas of erosion in which the bottom of the cut
is well rounded instead of a sharp angle. This form is frequent in the bicuspids and first
molars. Patient, a man thirty-five years of age. No other erosion had occurred in the mouth.
