A patient's cast used to good advantage for the demonstration of specific points not so readily visualized by the patient when demonstrated in the mouth. This patient, whose teeth are extraordinarily large, was shown that, in gauging the position of the brush so that the entire occlusal surface of the third molar can be included, he should not permit the last heel tufts to reach mesially beyond the distal cusp of the first molar. When teeth are of average size, however, the heel tufts may reach to, but not beyond, the mesial part of the first molar.
Black & white photograph
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