(a) correct insertion of the tufts interproximally in the occlusal direction through the interdental embrasure, at an angle of about 45 degrees. This precludes puncturing of the septal tissue as the bristles glance over it. Furthermore, as the embrasure is broader near the cervical part, the bristles readily glide through it into the interdental space. (b) as the tufts in (a) enter the interdental space, they are directed horizontally, and the brushhead is held parallel to the buccal surface of the teeth. (c) the position of the brush is rotated, thus permitting of more effective cleansing of a presenting exposed cervical root surface, an area often omitted in a cleansing with dental floss alone [...]. (d) improper approach of the bristle tufts toward the interdental space - the horizontal position tends to traumatization of the septal tissue and the bristles cannot enter the interdental space adeqautely. (e) improper position of the brushhead: the gingiva can be readily traumatized by the hard base of the brush when held at this angle. See Fig. 322. (The contact points in these illustrations are depicted by a small horizontal oval near the bottom of each figure).
Black & white drawing
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