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CP - contact point; IC, area cervically adjacent to the contact point, the most common site of incipient proximal caries, according to G.V. Black. The contact point and this area may be more successfully kept cleansed by dental floss than by the toothbrush bristles; NSG, normal outline of septal gingiva which usually protects any presenting proximal surface concavities on the cervical part from the establishment of hypersensitiveness or caries. As long as this tissues retains its normal contour, no specific interproximal brushing for this purpose is required; ACJ, amello-cemental junction: As the gingiva recedes toward this zone, there is a tendency for the proximal surface thus exposed to assume a concave form (PAC) which usually continues and becomes deeper as it reaches the root surface -such a concavity cannot be effectively cleansed by dental floss but can be reached by the bristle ends. (See Figs. 323 and 324); RSG, receded septal gingiva assuming a concave outline bounded by a buccal gingival crest (BGC) and a palatal one (LGC) - both of which prevent dental floss from reaching the exposed tooth surface apically; accordingly, the use of bristles is indicated. Such concave type of septal destruction usually results from Vincent's infection or food impaction [...].


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