The saddle pontic has a concave fitting surface that overlaps the residual ridge buccolingually, simulating the contours and emergence profile of the missing tooth on both sides of the residual ridge. How ever, saddle or ridge lap designs should be avoided because the concave gingival surface of the pontic is not accessible to cleaning with dental floss, which will lead to plaque accumulation (Fig. 20-12). This design deficiency has been shown to result in tissue inflammation' (Fig. 20-13).
MODIFIED RIDGE LAP PONTIC The modified ridge lap pontic combines the best features of the hygienic and saddle pontic designs, combining esthetics with easy cleaning. Figs. 20-14 and 20-15 demonstrate how the modified ridge lap design overlaps the residual ridge on the facial (to achieve the appearance of a tooth emerging from the gingiva) but remains clear of the ridge on the lingual. To enable optimal plaque control, the gingival surface must have no depression or hollow. Rather, it should be as convex as possible from mesial to distal (the greater the convexity, the easier the oral hygiene). Tissue contact should resemble a letter T (Fig. 20-16) whose vertical arm ends at the crest of the ridge. Facial ridge adaptation is
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