Which pontic design is LEAST suitable for the esthetic zone because it does not contact the residual ridge?

The hygienic (sanitary) pontic has a convex basal surface that is elevated away from the residual ridge, making no mucosal contact. While this design is easy to clean and has no tissue compression, the absence of ridge contact creates an unfilled space that is visible and esthetically unacceptable in the anterior region. It is best suited for mandibular posterior areas where esthetics are secondary. The ovate pontic (oval convex base that rests in a soft tissue receptacle) is the gold standard for esthetic zones. The modified ridge lap is a compromise that contacts only the buccal aspect of the ridge. The saddle pontic (contacts both buccal and lingual ridge) is poor for hygiene.