Which pontic design in a fixed partial denture (bridge) is the most difficult for patients to clean due to its extensive contact with the residual ridge?

The ridge lap pontic has contact with both the buccal AND lingual surfaces of the residual ridge, wrapping around the ridge like a saddle. This extensive contact makes plaque removal extremely difficult for patients, as neither a toothbrush nor floss can adequately clean the tissue-contacting surfaces. Chronic plaque accumulation under a ridge lap pontic causes inflammation, tissue irritation, and potentially caries on adjacent teeth. The modified ridge lap (modified saddle) improves hygiene by removing lingual contact while maintaining buccal esthetics. The sanitary (hygienic) pontic has a convex undersurface with no ridge contact, allowing the easiest cleaning. The ovate pontic sits in a prepared tissue receptor site with a convex tip for esthetics and hygiene.