Which pontic design is preferred for a mandibular posterior fixed partial denture?

Correct answer: A. Sanitary (hygienic) pontic

• A. CORRECT. In the non-aesthetic mandibular posterior region the priority is CLEANSABILITY. The sanitary pontic stands clear of the ridge with at least 2 mm of clearance, so the patient can pass floss or a proxy brush right under it. No tissue contact means no tissue inflammation.
• B. The modified ridge lap contacts only the buccal aspect and is the workhorse for maxillary posterior and other visible sites where some aesthetics is needed.
• C. The full ridge lap covers the ridge broadly on both buccal and lingual aspects, creating a concave surface that traps plaque and is essentially impossible to clean. It is obsolete.
• D. The ovate pontic sits in a surgically or provisionally developed socket-shaped depression. It gives the best emergence profile and is reserved for the ANTERIOR aesthetic zone.

Note: Choose by weighing aesthetics against hygiene. Mandibular posterior sees neither lip nor cheek display, so hygiene wins outright. Anterior and maxillary posterior sites need the modified ridge lap or ovate design and accept the added cleaning burden.