A pontic replacing a mandibular first molar should be designed so that 1. it seals the muco-gingival field. 2. it has opened gingival embrasures. 3. it conceals the porcelain to metal junction on its gingival surface. 4. its gingival surface is convex in all directions.
(2) and (4)
(1) (2) (3)
(1) and (3)
(4) only
All of the above.
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