Which principle of amalgam cavity preparation pertains to making the cavity easier to prepare and place the restoration?

• A. Preservation of tooth structure
• B. Resistance form
• C. Proper cavosurface margins
• D. Convenience form

Answer: (D)

Convenience form is the idea of shaping the cavity so it is easy for you to prepare and place the restoration. In an amalgam prep, this means creating access that lets you see and reach all parts of the cavity, use the condenser effectively, and carve and trim the material to the correct contours without fighting against restricted angles or poor visibility. It’s about practicality—giving yourself room to work, so you can place the restoration properly and finish it cleanly. The other principles address different goals: preserving tooth structure focuses on conserving as much healthy tissue as possible; resistance form ensures the tooth-restoration complex can withstand biting forces without fracturing; proper cavosurface margins aim to seal the restoration and prevent leakage.