Which term describes a design feature that primarily improves access to the inner aspects of a cavity?

• A. Outline form
• B. Resistance form
• C. Convenience form
• D. Retention form

Answer: (C)

Access inside a cavity is improved by shaping the preparation to give the clinician a clear view and a straight, unobstructed path for instruments and materials. This design focus is what convenience form addresses: it creates better access and visibility to the inner walls, margins, and floor so that decay can be removed thoroughly and the restoration can be placed more easily. It’s different from outline form, which mainly sets the overall size and shape of the cavity; resistance form, which aims to keep the tooth from fracturing under function; and retention form, which helps keep the restoration in place. Since the feature described is all about making the interior more accessible, convenience form is the best match.