Accelerated Academy Dental Assisting Midterm Practice Test

Finishing and smoothing margins after placement relies on refining the edge where the restoration meets the tooth to create a smooth, well-adapted margin that resists leakage and plaque buildup. A burnisher is used for this step because its rounded, smooth surface allows you to glide over the restoration, compressing any surface irregularities and shaping the marginal contour without removing material. This creates a sealed, glossy margin and helps reduce porosity, improving the longevity of the restoration. The other tools have different purposes during placement: a spoon excavator removes carious dentin; an amalgam carrier transports the material into the cavity; a dental plugger condenses and adapts the amalgam during placement, but they do not finish or smooth the margins after placement like a burnisher does.