Principals Of Amalgam Cavity Preparation Practice Test

What is the purpose of matrix band placement before condensation?

To decorate the tooth. To widen the cavity. To recreate proximal contour, contact, and prevent material from being extruded. To reduce curing time.

Correct Answer:

To recreate proximal contour, contact, and prevent material from being extruded.

Explanation:

Placing the matrix band before condensation provides a temporary wall that defines the proximal boundary of the restoration. This allows the material to be condensed against a shape that reproduces the natural proximal contour, creating a proper contact with the adjacent tooth. It also confines the material so it doesn’t flow into the gingival sulcus or beyond the restoration margins, preventing extrusion and overhangs. Decorations, widening the cavity, or shortening curing time aren’t achieved by band placement—the band’s role is specifically to shape and support the proximal surface and contact during placement.

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