Wedges are used in matrix restorations to do what?

• A. Adapt the matrix to the tooth
• B. Cure the resin
• C. Select shade
• D. Etch enamel

Answer: (A)

The main idea here is that wedges are used to adapt the matrix to the tooth during a matrix restoration. Placed interproximally, a wedge snugly seats the matrix band against the tooth surface and into the gingival embrasure. This creates a tight seal at the gingival margin, helps prevent resin from seeping under the band, and shapes a proper proximal contact and contour after curing. The wedge also helps compensate for resin shrinkage by maintaining pressure that keeps the matrix pressed against the tooth as the material sets, reducing the risk of open contacts or overhangs.

The other steps—curing the resin, selecting a shade, and etching enamel—are separate parts of the procedure: curing is done with a curing light, shade is chosen with a shade guide, and enamel etching is performed before bonding.