Which item functions as a matrix in direct restorations and is clear?

• A. Crown remover
• B. PFTE tape
• C. Clear matrix
• D. Black

Answer: (C)

In direct restorations, the matrix provides a temporary wall to shape and contain the composite material at the proximal surfaces. A clear matrix is ideal because its translucency lets you see the margins and the contact area while you place and cure the resin. Light can pass through, so the composite cures properly beneath the matrix, and you can monitor contour and adaptation to ensure a smooth proximal surface and a correct contact with the adjacent tooth. Other items listed serve different roles—crown remover is a tool for removing crowns, and PTFE tape is used for isolation or barrier purposes—not as a shaping matrix. Thus, the clear matrix best fits the function of a matrix in direct restorations and is clear.