DANB General Chairside Practice Test

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What is the primary purpose of a dental matrix band?

To create a mold for resin restorations
To provide support and contour for restorative materials
To extract carious tooth structure
To apply fluoride treatments

The correct answer is: To provide support and contour for restorative materials

The primary purpose of a dental matrix band is to provide support and contour for restorative materials. When a dentist performs restorative procedures, especially with composite resins or amalgam materials, the matrix band plays a crucial role in shaping the restoration to fit the natural contours of the tooth. The band is typically placed around the tooth to create a temporary wall that helps contain the restorative material as it is packed into the cavity preparation. This ensures that the restoration has the appropriate form and function, restoring the tooth's anatomy correctly. Using a matrix band also prevents excess material from spilling out of the preparation into adjacent areas, which can be particularly important for proximal surfaces. The ability to achieve proper margins and fit with the surrounding tooth structure is vital for the longevity of the restoration and the overall health of the tooth and gums.