What is the primary role of the matrix band in dental procedures?

The primary role of the matrix band in dental procedures is to secure the dental materials in place while a restoration is being completed. In restorative dentistry, particularly when dealing with posterior teeth, a matrix band is used to form a temporary wall around the tooth that has been prepared for filling. This allows for proper shaping and adaptation of the restorative material, ensuring that it can create a uniform and proper contact with adjacent teeth as well as a smooth, natural form that can withstand occlusal forces.

The band is especially important in class II restorations where the interproximal surfaces need to be correctly contoured, and it aids in preventing the material from flowing out of the cavity preparation while also providing a surface against which the dental material can be formed.