Matrix bands are one of the most common tools used in dental offices. They are used with matrix systems for restorative dentistry. A matrix band is made of thin metal that is attached to a retainer holder. The bands are flexible which allows a single band to be bent to fit in any of the four arches. Once a tooth has been prepped for a filling, the matrix band is placed around the tooth. When a tooth has a missing wall, a matrix band will hold the filling material in place allowing the wall to be rebuilt. Small sectional dental matrices are also widely used. A sectional matrix band is designed to aid in establishing a tight interproximal contact. There are several matrix band types. Traditional matrix bands and sectional matrix bands can be used on amalgam and composite restorations.