The demand placed on a matrix band for such a matrix primarily is that it should ensure the making of a filling without any deficiency of material, i.e. where the filling does not reach as far as the natural contour of the tooth, but also prevent exaggerated excess of material, which has to be removed at a later stage. The matrix band should also permit light-curing, i.e. it must be translucent. Generally, it therefore consists of plastic.