Abstract: A dental matrix, for use in filling interproximal tooth surfaces. The matrix, in its main body, or base, is constructed of known matrix materials, such as metal, or stiff translucent or transparent polyester material such as Mylar®. One or more open areas in the main body of the matrix are provided, with those open areas covered by a film material, which may expand, without elastic memory, to provide separation of the exterior portion of the filling from the interproximal surface of an adjacent tooth. The film may be a fluorocarbon material. The utilization of a transparent or translucent base matrix material allows light curing of the filling material. The matrix main body or base may be in any standard shape, for utilization, singly, as held in place by a wedge, in conjunction with a Tofflemire retainer, or other retaining device.