A dental instrument, suitable for use when creating a dental filling, is provided. The dental instrument includes a wedge and a matrix. The matrix is fixedly attached to the wedge, and the wedge is adapted to be inserted into the approximal space between two teeth of a patient. The wedge has a bow shape along a length axis of the wedge, the matrix has a first bow shape along a length axis of the matrix, and the matrix also has a second bow shape along an axis perpendicular to the length axis of the matrix. A method of using the dental instrument and a disposable system, which further comprises a protective member, is further provided.