A. Composite is the material that the engineer should choose if he wants the filling design to be durable and attach to the natural tooth. Composite is a tooth-colored material made of plastic and glass that is used to fill cavities and repair other dental damage. It is a durable and strong material that can bond well with the natural tooth, providing a natural appearance and long-lasting results. Silver, gold, and porcelain are also commonly used dental filling materials, but they may not bond as well to the natural tooth or offer the same level of durability and strength as composite.