A dental device for assisting in the filling and curing of a dental restoration when used with a light guide. The dental device includes an insert member and either a conical adapter or handling means adapted to accommodate a light guide. The insert member is tapered at one end thereof has an indicator means to monitor the depth of the restoration to the pulpal floor and to provide alignment of the preparation relative to the marginal ridge of the adjacent tooth. The conical adapter has an opening at the base to accommodate the light guide and an opening at the apex to accommodate the insert member. The handling means funtions in combination with the insert member to form an instrument into which a dental light guide can be mounted and has an elongated body of triangular shape with a first and second opening at the opposite ends of the elongated body adapted to receive insert member(s) which are interchangeable for facilitating mesial and distal contact with an adjacent tooth.