A handle is provided for a medical instrument having a tubular shaft. The dental polymerizable composition comprises three different types of acrylate polymer particles, each having specific particle size characteristics and specific molecular weight characteristics. The second interface may comprise a plurality of antenna contacts located along tracks of the electronic device used to aid reception of the radio card. The second controller charges and discharges a second node and a third node. Modulation of such receptors is useful in treatment andor prevention of a number of conditions including but not limited to treatment of attention disorders, assistance in giving up smoking and in treatment of Parkinson’s disease.