A substance that sets in a relatively short time for use in general dentistry and in endodontics to replace natural tooth material, the substance comprising untreated mineral trioxide aggregate and milled mineral trioxide aggregate, or comprising untreated mineral trioxide aggregate, milled mineral trioxide aggregate and water. The circuit de-couples the high voltage starting pulse from the input lines so that the starter can function properly regardless of the distance between the ballast and the lamp. This recovery should take place beginning approximately 5 days after infection of the cells in order to permit sufficient quantities of recombinant protein to be expressed and secreted from the cell into the growth media. The deformable fairing changes from a deformed shape to an original shape when the leading edge device is moved to the deployed position. The object of the invention is achieved by providing a semiconductor device comprising a sapphire substrate whose c-surface is modified to be nitride-surfaced, GaN buffer layer, N polarity GaN layer, N polarity AlN layer, N polarity InNInGaN multi-layered device structure, Al polarity AlN layer, and GaN cap layer.