A dental preparation delivery system includes a soft malleable wax sealing strip bonded to a wax base strip. This surface contacting member has a fluoroelastomer surface layer containing amorphous silica that has been surface treated with at least one organoaminosilane. The heat shield itself is surrounded by a coiled tubing having a medium that will heat because of the influence of the heat from the light bulb. If the power supply is exchanged to a new battery or the AC adapter is inserted by the operator during this period of time, the printing operation is resumed. A contacting surface of the second metal layer has a top line lower than the upper edge of the inclined wall. The resin composition is formulated to neutral pH in order to reduce the extent of self-polymerisation and provide a satisfactory shelf life.