Abstract: A method is provided of utilizing a plurality of transferable coatings of contrasting colors for marking contact points at predetermined areas on the occlusal surface of a dental restorative. A coating of each color is applied to predetermined areas of the occlusal surface of a tooth impression molding. The coated surface is then brought into occluding relation with a dental restorative whereupon a portion of the previously applied coating in each predetermined area is transferred to the corresponding predetermined area of the restorative occlusal surface only at each contact point located within said corresponding predetermined area.

Abstract: A tray assembly is provided for use in mixing at least one ingredient with a liquid to form a product having a predetermined moisture content and then maintaining the said moisture content while the product is disposed within the tray assembly. The tray assembly includes a receptacle having a surface on which the product is mixed and supported thereby. Subtending in spaced relation the receptacle is a reservoir in which is disposed a predetermined amount of liquid. One end of an elongated wick is immersed within the liquid accumulated in the reservoir and the opposite end of the wick is disposed in the receptacle and in contact with the product therein.