Building the edentulous impression--a layering technique using multiple viscosities of impression material.

The purpose of this article is to introduce a novel impression technique. The procedure demonstrates a building, or layering, method of impression making that maintains the integrity between layers of the impression materials of varying viscosities and controls the path of insertion, minimizing the incidence of overextension. To build a detailed impression of the tissue-bearing surfaces, the clinician selects the proper viscosity of impression material based on the diagnosed tissue condition.

An accelerated in vitro model for adhesive testing.

Purpose: To develop a pilot in vitro accelerated laboratory testing protocol for assessing marginal sealing capability of dental adhesives.

Methods: Occlusal cavities were prepared in 20 human molar teeth and restored with Spectrum TPH resin composite. Prime & Bond NT and Prompt L-Pop served as the adhesive for eight teeth each.

Light-curing technology: past, present, and future.

The availability of light-curable resin systems has led to the development of a variety of technologies for producing the light necessary to cure them. Light, being electromagnetic radiation, is comprised of a wide spectrum of energies including ultraviolet, visible, and infrared. Each wavelength region of light has different characteristics in terms of chemical reactions, most notably polymerization of dental materials.