Masking the Discolored Enamel Surface with Opaquers before Direct Composite Veneering

Abstract

Conservative and aesthetic treatment of a single discolored tooth in the anterior zone is a restorative challenge. Intra-pulpal hemorrhage, dental trauma and endodontic treatment are common reasons for tooth discoloration. If a bleaching procedure cannot be implemented or has been tried without pleasing results, other conservative treatment plans should be considered under the scope of minimal intervention. A relevant application would be the construction of a direct composite veneer. The problem is that composite resins have inherent limitations in their opacification ability, especially when increments are very thin. Thus, in order to match the chromaticity of the adjacent teeth, the use of opaquers is suggested. Opaquers are highly pigmented resinous materials, containing metal oxides that are responsible for their potent opacification ability, characteristic tint and saturation. These materials can effectively mask a dark enamel surface, after minimal tooth preparation. Different composite layers can be stratified on the masked substrate according to the layering technique, emulating the natural dentine and enamel tissues. The aim of this study is to describe the use of opaquers in masking discolored enamel surfaces, prior to direct veneering with resin composites.