DIMENSIONAL CHANGES DURING VENEERING PROCEDURES ON DISCOLORED TEETH

Objectives: The aim of the study was to determine the dimensional chan ges of teeth when veneering procedures are involved. Methods: Fifteen discoloured central incisors were selected from a group of 180 veneer restorations (VRs) composed of three different types of materials (dir ect resin composite, indirect resin composite and porcelain). Impressi ons and dies were made before treatment, after preparation and after p lacement and finishing the restoration. Contact stylus profilometry an d subsequent analysis of the 3-D surface images provided quantitative data of the differences between the various treatment phases. Results: The preparation reduction was the most for indirect resin composite V Rs and the least for direct resin composite VRs. All veneer restoratio ns showed nearly the same thickness and dimensional change after treat ment, except one, which resulted in an additional increase of volume o f the tooth. Conclusion: From the results of this study it is conclude d that the dimensions of a discoloured tooth treated with a veneer res toration unintentionally increased, resulting in overcontour. (C) 1998 Elsevier Science Ltd. All rights reserved.