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.