The amount of wear in microns will be determined for the x, y and z axes. Data will be subjected to a one-way ANOVA (α = 0.05 ) to determine any significant difference in wear of natural antagonist teeth and the ceramic crowns between baseline and yearly 3D images and also differences in wear between the yearly 3D images. Occlusal thickness of restorations will be determined based on the amount of wear calculated. Any presence of cracks or fractures will be recorded. Correlation of the amount of wear and any changes in vertical dimension and root cementum length will also be determined by comparison of nasion-chin height at different intervals.