Jordan University of Science and Technology

Influence of dentine thickness and repeated firing on the colour of IPS e. max press.

ZN Al-Dwairi, KQ Al-Hamad, MI Khasawneh, E Lynch

The purpose of this study was to determine the possible effects of the veneering porcelain thickness, and of repeated firing on the final shade of IPS e.max Press. Sixty disc-shaped IPS e.max Press specimens were fabricated and divided into 6groups according to shade (A2, C2) and porcelain thickness (0.5, 1.0 and 1.5 mm). Repeated firing (3, 5 and 7firings) was performed and the colour differences (AE) were determined. With increased thickness, A2 specimens showed a significant reduction in L* values and increase in a* and b* values while C2 specimens showed reductions in L*a*b values (P < 0.01). We would conclude that clinically, the preparation should provide at least 1 mm of thickness for the aesthetic potential of this dentine porcelain to be realized.