title: Influence of dentine thickness and repeated firing on the colour of IPS e.max press.
abstract: 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.
authors.affiliation: Department of Prosthodontics, Faculty of Dentistry, Jordan University of Science and Technology. ziadd@just.edu.jo
authors.forename: Z N
authors.initials: ZN
authors.lastname: Al-Dwairi
authors.forename: K Q
authors.initials: KQ
authors.lastname: Al-Hamad
authors.forename: M I
authors.initials: MI
authors.lastname: Khasawneh
authors.forename: E
authors.initials: E
authors.lastname: Lynch
mesh_terms: D003116:Color; D003776:Dental Porcelain / Q000737:chemistry*; D003801:Dental Veneers; D006358:Hot Temperature; D006801:Humans; D008422:Materials Testing; D013499:Surface Properties
chemical_list: C508050:IPS e.max Press; D003776:Dental Porcelain