Table 1 Materials used in this study.

From: The influence of core-build up materials on biaxial flexural strength of strength-gradient zirconia and lithium disilicate ceramics: an in-vitro study

Brand

Material

Chemical composition

  

Manufacturer

IPS e.max ZirCAD Prime

Medium and high translucent zirconia (3Y-TZP and 5Y-TZP)

88.0–95.5% Zirconium oxide (ZrO2), > 4.5% – ≤ 7.0% Yttrium oxide (Y2O3), ≤ 5.0% Hafnium oxide (HfO2), ≤ 1.0% Aluminium oxide (Al2O3), ≤ 1.5% Other oxides

  

Ivoclar Vivadent AG (Schaan, Liechtenstein)

IPS e.max CAD

 

SiO2 57–80%

Li2O 11–19%

K2O 0–13%

Other oxides 0–8%

  

Ivoclar Vivadent AG (Schaan, Liechtenstein)

Tetric N-Ceram

Nano-hybrid

resin composite

Urethane dimethacrylate, ethoxylated Bis-EMA, Bis-GMA (18.8 wt%), barium glass filler, ytterbium trifluoride, mixed oxide (63.5 wt%), polymer (17 wt%), additives, catalysts, stabilizers, and pigments (0.7 wt%)

  

(Ivoclar Vivadent, Schaan, Liechtenstein)

MultiCore Flow

Self-cured core build-up composite with light-cured option

(Wt%)

-Bis-GMA, urethane dimethacrylate, triethyleneglycol dimethacrylate highly dispersed silicon dioxide.

-Barium glass fillers, Ba-Al-fluorosilicate glass, highly dispersed silicone dioxide

-Ytterbium trifluoride

-Catalysts, stabilizers, pigments

Base

28.1

54.9

16.4

0.6

Catalyst

28.4

54.4

16.2

1.0

(Ivoclar Vivadent, Schaan, Liechtenstein)

Multilink Automix resin cement

two paste, self- curing adhesive resin cement

DMA and HEMA, adhesive monomer, barium glass filler, SiO2 filler, Ytterbium triflorite, accelarator and stabilisator and pigments

  

(Ivoclar Vivadent, Schaan, Liechtenstein)

Monobond N

Universal Primer

Contains 3 different functional methacrylates: Silane methacrylate, phosphoric methacrylate and sulfide methacrylate.

  

(Ivoclar Vivadent, Schaan, Liechtenstein)