Table 2 Cementation procedure

IPS e.max CAD (groups LiDi/LC and LiDi/DC)

Etch with 9% hydrofluoric acid for 10 s

Etch with 37.5% phosphoric acid for 10 s

Apply a 2 mm diameter drop of NX3 Nexus cement onto the center of dentin surface

Rinse thoroughly with water

Rinse thoroughly with water

Place the ceramic slice on top of the cement

Air dry

Gentle air flush for 10 s

Apply finger pressure until excess cement appears around the tooth margins

Apply silane for 60 s

Apply OptiBond Solo for 15 s

Light cure^a for 2 s

Air dry

Air thin for 3 s

Remove the excess by explorer then light cure^a 20 s on each surface of the assembly

Katana Zirconia (groups Zr/LC and Zr/DC)

Sandblast with 50 μm aluminum oxide powder at 2 bar/30 psi

Light cure^a for 10 s

Ultrasonic clean

Air dry