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Neis CA, Albuquerque NL et al. Braz Dent J 2015; 26: 152–155

The investigators found that 1) hydrofluoric acid (10%) should be used to surface condition damaged lithium disilicate ceramic (IPS e.max Press, Ivoclar Vivadent), whereas 2) use of a diamond bur (30 μm grit) is sufficient for leucite-reinforced glass ceramic (IPS Empress, Ivoclar Vivadent). An alternative method for treating leucite-reinforced ceramic would be the use of tribochemical process. The use of hydrofluoric acid lowered the bond strength between resin composite and leucite-reinforced glass ceramic. And, for feldspathic porcelain (VITA VM 7, VITA Zahnfabrik), none of the treatments increased the microtensile bond strengths compared with the control (no surface treatment). These investigators used 12 blocks of each type of ceramic, which were abraded and treated using the different surface conditioning regimens. A silane coupling agent was used before the placement of the resin composite. Each sample was thermocycled. Microtensile bond strength were measured and the failure pattern assessed using a stereomicroscope. Adhesive failure was the predominant pattern of failure.