Quick answer
Adhesive bonding attaches a restoration to the tooth chemically and micromechanically using resin cement. It decides whether veneers stay on, and it makes glass-ceramic crowns considerably more resistant to fracture. Each ceramic needs a different bonding protocol.
Why bonding matters more for veneers than crowns
A crown surrounds the tooth, and its walls grip the preparation through geometry. That is mechanical retention, and conventional cements work well with it. A veneer sits on the front surface of the tooth with almost no retention form, so the bond is the only thing holding it on.
The tooth side: enamel versus dentine
Enamel etched with 37% phosphoric acid forms a micro-rough surface that resin bonds to strongly and durably. Dentine is wetter and more organic, and bonds to it are less predictable over time. Veneers bonded mostly to enamel, with margins in enamel, have the lowest failure rates.4
Glass-ceramics: feldspathic porcelain and lithium disilicate
These materials contain a glass phase that hydrofluoric acid dissolves selectively, creating micro-retentive pits.
- Feldspathic porcelain is typically etched with 9–10% hydrofluoric acid for around 60–90 seconds.
- Lithium disilicate (e.g. IPS e.max) is etched with 5% hydrofluoric acid for around 20 seconds. It should not be sandblasted.
A silane primer then bonds chemically to the silica in the ceramic and to the resin cement.1
Zirconia: a different chemistry
Zirconia is a polycrystalline oxide with no glass phase. Hydrofluoric acid does not etch it, and silane barely bonds to it. The reliable protocol is:
- Air abrasion with 30–50 µm alumina at low pressure.
- A 10-MDP primer, whose phosphate group bonds chemically to zirconium oxide.2,3
- An MDP-containing resin cement.
Saliva and phosphoric acid leave phosphate contamination on zirconia that blocks the MDP bond, so a dedicated cleaning paste is used after try-in. See our guide to zirconia grades for how the different zirconias compare.
Choosing the cement
Thin, translucent veneers are usually seated with a light-cure resin cement, which is colour-stable and gives unlimited working time. Thicker or more opaque restorations that transmit less light need a dual-cure cement.
Bonding after teeth whitening
Peroxide leaves residual oxygen in enamel that inhibits resin polymerisation. Bonding should be delayed for at least 7 days, and ideally around 2 weeks, after whitening.5
Summary
| Material | Surface treatment | Primer | Cement |
|---|---|---|---|
| Feldspathic porcelain | 9–10% hydrofluoric acid | Silane | Light-cure resin |
| Lithium disilicate | 5% hydrofluoric acid | Silane | Light- or dual-cure resin |
| Zirconia | Low-pressure air abrasion | 10-MDP | MDP-containing resin |
Related guides
E-max crowns · Porcelain veneers · Zirconium veneers · Teeth whitening
References
- Blatz MB, Sadan A, Kern M. Resin-ceramic bonding: a review of the literature. J Prosthet Dent. 2003;89(3):268–274. PubMed
- Kern M, Wegner SM. Bonding to zirconia ceramic: adhesion methods and their durability. Dent Mater. 1998;14(1):64–71. PubMed
- Özcan M, Bernasconi M. Adhesion to zirconia used for dental restorations: a systematic review and meta-analysis. J Adhes Dent. 2015;17(1):7–26. doi:10.3290/j.jad.a33525
- Gurel G, Sesma N, Calamita MA, Coachman C, Morimoto S. Influence of enamel preservation on failure rates of porcelain laminate veneers. Int J Periodontics Restorative Dent. 2013;33(1):31–39. doi:10.11607/prd.1488
- Savian TM, et al. Vital bleaching influences the bond strength of adhesive systems to enamel and dentin: a systematic review and meta-analysis of in vitro studies. Oper Dent. 2021;46(2):E80. PubMed