What type of cement cannot be used under a bonded restoration?

Zinc oxide-eugenol (ZOE) cement should not be used under a bonded restoration primarily due to its properties and chemical interactions. ZOE is known for its ability to provide a soothing effect on the pulp and has antiseptic properties, but it does not bond well to the tooth structure or the restoration material. The primary concern with using ZOE under a bonded restoration is that it interferes with the bonding process.

For a restoration to maintain its integrity and durability, it is crucial that the bonding agent can effectively bond to both the tooth substrate and the restoration material. ZOE's lack of adhesion can lead to microleakage, potential failure of the restoration, and issues with longevity. The bonding agents used in modern adhesive dentistry require a substrate that allows for micromechanical retention, which ZOE does not provide.

In contrast, other options like glass ionomer cement, composite resin cement, and zinc phosphate cement have properties that allow for better bonding capabilities. Glass ionomer and composite resin cements are specifically designed to be compatible with bonded restorations, promoting effective adhesion and minimizing issues related to microleakage. Zinc phosphate cement, while traditionally used, also provides better structural support and can work with certain bonding techniques, even if it