What material is placed in a thick layer between the tooth and the restoration to support it against occlusal stresses?

The correct choice for the material that is placed in a thick layer between the tooth and the restoration to support it against occlusal stresses is high-strength base. High-strength bases are designed to provide thermal insulation and mechanical support beneath restorations, particularly in cases where the tooth structure has been significantly compromised. By creating a barrier, these materials can help distribute occlusal forces more evenly across the dental substrate and mitigate the risk of further injury or damage to the tooth.

High-strength bases are usually made from materials like glass ionomer or resin-modified glass ionomer, which not only support the restoration but also bond chemically to both the tooth and the restorative material, enhancing the overall longevity and stability of the dental restoration.

In contrast, cavity liners are used primarily to protect the pulp from chemical irritation in shallow cavities and may not provide sufficient bulk or support for occlusal stresses. Dental cement serves various purposes, including the adhesion of crowns or bridges but is not specifically meant to act as a thick support layer. Temporary fillings are designed to serve as interim restorations while allowing for future treatment but do not offer the same level of support needed for long-term occlusal stability.