What material is required for pulp protection in preparations with near pulpal depth, in proper sequence under an amalgam restoration?

Pulp protection is essential when preparing a cavity that is close to the pulp, as it helps prevent sensitivity and possible pulpal damage. In cases where the cavity preparation is near the pulpal depth, the proper sequence for pulp protection under an amalgam restoration typically involves placing a material that provides an adequate barrier.

Zinc oxide eugenol serves as an effective base and provides some thermal insulation, making it suitable for use under amalgam restorations. Additionally, it has antibacterial properties that may aid in preventing secondary caries. When used in conjunction with copal varnish, it seals the dentin tubules, further protecting the pulp from potential irritants and moisture during restorative procedures.

Following this sequence, the copal varnish acts as a sealer to enhance the protective qualities of zinc oxide eugenol while preventing amalgam from coming into direct contact with the tooth structure, thereby reducing the risk of post-operative sensitivity. This layered approach helps ensure that the pulp remains healthy, particularly in near pulpal situations.

In contrast, while calcium hydroxide is a popular choice for direct pulp capping, it may not provide the same level of protection under amalgam restorations specifically. Glass ionomer offers some protective qualities but is typically used for a different