National Dental Assisting Examining Board (NDAEB) Practice Exam

Can varnish be placed under all restorative materials?

1. Yes, under all types of materials

2. No, only under certain materials

3. No, only under amalgam

4. Yes, but only temporarily

The correct answer is: No, only under amalgam

The application of varnish in dental procedures primarily serves as a protective layer under restorative materials. Varnish is commonly used under amalgam restorations to seal dentinal tubules and reduce post-operative sensitivity. This is particularly beneficial because amalgam can exert pressure on the tooth structure, and the varnish can help mitigate any potential irritation. However, varnish cannot be placed under all restorative materials, particularly those that have the ability to bond chemically with tooth structure, such as composite resins. These materials often require a cleaner surface free of any barriers like varnish, which can interfere with adhesion. Consequently, the ideal approach is to use varnish selectively under amalgam but not under every type of restorative material, as this varies based on the material's properties and bonding requirements. Thus, while varnish is predominantly utilized as a means of protecting the tooth before amalgam placement, it is not universally applicable to all types of dental restorative materials. This differentiation is critical in ensuring successful dental restorations and patient comfort.