National Dental Assisting Examining Board (NDAEB) Practice Exam

What is primarily achieved by placing a dental liner in a cavity prep?

1. Enhancing the strength of the filling

2. Preventing secondary decay

3. Protecting the pulp from irritation

4. Improving the visual appearance of the filling

The correct answer is: Protecting the pulp from irritation

Placing a dental liner in a cavity preparation is primarily done to protect the pulp from irritation. This is crucial because the dental pulp, which contains nerves and blood vessels, can be sensitive to various stimuli, including thermal changes, chemical irritants, and mechanical forces. The liner acts as a barrier between the restorative material and the pulp, thus shielding it from potential damage that can lead to pain or complications, such as pulpal necrosis. Furthermore, dental liners are often made of materials that have thermal insulation properties and can help in neutralizing acidity or irritation from the restoration material. By ensuring that the pulp is adequately protected during and after the placement of restorations, the long-term health of the tooth can be maintained, reducing the risk of further dental issues. While enhancing the strength of the filling, preventing secondary decay, and improving the visual appearance of the filling may also be considerations in dental procedures, they are not the primary goal of using a dental liner in cavity preparations. The liner's main purpose centers on safeguarding the health and vitality of the dental pulp.