HESI General Chairside Assisting Practice Exam

Which cavity liner is most effective for the formation of reparative dentin?

1. Calcium hydroxide

2. Glass ionomer

3. Composite resin

4. Resin ionomer

The correct answer is: Calcium hydroxide

Calcium hydroxide is recognized for its ability to stimulate the formation of reparative dentin, making it a highly effective choice as a cavity liner. This liner has a unique capability to promote the activity of odontoblasts, the cells responsible for dentin formation. When placed in a cavity preparation, calcium hydroxide encourages the formation of a secondary or reparative dentin layer to protect the dental pulp from potential injury caused by caries or restorative procedures. In addition to promoting reparative dentin formation, calcium hydroxide possesses antimicrobial properties, which help reduce the risk of pulp infection. It also has a high pH value, which contributes to an environment conducive to healing and promotes the remineralization of tooth structure. These qualities make it particularly valuable in scenarios where pulp exposure is a concern or where preserving pulp vitality is crucial. Other cavity liners, such as glass ionomer, composite resin, and resin ionomer, have their own benefits and uses but do not equally match the specific effectiveness of calcium hydroxide in promoting reparative dentin. Glass ionomer provides some fluoride release and bonds to dentin but is primarily used for its restorative qualities rather than reparative capabilities. Composite resins and resin ionomers serve as restorative materials, focusing on aesthetic