Expanded Function Dental Assistant (EFDA) Board Practice Exam

Glass ionomer is commonly used for Class V restorations due to its unique properties that make it well-suited for these types of cavities, which typically occur at the gum line or in areas subjected to a high degree of stress from forces during chewing.

Class V restorations are often needed in the cervical area of the tooth, where enamel and dentin meet. The glass ionomer material adheres well to both dentin and enamel, making it an excellent choice for these specific areas. Additionally, glass ionomer releases fluoride, which can help to inhibit further decay and provides a certain level of protection to the surrounding tooth structure.

In contrast, full crowns generally require stronger materials like porcelain or metal for durability and aesthetic reasons. Class I and Class II restorations typically utilize materials such as amalgam or composite resins for their strength and resistance to wear, which is crucial in areas of significant occlusal force. Thus, within the context of restorative dentistry, glass ionomer is specifically favored for Class V restorations, highlighting its role in providing a biocompatible and adhesive solution for the restoration of these vulnerable areas.