HESI General Chairside Assisting Practice Exam

Which dental cement is specifically used as a low strength base in a restoration?

1. Zinc oxide Eugenol

2. Glass ionomer cement

3. Composite resin cement

4. Glycerin-based phosphoric cement

The correct answer is: Zinc oxide Eugenol

Zinc oxide eugenol is specifically recognized for its properties that make it suitable as a low-strength base in dental restorations. This type of cement has a soothing effect on the dental pulp, which is particularly beneficial in situations where there may be pulp sensitivity due to cavity preparation or the proximity to pulp tissue. Zinc oxide eugenol adheres well to tooth structure and has a mild buffering effect, which can help protect sensitive pulpal tissues. In contrast, glass ionomer cement, while also used in various restorative applications, typically offers higher strength and has fluoride-releasing properties, making it more suited for use as a permanent cement rather than as a low-strength base. Composite resin cement is primarily designed for bonding composite materials and provides a strong bond, which does not align with the need for a low-strength base. Glycerin-based phosphoric cement is not commonly referenced as a low-strength base; it is generally intended for use as a high-strength cement for permanent binding in prosthetic dentistry. Understanding the unique characteristics of zinc oxide eugenol helps clarify its optimal use as a low-strength base, particularly in providing temporary protection and comfort in restorative procedures.