HESI General Chairside Assisting Practice Exam

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Which component of intermediate restorative material (IRM) is known for having a soothing effect on the pulp?

Zinc oxide
Eugenol
Calcium hydroxide
Glass ionomer

The correct answer is: Eugenol

Eugenol is the component of intermediate restorative material (IRM) known for its calming effect on the dental pulp. It has natural analgesic and anti-inflammatory properties, which help to soothe irritated pulp tissues. This makes eugenol particularly advantageous in dental materials, especially for temporary restorations or when a patient has pulp sensitivity. Zinc oxide, while it serves as a base in dental materials and contributes to the overall properties of IRM, does not have the same direct soothing effect on the pulp as eugenol does. Calcium hydroxide is commonly used for its ability to stimulate the formation of secondary dentin and has therapeutic effects, but it acts primarily to protect the pulp rather than to soothe it. Glass ionomer is known for its adhesion and fluoride release properties, making it excellent for certain restorations, but it does not specifically provide the soothing effects attributed to eugenol.