What is the primary purpose of adding wax to an alginate tray?

The primary purpose of adding wax to an alginate tray is to protect tissue from injury and provide comfort. When taking impressions, the alginate material can exert pressure on the soft tissues of the mouth. By adding wax, the tray is modified to create a barrier that helps distribute pressure more evenly, reducing the risk of discomfort or injury to the oral mucosa. This adjustment improves the patient’s experience during the impression-taking process.

While the other options mention aspects such as aesthetics, weight, and handling ease, they do not address the fundamental need for patient comfort and safety, which is paramount in dental procedures. The addition of wax primarily serves to prioritize the well-being of the patient while obtaining accurate impressions.