Mercury Release in Dental Procedures Involving Amalgam

Mercury is a key component of dental amalgam, and its release during various dental procedures has been a topic of concern due to potential health risks. Understanding the amounts of mercury released during different stages of amalgam handling is essential for dental professionals to implement safety measures and minimize exposure.

1. Mercury Release Quantification

A. Trituration

• Amount Released: 1-2 µg
• Description: Trituration is the process of mixing mercury with alloy particles to form a homogenous amalgam. During this process, small amounts of mercury can be released into the air, which can contribute to overall exposure.

B. Placement of Amalgam Restoration

• Amount Released: 6-8 µg
• Description: When placing an amalgam restoration, additional mercury may be released due to the manipulation of the material. This includes the handling and packing of the amalgam into the cavity preparation.

C. Dry Polishing

• Amount Released: 44 µg
• Description: Dry polishing of amalgam restorations generates the highest amount of mercury release among the listed procedures. The friction and heat generated during dry polishing can vaporize mercury, leading to increased exposure.

D. Wet Polishing

• Amount Released: 2-4 µg
• Description: Wet polishing, which involves the use of water to cool the restoration during polishing, results in significantly lower mercury release compared to dry polishing. The water helps to capture and reduce the amount of mercury vapor released into the air.