What is the main risk associated with moisture contamination during amalgam placement?

The main risk associated with moisture contamination during amalgam placement is inadequate bonding. When moisture is present during the setting of amalgam, it can interfere with the adhesion of the material to the tooth structure. Amalgam requires a dry field for optimal performance, as the presence of saliva or blood can lead to a reduction in the material's ability to properly bond to the cavity walls. This inadequate bonding can ultimately result in microleakage, which may compromise the restoration and lead to further decay or failure.

Moisture can affect the overall integrity of the amalgam restoration by creating a weak interface at the margins or within the material itself. This is critical because a well-bonded restoration is key to preventing issues such as marginal leakage, which may lead to secondary caries, as well as ensuring the longevity of the restoration.

Other factors, like strength and aesthetics, are not enhanced by moisture presence; in fact, moisture can adversely affect the physical properties of amalgam. Delayed expansion typically relates to issues within the material concerning the reaction process rather than moisture contamination directly impacting bonding capabilities. Understanding the importance of a dry work environment when placing amalgam helps ensure successful dental restorations.