Why is moisture control important in MID procedures?

• A. Prevents contamination and improves bonding
• B. It has no effect
• C. It increases the risk of caries
• D. It is only necessary for impressions

Answer: (A)

Moisture control is essential because the success of adhesive MID procedures hinges on a clean, properly prepared surface that can form a strong bond with enamel and dentin. Saliva, blood, or moisture contaminates the tooth and introduces substances that interfere with resin infiltration, dilute adhesive components, and hinder polymerization. When bonding is compromised, the hybrid layer and resin tags don’t form well, leading to poor marginal seals, microleakage, and premature restoration failure. Controlling moisture therefore directly improves bonding quality and durability. It isn’t just about impressions, and moisture does have a real effect on bonding, not a negligible one.