Why is moisture control critical when using resin-based restorations in MID?

• A. Moisture can compromise bonding, leading to restoration failure; GIC-based materials are more tolerant of moisture
• B. Moisture improves bonding
• C. Moisture has no effect on bonding
• D. Resin-based restorations tolerate moisture better than cement

Answer: (A)

Moisture control is essential for resin-based restorations because bonding to dentin and enamel requires a dry, uncontaminated surface to form a reliable adhesive interface. Water or saliva disrupts resin infiltration and the formation of the hybrid layer, can cause collagen fibers to collapse, and promotes phase separation of hydrophobic resin components, all of which weaken bond strength. A compromised bond increases the risk of marginal leakage, secondary caries, and restoration failure. Glass ionomer cements, by contrast, tolerate moisture better because they chemically bond to tooth structure and can set in the presence of some moisture, though they behave differently in terms of strength and esthetics. Thus, keeping the field dry is crucial when using resin-based materials to ensure optimal bonding and restoration longevity.