Which factor most influences the retention of a sealant?

• A. Tooth shade
• B. Gingival health
• C. Enamel dryness and cleanliness
• D. Presence of calculus

Answer: (C)

Retention of a sealant hinges on the bonding to etched enamel, which requires a clean, dry surface so the resin can properly wet and penetrate the enamel’s micro-porosities. Any moisture or contaminants—saliva, blood, plaque, or debris—interfere with wetting and resin penetration, weakening the bond and increasing the chance of debonding or microleakage. Removing calculus and achieving a dry, clean field allows the sealant to flow into the etched enamel and cure effectively, producing durable attachment. Tooth shade and gingival health don’t directly affect the bonding mechanism; they may affect isolation practicality, but the key factor for retention is enamel dryness and cleanliness.