Adhesives allow which of the following around restorative materials?

• A. Bacterial growth
• B. Increased strength
• C. Faster curing
• D. Reduced solubility

Answer: (A)

The key idea is that the tooth–adhesive–restoration interface must be well sealed to prevent microleakage. If the adhesive layer doesn’t form a perfect seal, tiny gaps can allow bacteria from plaque and saliva to migrate and persist at the margins. Those bacteria can colonize the crevice and form a biofilm around the restoration, which can lead to recurrent decay, sensitivity, and potential pulpal irritation. So, bacterial growth around the restoration is what can occur when the adhesive does not provide an adequate seal. The other potential effects—increased strength, faster curing, or reduced solubility—are improvements desired with proper bonding, but they describe performance of the materials themselves rather than what happens at the interface if sealing fails.