What bonding mechanism do sealants primarily use after etching?

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Multiple Choice

What bonding mechanism do sealants primarily use after etching?

Explanation:
Micromechanical bonding is the mechanism at play when sealants adhere after etching. Phosphoric acid creates a rough, porous enamel surface, and the low-viscosity resin sealant flows into these microscopic pores. When the resin polymerizes, it forms numerous resin tags that interlock with the etched enamel, providing retention through mechanical interlock rather than a chemical reaction. This is why the practitioner’s technique—proper etching duration and ensuring the resin can penetrate the pores—is crucial for strong sealant retention. Covalent or ionic bonding would imply chemical interactions with enamel that aren’t the primary means of adhesion for typical resin sealants.

Micromechanical bonding is the mechanism at play when sealants adhere after etching. Phosphoric acid creates a rough, porous enamel surface, and the low-viscosity resin sealant flows into these microscopic pores. When the resin polymerizes, it forms numerous resin tags that interlock with the etched enamel, providing retention through mechanical interlock rather than a chemical reaction. This is why the practitioner’s technique—proper etching duration and ensuring the resin can penetrate the pores—is crucial for strong sealant retention. Covalent or ionic bonding would imply chemical interactions with enamel that aren’t the primary means of adhesion for typical resin sealants.

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