Resin infiltration in MID is primarily used for which type of lesion?

• A. Large cavitated lesions
• B. Whitening discolored enamel
• C. Root planing
• D. Early non-cavitated lesions to arrest progression

Answer: (D)

Resin infiltration works by penetrating the porous structure of an early caries lesion and sealing it so acid diffusion and bacterial activity are blocked. This approach halts progression without removing tooth structure, which is why it’s particularly suited for non-cavitated or white-spot lesions where the enamel porosity is still intact and accessible to capillary flow. By filling those micro-porosities with low-viscosity resin, the lesion is stabilized, allowing natural remineralization processes to rebalance the mineral content while preventing further decay.

Large cavitated lesions require structural restoration because there is loss of tooth tissue and a sealed, impervious resin cannot restore that missing structure. Whitening discoloration addresses aesthetics, not caries control. Root planing targets infected root surfaces in periodontal disease, not caries arrest. So resin infiltration’s role is最 effectively for early non-cavitated lesions to arrest progression.