Polyacrylic Acid Dentin Conditioning — NDEB AFK MCQ
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Correct answer: B — To remove the smear layer and expose collagen for GIC chemical bonding without excessively demineralising the dentin surface
Polyacrylic acid (10-20%) is used as a dentin conditioner before GIC placement. It removes the smear layer, exposing the hydroxyapatite and collagen of the dentin surface for chemical (ionic) bonding with the carboxyl groups of the polyacrylic acid in the GIC. Unlike 37% phosphoric acid (which demineralises dentin deeply), polyacrylic acid provides a mild, controlled treatment that removes the smear layer without excessively exposing dentinal tubules, reducing the risk of post-operative sensitivity. Application time is 10-20 seconds.
Reference: Anusavice – Phillips' Science of Dental Materials, 13th ed., 2022