ZOE and Composite Incompatibility — NDEB AFK MCQ

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ModerateRestorative DentistryZOE and Composite IncompatibilityNDEB AFK

What is the primary disadvantage of zinc oxide eugenol (ZOE) as a temporary restoration material when a resin composite restoration is planned as the definitive restoration?

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Correct answer: E — Eugenol inhibits the polymerisation of resin-based materials

Eugenol (4-allyl-2-methoxyphenol) is a free radical scavenger that inhibits the polymerisation of resin-based materials (composites, resin cements, resin-modified GICs). When ZOE is used as a temporary restoration or base before a composite or resin-bonded restoration, residual eugenol contaminating the dentin surface reduces bond strength and degree of conversion. Non-eugenol temporary cements (e.g., Temp-Bond NE, TempoCem NE) should be used instead.

Reference: Anusavice – Phillips' Science of Dental Materials, 13th ed., 2022