Why is dual-cure composite preferred for restoring an endodontic access cavity over light-cured composite alone?

Correct answer: A. Greater depth of cure where light cannot reach

• A. ✅ Correct. Endo access cavities are deep with internal walls and undercuts where light cannot penetrate adequately. Dual-cure composite has both light-activated and chemical self-cure components, ensuring full polymerization throughout the depth of the access cavity.
• B. ❌ Esthetics are similar; the reason is functional.
• C. ❌ Flexural strength is not why dual-cure is specifically chosen for endo access.
• D. ❌ Marginal seal is not the primary rationale — depth of cure is.