How does the thickness of obturation material and the presence of voids influence long-term prognosis?

• A. Voids improve bacterial ventilation.
• B. Thickness has no impact on prognosis.
• C. Inadequate fill or voids create channels for microleakage and reinfection, compromising seal and healing; aim for a dense fill with no voids.
• D. Only apical size matters.

Answer: (C)