During flap elevation, where should you start the elevation?

• A. Corners
• B. Apex
• C. Base
• D. Margin

Answer: (A)

Starting the flap elevation at the corners gives you the most forgiving entry points to release the mucoperiosteal flap. The line-angle areas are where the flap can detach with less resistance, so you can establish a clean, free edge right away and create a stable leading edge to guide the reflection toward the apex. This approach helps you develop the correct plane without tearing the delicate marginal tissue and while keeping the base attached, which preserves blood supply from the periosteum as you continue the reflection. Beginning at the apex or margins tends to put more tension on the flap early, makes the tissue harder to mobilize, and increases the risk of tearing or compromising perfusion. So, corners are the best starting point to control the reflection safely and effectively.