Final answer:
The Semilunar flap design often limits access and results in scar formation post-periapical surgery. Other flap designs are preferred for better access and healing.
Step-by-step explanation:
In periapical surgery, the flap design that limits access to the operative site and often heals with scar formation is the Semilunar flap. This design is chosen less frequently because it can obstruct visibility and access for the surgeon and may result in more noticeable scarring due to its incision shape and location. In contrast, other flap designs such as the envelope, triangular, rectangular, and trapezoidal flaps may provide better access and typically have a more favorable healing profile with less scarring.