PGCEE MDS 2022: Poor accessibility is the main disadvantage of which flap?

# Poor accessibility is the main disadvantage of which flap?

a) Trapezoid

b) Envelope

c) Semilunar

d) Partial thickness flap

The correct answer is C. Semilunar flap.

Basic requirements of a flap:

• Flap must be designed to provide adequate exposure to the surgical area.

• Flap must have a broad base and good vascular supply.

• When placed back, the flap should rest on healthy bone.

Envelop flap: Incision along the free gingival margin with no vertical incision

A two-sided triangular flap is an envelop flap with a releasing incision on one side.

A three-sided rhomboid flap is a modification of a two-sided flap with the addition of a second vertical incision.

Semilunar flap: is designed when the periapical area is required to be exposed. It is always kept 5 mm away from the gingival margin.