# 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.
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