# Flap with no vertical incision is called:
A. Triangular
B. Semilunar
C. Envelope
D. Trapezoidal
The correct answer is: C. Envelope
Basic requirements of a flap:
• Flap must be designed to provide an adequate exposure of the surgical area.
• Flap must have a broad base and good vascular supply.
• When placed back, flap should rest on healthy bone.
Envelop flap: Incision along free gingival margin with no vertical incision.
Two sided triangular flap: It is an envelop flap with a releasing incision on one side.
Three sided rhomboid flap: It is modification of two sided flap with addition of a second vertical incision.
Semilunar flap: is designed when periapical area is required to be exposed. It is always kept 5mm away from the gingival margin.
Pedicle flap; It is a flap based on a particular blood vessel. Eg:- Palatal flap along the length of greater palatine artery.
Random flaps: Flaps that are not based on a specific blood vessel.
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