This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
The design of choice for endodontic microsurgery is the: 
Select and explain. 
A. Sulcular flap., B. Sulcular partial-thickness flap., C. Sulcular full-thickness flap., D. Envelope flap.
C: Sulcular full-thickness flap.
Answer: C: Sulcular full-thickness flap. 
Explanation: The design of choice for endodontic microsurgery is the sulcular full-thickness flap
The mucogingival flap or Luebke-Ochsenbein flap is preffered for crowned anterior teeth for esthetic reasons. This flap which includes scalloped horizontal incision provides a guide for meticulous repositioning of the flap.
The first known record for endodontic flaps was by Partsch. He is credited with the Partsch incision or semilunar incision. It is a submarginal curved flap. There is limited surgical access, proor wound healing, and laximum disruption of the blood supply to the adjacent tissues.