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Oral Surgery · single question

When designing a surgical flap, the incision margins should be positioned so that, on closure, they rest on:

  1. Sound (intact) bone
  2. The defect/bony void
  3. Mobile mucosa only
  4. An extraction socket
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Correct answer: A. Sound (intact) bone

  • A. Correct. Flap margins should rest on SOUND bone so the wound edges are supported and heal predictably; placing the margin over a defect risks dehiscence and breakdown.
  • B. Margins over a bony defect/void are unsupported and prone to breakdown.
  • C. Resting solely on mobile mucosa gives poor support and tension.
  • D. Closing directly over an open socket leaves the margin unsupported.

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