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Periodontics · single question

What is the difference between a FULL-THICKNESS flap and a PARTIAL-THICKNESS flap in periodontal surgery?

  1. Full-thickness includes connective tissue; partial-thickness does not
  2. Full-thickness includes mucosa only; partial-thickness includes periosteum
  3. Full-thickness includes submucosa; partial-thickness includes mucosa only
  4. Full-thickness includes the periosteum; partial-thickness does not
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Correct answer: D. Full-thickness includes the periosteum; partial-thickness does not

Full-thickness (mucoperiosteal) flap: the flap includes mucosa, submucosa, AND periosteum — providing full access to underlying bone. Partial-thickness (split-thickness) flap: the flap includes only mucosa and a portion of connective tissue — the periosteum is left on the bone. The KEY distinguishing feature is the PERIOSTEUM. Full-thickness = includes periosteum. Partial-thickness = periosteum remains on bone.
  • A. CORRECT. The distinguishing feature is the periosteum — full-thickness includes it (exposing bone), partial-thickness does not (periosteum stays on bone).
  • B. Incorrect. Both flap types include connective tissue — the distinction is about the periosteum, not connective tissue alone.
  • C. Incorrect. Full-thickness includes mucosa + submucosa + periosteum (not mucosa only). This describes the reverse of the correct answer.
  • D. Incorrect. Both flap types include the mucosa. The distinction is specifically about periosteum inclusion, not submucosa.

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