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Endodontics · single question

Which of the following is an ADVANTAGE of straight-line access in endodontic treatment?

  1. Prevents fracture of rotary files
  2. Instruments can reach the apical third of curved canals
  3. Conserves more tooth structure
  4. Ease of placement of instruments
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Correct answer: B. Instruments can reach the apical third of curved canals

Straight-line access advantages: reduces ledge likelihood, removes unsupported dentin, exposes pulp horns, and MOST IMPORTANTLY: adequate access to the canals' apical third even in curved canals. Disadvantage: removes more tooth structure. Source confirms: 'c) Instruments can reach the apical third of curved canal.'
  • A. Preventing file fracture is an indirect benefit but not the specific advantage listed.
  • B. CORRECT. Straight-line access allows instruments to reach apical third of curved canals — reduces ledging, separation, and enables complete debridement.
  • C. Conserves tooth structure = DISADVANTAGE trade-off of straight-line access — it requires MORE removal.
  • D. Ease of instrument placement is a benefit but not the specific highlighted advantage.

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