The BEST restorative option after endodontic treatment of a mandibular first molar is:

Correct answer: D. Full coverage crown (provides best long-term protection against fracture)

• A. Amalgam provides better wear resistance than composite but still does not provide the cuspal coverage protection of a crown.
• B. Leaving an endodontically treated molar without full coverage significantly increases fracture risk.
• C. Composite resin provides inadequate cuspal protection for a molar — insufficient for long-term use as the sole restoration post-endo.
• D. Correct. After endodontic treatment, posterior teeth (especially molars) are at HIGH RISK for fracture because: (1) significant tooth structure is lost through caries and access preparation, (2) the tooth becomes more brittle without pulp hydration, (3) molars sustain high occlusal forces. FULL COVERAGE CROWN is the gold standard restoration after molar endodontic treatment to protect against cuspal fracture.