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Prosthodontics & Occlusion · single question

Which cement is MOST appropriate for cementation of a ZIRCONIA crown?

  1. Polycarboxylate cement
  2. Resin-modified glass ionomer (RMGI) or dual-cure resin cement — both provide good bonding to zirconia with surface treatment
  3. Temporary cement only
  4. Zinc phosphate cement
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Correct answer: B. Resin-modified glass ionomer (RMGI) or dual-cure resin cement — both provide good bonding to zirconia with surface treatment

  • A. Polycarboxylate provides some bonding to tooth structure but is outdated for crowns.
  • B. Correct. Zirconia crowns require RESIN-BASED CEMENTS (RMGI or dual-cure resin cement) because: (1) zirconia cannot be etched with HF acid (unlike silica-based ceramics), (2) a primer containing phosphate monomers (10-MDP) is used to chemically bond resin to zirconia, (3) RMGI provides adequate bond strength and self-adhesive variants simplify technique. RMGI is commonly cited in recall exams as the answer for zirconia cementation.
  • C. Temporary cement is only for provisionals — not for definitive zirconia crowns.
  • D. Zinc phosphate is a traditional cement with no chemical bonding to zirconia — not ideal.

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