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Restorative & Materials · single question

When cementing a porcelain veneer, what is the correct order of procedures?

  1. Silane on veneer → HF acid on veneer → etch tooth → bond tooth → cement
  2. HF acid on tooth → silane on tooth → etch veneer → bond veneer → cement
  3. HF acid on veneer → silane on veneer → etch tooth → bond tooth → cement
  4. Etch tooth → bond tooth → HF acid on veneer → silane on veneer → cement
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Correct answer: C. HF acid on veneer → silane on veneer → etch tooth → bond tooth → cement

  • A. Silane is applied AFTER hydrofluoric acid etching of the veneer surface, not before.
  • B. HF acid should NEVER be used on the natural tooth — it is only for ceramic surfaces.
  • C. Correct. The correct sequence for veneer cementation is: (1) Hydrofluoric acid (HF) etches the ceramic veneer surface to create micromechanical retention, (2) Silane coupling agent is applied to the etched veneer, (3) Phosphoric acid etches the enamel on the tooth, (4) Bonding agent is applied to the tooth, (5) Resin cement bonds the veneer to the tooth.
  • D. HF acid and silane are applied to the VENEER, not the tooth. Phosphoric acid etches the tooth.

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