Prosthodontics & Occlusion · patient case question
Which luting agent should be used for this lithium disilicate crown?
Patient case: Ceramic Crown Delivery
demo: 38-year-old male
chief: Delivery of a lithium disilicate crown on tooth #30.
history: Bruxism. Existing crown on #6 has become discolored at the margin.
meds: None
findings: Lithium disilicate crown returned from the laboratory. Adjacent tooth #6 shows a grey marginal discoloration beneath a ceramo-metal crown.
Show answer and explanation
Correct answer: D. Resin cement
- A. Zinc oxide-eugenol is a provisional cement, and eugenol inhibits resin polymerization.
- B. Zinc phosphate has no adhesive bond to ceramic and would leave the restoration mechanically unsupported.
- C. Glass ionomer is acceptable for zirconia and metal but does not develop the bond that glass-ceramics require.
- D. Correct. Lithium disilicate is adhesively cemented with resin cement after HF etching and silane coupling. The resin bond reinforces the ceramic and substantially raises fracture resistance.
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