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Why Super Glue Should Never Be Used on Porcelain Crowns
Why It Fails
- Bond strength: Cyanoacrylate (super glue) ~20–30 MPa shear; dental cements (resin-modified glass ionomer, resin cements) 15–30 MPa but with superior durability, fatigue resistance, and marginal seal.
- Degradation: Super glue hydrolyzes in saliva → bond failure.
- Toxicity: Formaldehyde release; irritant to pulp and mucosa.
- Rigidity: No shock absorption → ceramic fracture risk.
- Marginal gap: Cannot achieve precise fit → microleakage → recurrent decay, sensitivity.
Proper Cementation
- Try-in, clean, etch (if indicated), silane, bond, cement.
- Cements: RelyX Unicem, Panavia, FujiCEM, GC Cement, etc.—selected by material (lithium disilicate, zirconia, PFM) and clinical situation.
- Light-cure + self-cure dual-cure ensures deep polymerization.
If a Crown Comes Off
- Keep it safe; do NOT glue it yourself.
- Call dentist immediately (same day if possible).
- Temporary: Denture adhesive (Fixodent) or temporary cement (TempBond) from pharmacy—only until professional recementation.
- Avoid chewing on that side.
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