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Protocols

Crown Cementation Protocol

Predictable. Repeatable. Doable.

21 April 2026 restorativeprosthodontics

For a while my crown results stressed me out. Same materials, same steps, but I never felt confident in what I was getting. It turned out I was skipping three things I thought didn’t matter: rubber dam for every adhesive cementation, actually following the RelyX protocol, and photographing every case.

This is the full protocol I use now. It comes down to three principles: control the field, follow the chemistry, document everything.

Step-by-step

1. Anaesthesia Achieve adequate anaesthesia before starting. A comfortable patient is a controlled procedure.

2. Rubber dam placement

  • Place the dam so adjacent teeth are exposed.
  • Non-negotiable for adhesive cementation.
  • Field contamination is invisible. You won’t know it was a problem until the bond fails six months later.

3. Temporary removal

  • Remove the temporary carefully with artery forceps so you don’t disturb the preparation.

4. Prep cleaning

  • Clean the preparation thoroughly and remove all temporary cement residue.

5. Crown try-in

  • Check fit, margins and contacts before cementation.
  • Address any issues now, not after you’ve cemented.

6. Surface preparation (ceramic / zirconia)

  • Hydrofluoric acid etch the intaglio surface (ceramic only, not zirconia).
  • Rinse thoroughly.
  • Apply silane, rinse thoroughly, and allow to dry completely.

7. Adjacent tooth protection

  • Place PTFE tape on adjacent teeth.
  • Protects against etch and cement contamination, so margins are cleaner and finishing is quicker.

8. Adhesive protocol

  • Acid etch the enamel margins.
  • Apply Scotchbond Universal to both the preparation and the crown intaglio surface.
  • Follow manufacturer timing. Don’t rush this step.

9. Cementation

  • Load the crown with RelyX Universal and seat fully.
  • Brush excess cement towards the margins. It helps fill marginal voids and improves aesthetics.
  • Floss interproximally to clear contacts.

10. Curing: two options

Option A: full wait (preferred)

  • Tack cure to stabilise, remove gross excess.
  • Wait 6 minutes for full self-cure.
  • Ensures even, well-distributed setting, so there’s no risk of disrupting uncured resin with ultrasonic instrumentation.

Option B: full light cure

  • Cure every surface for 10 seconds.
  • Use when time is limited. Be thorough and don’t skip surfaces.

11. Rubber dam removal

  • Cut the dam through the contacts. Don’t pull it through.
  • Remove carefully to avoid dislodging the crown.

12. Excess removal

  • Remove any cement that tracked under the rubber dam.
  • Ultrasonic scaler interproximally and around all margins.
  • Residual cement is a periodontal risk, so check thoroughly.

13. Occlusal check

  • Check occlusion in all excursions and adjust as required.

14. Radiographic confirmation

  • Take a bitewing to confirm complete seating and check interproximal margins.

15. Clinical photography

  • Photograph the final result.
  • The camera catches things your eyes miss chairside.
  • Reviewing your own photos is how you improve.

Materials

  • Rubber dam
  • PTFE tape
  • Scotchbond Universal (adhesive)
  • RelyX Universal (cement)
  • HF acid (ceramic cases only)
  • Silane (ceramic cases only)

A note on the 6-minute wait

The decision between waiting for full self-cure and light curing every surface comes down to confidence and time. When I wait the full 6 minutes, I know the resin has set evenly throughout. I’m not relying on light penetration reaching every area of the cement film. Going in with an ultrasonic scaler on partially cured resin risks disrupting the bond. If you have the time, wait.

This is the protocol I use. Materials and timings are what work for me — check your own manufacturers’ instructions and adapt to your case.