PFM Survey Crown Template

Survey Crown — Form 26 (Crown Prep)

Chairside Form 26 for a PFM survey crown on [tooth __] — the crown-prep procedure itself (not the full RPD sequence). Copy-pastable appointment steps below.

Two signatures required

Form 26 = reconstructive phase. You need 2 signatures — prosth specialist AND clinic coordinators. No aesthetic work on this form.

Design & material (survey crown)

A survey crown is contoured to receive the RPD: built-in rest seat, guide plane, correct height of contour and undercut. Aim for metal-on-metal where the clasp engages.

• Keep the rest seat + coping (clasp/rest contact) in metal — avoids over-reduction; porcelain cut-back on the buccal only.
• Size the built-in undercut to the framework alloy: CoCr 0.25 mm, cast gold / wrought wire 0.50 mm, stainless steel 0.75 mm (L6 Dental Surveyor).
• Allow extra occlusal reduction for the rest-seat metal thickness.

When in the RPD it's made

Decided at the diagnostic survey & design; made and cemented before the master impression and framework — the framework is surveyed and cast against the finished crown (Clinical Sequence for Partial Dentures).

Appointment 1 — Tooth investigation & prep

• Local anaesthesia
• Shade selection and crown design (rest seat / guide plane / undercut for the RPD)
• Putty key off the study model (records pre-op contour)
• Remove existing crown/restoration
• Assess remaining tooth structure and restorability
• Composite core build-up under rubber dam
• Tooth prep for PFM crown — reduce by zone (see schematic): occlusal ~2.0 mm (1.5 mm functional cusp bevel), axial 1.0–1.2 mm at 6–10° taper, margin facial shoulder 1.0–1.2 mm / lingual chamfer + metal collar

• Retraction — double cord technique
• Secondary impression: light body on tooth, heavy body in tray
• Bite registration with Regisil
• Temporary with Luxatemp, cement with TempoCem
• Check occlusion

+1.5 — On receiving labwork (before Appt 2)

Check on the die/master cast: stability, retention, occlusion, aesthetics, contacts, seating on die, internal fit and margins.

Appointment 2 — Try-in & cementation

• Remove temporary crown and clean remaining cement with pumice
• Check contacts, seating, margins, stability, retention and contour
• Check occlusion and aesthetics
• If no problems → cement with RelyX under rubber dam (13A clamp), then remove dam
• Check occlusion
• Post-op instructions and OHI

Copy-pastable checklist

PFM SURVEY CROWN — [tooth __] — RPD framework alloy: [Co-Cr / cast gold / wrought wire / stainless steel]

DESIGN
- The survey crown is contoured to receive the RPD, so it carries a built-in rest seat, a guide plane, the correct height of contour and the correct undercut, with metal-on-metal where the clasp engages.
- Keep the rest seat and the clasp and rest contact in metal, and cut the porcelain back on the buccal only.
- Size the built-in undercut to the framework alloy: Co-Cr 0.25 mm, cast gold or wrought wire 0.50 mm, stainless steel 0.75 mm.

APPOINTMENT 1 — TOOTH INVESTIGATION AND PREP
- Give local anaesthesia.
- Select the shade and settle the crown design, covering the rest seat, the guide plane and the undercut for the RPD.
- Take a putty key off the study model, which records the pre-op contour.
- Remove the existing crown or restoration.
- Assess the remaining tooth structure and the restorability.
- Build up the composite core under rubber dam.
- Prep the tooth for a PFM crown, reducing by zone as shown in the schematic, and add extra occlusal reduction for the rest-seat metal thickness.
    Reduce the occlusal surface by about 2.0 mm, including a 1.5 mm functional cusp bevel.
    Reduce axially by 1.0 to 1.2 mm at 6 to 10 degrees of taper.
    Prepare the margin as a facial shoulder of 1.0 to 1.2 mm, and as a lingual chamfer with a metal collar.
- Check before the impression that the rest seat, the guide plane, the height of contour and the undercut are all present on the prep as designed.
- Retract using the double cord technique.
- Take the secondary impression with light body on the tooth and heavy body in the tray.
- Take the bite registration with Regisil.
- Make the temporary with Luxatemp and cement it with TempoCem.
- Check the occlusion.

+1.5 LAB CHECK (before Appointment 2)
- Check the following on the die and master cast: stability, retention, occlusion, aesthetics, contacts, seating on the die, internal fit and margins.

APPOINTMENT 2 — TRY-IN AND CEMENTATION
- Remove the temporary crown and clean the remaining cement with pumice.
- Check the contacts, the seating, the margins, the stability, the retention and the contour.
- Check the occlusion and the aesthetics.
- If there are no problems, cement with RelyX under rubber dam using a 13A clamp, then remove the dam.
- Check the occlusion.
- Give post-op instructions and OHI.

Clinical Stages and Authorisation

Each stage requires date, signature, and clinical code (2 signatures — prosth specialist + clinic coordinator).

1. DISCUSSION (design, abutment, mounting needs) — date / sign / code:
2. FORM 26 signed – CC — date / sign / code:
3. PREP and FINAL IMPRESSION — date / sign / code:
4. TRY IN (die/master cast check) — date / sign / code:
5. INSERTION (cementation) — date / sign / code:

Authorisation

• Procedure Outline Authorised by:
• Clinician ID:
• Date: