Temporary Front Tooth Case: A PMMA Provisional for Tooth 8 Before the Final Zirconia Crown

The backstory on the tooth itself: a root fracture below the gum line, running vertically into the mid-root. The clinician's note said the fracture was identified during a follow-up appointment weeks after a minor trauma. There was no realistic way to save the tooth. The clinician extracted it atraumatically to preserve the labial plate, placed an implant with a healing abutment at the same visit, and set the patient on an osseointegration timeline of roughly four months before the final zirconia crown would be fitted.

So by the time the case reached our bench, this is what we had on paper and in the digital files:

Clinical picture

• Fresh implant in position 8, placed about seven days before our files arrived
• Healing abutment seated, screw-retained, no load allowed during the osseointegration period
• Soft tissue still remodeling around the healing cap — slight edema on the labial side at the time of the scan, with the papillae on either side intact but not yet fully filled in
• Thick gingival biotype on the labial, which gave us some tolerance on emergence profile but also meant the tissue would react visibly to any pressure
• Adequate band of keratinized tissue around the implant
• No bone graft noted; the socket preservation relied on the atraumatic extraction and the immediate implant placement

Adjacent and opposing teeth

• Tooth 9 (upper left central incisor, FDI 21) in good shape, with a distinct cervical warmth and a translucent incisal edge — this was going to be the reference for shade and shape
• Tooth 7 (upper right lateral, FDI 12) was intact, with a slightly rotated distal corner that the clinician asked us to leave untouched
• Opposing arch stable, Class I occlusion, canine-protected lateral excursion
• No signs of parafunction on the opposing wear facets

What the dentist asked for

The prescription was short but every line mattered. We read it three times before touching the file.

The core requirements:

1. PMMA provisional for tooth 8, screw-retained style, matched to the adjacent central (shade and incisal translucency to be read from tooth 9).
2. Zero occlusal contact in centric and protrusive. The implant was still integrating and could not take any load.
3. No pressure on the healing abutment. The intaglio had to clear the healing cap, not rest on it.
4. Emergence profile aligned with the planned final crown, not with the shape of the extraction socket. The clinician had already done a digital wax-up of the final restoration and wanted the provisional to start shaping the soft tissue toward that end state.
5. Shade split: cervical slightly warmer than the body, incisal edge with a thin translucent halo to match the neighbor.
6. Clean, polished intaglio. No micro-roughness anywhere the tissue would touch.
7. Delivery in under four working days so the patient could be seated the same week.

The timing was tight but doable. Our standard PMMA try-in stage runs 2–4 working days (Istar case workflow timelines), and we had the digital files in hand, no shipping delay on physical models.

The real work was in points 2–4. Shape, pressure, and load are three different things, and the prescription spelled out all three separately. That is unusual, and it tells you the clinician had thought this through.

How we built it

We approach an anterior PMMA provisional as a soft-tissue tool, not a placeholder tooth. That changes what we do on the bench. Below is the step-by-step. The order is the same one we follow on cases like this every week.

Step 1 — Reviewing the digital files

The case came in with an intraoral scan of the arch, the healing abutment captured on a scan body, the opposing arch, a bite registration, and the digital wax-up of the final zirconia crown. We ran our file-check routine first: scan overlap, stitching accuracy at the margins, enough coverage of the opposing dentition. Scans are expected to carry at least 30% overlap along the arch and include two to three adjacent teeth beyond the working site (digital workflow guidance).

Everything checked out. We flagged one item for the clinician before design — the scan body had a tiny area where the gum had crept over the collar, so we asked for a clean photo of the site to confirm the emergence point. The dentist sent it in about an hour.

Step 2 — CAD design, driven by the final crown

Here is the design decision that matters: the provisional does not copy the patient's old crown shape or mirror tooth 9 exactly. It copies the final-crown design that the clinician had already approved.

Our designer loaded the wax-up as the reference, then built the PMMA shell around it. The emergence profile — the part of the crown that comes out of the gum and shapes the tissue — followed the final design's curve. The cervical area was slightly concave (what we call a scalloped emergence) so the papillae on either side would have room to fill in as the tissue settled.

Three things we locked at this stage:

• Intaglio geometry: a boolean clearance around the healing abutment, so no part of the inner surface touches the cap. The design leaves a visible gap in the CAD cross-section. If you can see daylight between the shell and the abutment on screen, you have the right starting point.
• Occlusal zero: we lowered the lingual and incisal contact zones in centric and in excursive movements. The provisional sits in the arch like it belongs there, but when the patient bites down, it carries no force. We verified this on the digital articulator at both maximum intercuspation and in protrusive slide.
• Shade blueprint: cervical area built slightly warmer (A3 base), body in A2, incisal third thinner to allow a translucent effect after milling. The target shade reading came from tooth 9 under natural light, read by the clinician with a VITA guide.

Step 3 — Material and milling

We milled the provisional from a monolithic PMMA puck. For anterior temporary front tooth work, PMMA is the right choice when the patient will wear the restoration for weeks to a few months and the clinician needs shade control plus a smooth polishable surface. It is a short-term material by design — not a permanent restoration, and not meant to carry load long term (material selection guidance).

Milling settings for the anterior zone go through our senior anterior-aesthetic team. Istar runs a dedicated anterior-aesthetic workflow where high-detail cases are routed to experienced technicians by default, not left to generalist operators.

Minimum thickness held at the recommended anterior range (0.5–1.5 mm depending on the zone of the crown) to balance strength and translucency.

Step 4 — Finishing by hand

PMMA out of the mill looks correct but feels raw. The finishing stage is where an anterior provisional starts to look believable.

• Light stain application at the cervical third to lift the warmth
• A thin surface characterization to break the flat mill lines on the facial
• Incisal edge thinned slightly and polished with a progressive sequence (coarse to high-gloss)
• Intaglio polished with a dedicated small-diameter wheel, no residue, no roughness around the screw access

We check the intaglio under magnification. Any texture that could grab tissue has to go, otherwise the gum reacts even to a short-term provisional.

Step 5 — Fit check on the printed model

Before shipping, we seat the provisional on a 3D-printed model of the patient's arch with the implant analog in place. Three checks:

• Seating: does it drop onto the analog without resistance?
• Occlusal clearance: we close the model into the opposing arch and look for any contact. Nothing should mark.
• Intaglio clearance: visible gap around the healing cap area, confirmed on the model.

If any of these three fails, we go back to CAD. On this case all three passed on the first try.

Step 6 — QC and shipping

Our QC team logs the case against the prescription line by line. The checklist for anterior provisionals covers margin integrity, surface finish, shade documentation, occlusal clearance confirmation, and photo documentation of the finished restoration against a neutral background. Istar runs this stage in-house as part of a fully integrated workflow — design, milling, finishing, and QC all happen under one roof, not outsourced (in-house manufacturing).

Packed, labeled, shipped. Total lab turnaround on this case: three working days from receipt of complete files to dispatch.

The design choices we had to think twice about

A few points on this case were not obvious. They are the kind of thing the prescription does not spell out, and they need a judgment call on our side.

Choice 1 — Screw-retained, not cement-retained. For an anterior provisional over an implant, we prefer screw retention when the screw access can be hidden on the palatal side. It avoids cement residue in the sulcus, which is a known trigger for peri-implant tissue reactions. The access channel on this case sat well behind the incisal edge, so screw retention was clean.

Choice 2 — Follow the final crown, not the old crown. This is where a provisional either helps the final result or quietly works against it. If we had copied the patient's old tooth shape, the soft tissue would have remodeled toward that old emergence. Four months later, the final zirconia crown would arrive and the gum would not match. By building the provisional off the final-crown design, the tissue has four months to migrate toward the correct contour before the final restoration ever gets seated.

Choice 3 — No occlusal contact, verified twice. Clinicians sometimes write "light contact" on a provisional, meaning the patient can function. For an implant in the integration phase, that is not safe. We verified zero contact in both static and dynamic positions, and we noted it on the delivery sheet so the clinician would check again at the chair.

Choice 4 — Shade split rather than a single VITA tab. A single-tab shade on a central incisor almost never matches. We built the restoration in three vertical zones (cervical / body / incisal) with different base shades, then layered the stain by hand. On a monolithic PMMA this is more work than it sounds — the mill cuts a single puck, so the color story has to come from the raw material choice plus the finishing. We chose a multi-layer PMMA blank that already has a built-in cervical-to-incisal gradient, and the hand-finishing stage added the final warmth and translucency.

What we need from a prescription on cases like this

If you are sending us a temporary front tooth case and want to skip the back-and-forth, here is the file list we work from:

• Intraoral scan of the arch with the scan body on the implant, or a well-captured physical impression
• Opposing arch scan or impression
• Bite registration
• A shade reading from the adjacent tooth, with the lighting condition noted
• The digital wax-up of the final restoration if one exists, or at minimum a note on which direction the final crown will go (standard emergence, modified emergence, elongated, etc.)
• Occlusal prescription: zero contact for implant provisionals, or a clearly stated range
• A photo of the extraction site or healing abutment area, taken at the chair

Missing pieces cost time. If we have everything from the start, the three-working-day turnaround is realistic. If a scan is unclear or the shade reading is missing, we message the clinic and the clock pauses on our side.

The finished result

The provisional was seated the same week the files arrived. The clinician reported back after try-in: the shade dropped into place against tooth 9, the occlusion was clear in centric and in protrusive, and the intaglio had the clearance it needed over the healing cap. No chairside adjustment was required to the body of the crown. One small polish along the cervical margin was done at the chair for a cleaner tissue adaptation.

Four months later, when the implant was fully integrated, the clinician scanned the site again for the final zirconia crown. The soft tissue had settled into a scalloped line that followed the provisional's emergence profile — which was the whole point. The final design file inherited that contour, and the zirconia crown seated with the gum line already in the right place.

That is what a well-planned anterior provisional does. It is not a placeholder. It is the first version of the final restoration, and when it is built correctly, the final crown is easier for everyone — easier to design, easier to seat, easier to live with.

If you have a similar temporary front tooth case on your bench and want a lab partner that takes the provisional stage this seriously, we are open to a conversation. Our anterior-aesthetic team handles cases like this every week, and we are happy to walk through a sample workflow before you send anything over.

Feedback after try-in

Short summary of what came back from the clinician and the patient after the provisional was seated. Written as a general debrief, not transcribed from any one appointment.

From the clinician

Overall the restoration seated as designed, with no chairside remake. The main points raised in the follow-up notes were:

• Shade match against tooth 9 was described as close enough to be acceptable without any extra staining at the chair. The three-zone cervical-to-incisal gradient read correctly under both the operatory light and natural light at the window.
• Occlusion was confirmed clear in centric and in protrusive, matching what we had set on the digital articulator. The clinician re-checked lateral excursions as well and reported no interference.
• The intaglio sat over the healing abutment with the clearance we had designed in. No pressure spots on the labial mucosa when the provisional was seated and removed.
• One minor refinement at the chair: a light polish along the cervical margin for a cleaner tissue adaptation. Not a redesign item on our side, more of a routine finish before dismissal.
• Delivery timing matched the clinic's expectation and the provisional was ready ahead of the patient's public engagement.

From the patient

The patient did not go into technical detail, but the clinician's follow-up log and the patient's own comments at the one-week and one-month check-ins came back along the lines of:

• Appearance met the brief. The patient was comfortable speaking in front of groups and did not feel the restoration drew attention. The transition between the provisional and the adjacent natural teeth read as even.
• Speech normalized within the first few days. The S and F sounds that had been an issue immediately after extraction were no longer a complaint.
• Daily function — eating soft and moderate textures, drinking hot and cold — was handled without discomfort. The patient avoided biting directly into harder foods on the front teeth, as instructed.
• No sensitivity, no looseness, no change in position reported across the osseointegration period.
• At the four-month review the patient's main question was about the final crown appointment schedule, not about anything related to the provisional, which we read as the quietest kind of good feedback.

What the feedback changed on our side

Nothing on this case had to be redone, but we noted two items for our own anterior checklist going forward:

1. The three-zone shade build on multi-layer PMMA worked well enough on a central incisor that we are keeping it as the default for anterior single-unit provisionals, rather than reserving it for high-aesthetic cases only.
2. The screw access channel position — set well behind the incisal edge — made the chair-side closure easier than usual. The clinician mentioned this in passing, and it reinforces the access-angle check we already do at the CAD stage.

Neither of these is a dramatic change. That is roughly the point. On a well-planned temporary front tooth case, the feedback loop is short and the lab-side changes are small, because the heavy lifting was done before the file went to the mill.

Reference list

• Prosthodontic literature on provisional restorations in implant dentistry — Guideline on Provisional Restorations, Avens Online
• Immediate implant placement and provisionalization in the esthetic zone — PubMed Central PMC8457954
• Digital workflow with intraoral scanning and CAD/CAM PMMA — PubMed Central PMC13236874
• CAD/CAM milling vs 3D printing of PMMA, marginal fit — PubMed Central PMC9003362
• US FDA regulatory framework for dental devices — eCFR 21 CFR Part 872

Compliance note

Istar Dental Lab is a dental manufacturing facility. We fabricate restorations to the specifications provided by the prescribing clinician. Diagnosis, case planning, and the clinical decision to load an implant are the responsibility of the attending dentist. This page describes a representative lab workflow and does not report on a named patient or clinic.

Materials used in our provisionals are ISO-compliant PMMA pucks sourced from established dental material suppliers. Specific brand and batch information is available on request for registered clinic accounts.