Case Study: A Class III Upper Full Denture Reset at Wax Try-In — Natural Looking Dentures That Actually Looked Like Hers

Who the patient was

Woman, adult. She had been wearing a maxillary (upper) complete denture for a lot of years. Her lower arch was fully edentulous and she had never worn a lower prosthesis — the lower was out of scope for this case.

A couple of facts about her face that ended up mattering:

• Skeletal pattern: Class III. Her lower jaw sat forward relative to her upper. In a Class III face, if the upper teeth are set the way you'd set them for a Class II patient, the lips close too easily and the front teeth get hidden when she speaks and smiles.
• Reference material at intake: her existing upper denture, upper and lower impressions, a wax-rim bite record, and a frontal smile photo. No side-profile photos on the first round. That gap on the record came back to bite later.

Those three details — Class III skeletal pattern, old upper denture as a reference, and the thin photo file — are the whole story in one line.

What the dentist asked for

The original Rx was conservative and reasonable at first read:

• Full upper denture, remake. Keep the vertical dimension of occlusion (VDO) consistent with the patient's existing upper denture.
• Shade following her current upper, with a slight step toward a more natural, less uniform look at the incisal edge. Not whiter.
• Arrangement: standard setup against the lower edentulous ridge, written without a side-profile reference. The Rx assumed a routine anterior position.
• Base: heat-polymerized PMMA, standard for a full upper.
• Wax try-in required before processing. Non-negotiable.

That last line — wax try-in required — is the single most important instruction in this whole case. If this had gone straight from design to processing, the problem below would have been baked into a finished denture and the only way out would have been a full remake.

The Rx also asked for the design to be sent for approval before the final work. Our standard workflow does that for every removable case — the dentist sees the setup before anything that can't be reversed happens.

What went wrong at the first wax try-in

The first wax try-in was done against the record provided. The teeth were set, the base was waxed up, and the piece was shipped back for the dentist to try in the patient's mouth.

The feedback came back the next day with photos:

• Lips closed too far forward. When she rested her mouth, her upper lip came over the top of the central incisors — only the incisal edges peeked through.
• No teeth visible during speech or smile. The frontal smile photo now showed a lip line sitting on top of the maxillary centrals, not under them. From a conversational distance she looked like someone with no teeth at all.
• Overall "weird smile" at the try-in. The dentist's words.

On our bench, the setup was textbook for the Rx. Technically nothing was out of spec against the paperwork. But the paperwork had been written without flagging her skeletal pattern, and she was Class III. The lower ridge sitting forward of the upper, plus a conservative anterior position on the upper, dropped the whole smile line down and tucked the teeth behind the upper lip. If you'd never seen her Class III skeleton in profile, you'd set teeth exactly this way.

The miss wasn't the arrangement. The miss was that the arrangement was built from a record that didn't include side-profile photos. No matter how careful the setup is, if the record doesn't say "this is a Class III patient" and no side profile is in the file, the lab is working half-blind on the anterior.

This is why the wax try-in step exists. Shade can be adjusted later. Minor morphology can be adjusted later. Anterior position relative to the lip line cannot be adjusted later without resetting the teeth. Once wax turns into polymerized acrylic, this correction is a remake, not an edit.

The dentist flagged the same observation on his end and said he was bringing the patient back for a second wax try-in. He added that he should have shot more side-profile photos the first time. That's a candid note we see in cases where the first try-in uncovers a classification issue — the record is the real root cause.

How we reset the arrangement

Once the first try-in told us the arrangement was fighting the face, we didn't change one tooth and send it back. We reset the whole anterior.

1. Rebuilt the record first, then the teeth

Before touching the setup, we asked for one thing: side profiles at rest, at speech ("E"), and at full smile. The dentist took them during the second visit and uploaded them to our shared WhatsApp case thread the same day — that's our standard channel for case-level case feedback, and it kept the back-and-forth to hours instead of days.

With the side profiles in hand, we re-confirmed the skeletal pattern as Class III and marked three constraints on the design sheet:

The lower ridge mattered more than the lower ridge usually does in a maxillary single-arch case, because in Class III the lower comes forward during function and will push the lower lip against the upper teeth. We flagged this to the dentist so his follow-up on fit expectations after delivery was realistic.

2. Reset the anterior setup

The anterior six were re-arranged for a Class III face, not a Class II one:

• Centrals moved labially so the lip at rest would show 1–2 mm of enamel instead of covering the teeth.
• Incisal plane rechecked against the frontal smile photo. The target was for the incisal edge to follow the lower-lip curve, not sit flat.
• Mild rotational asymmetry on the laterals — natural dentition is almost never a perfectly straight row, and this is one of the ways dentures that look real separate from the ones that read as a store-bought set. In a shade guide the letter marks the colour family and the number marks how light or deep the shade is — but no shade in the world fixes a row of eight teeth lined up like a fence.
• Slight interproximal variation so the lighting on the finished denture wouldn't bounce back as one flat sheet of plastic.

3. Shade, kept the way it was

The shade decision didn't change between try-ins. There's a reason we didn't touch it: the shade is locked in when the denture is processed and can't be shifted after that. Changing shade mid-case means a new set of denture teeth, not an adjustment.

We confirmed the shade under daylight next to the patient's existing upper denture before the second try-in — not just under the lab light. This matters more than people realize, because shade selection has a measurable default. In one prosthodontics department's own records, 28 patients' natural anterior teeth were mostly C-family (39%) and D-family (32%), while 97% of the artificial teeth made for their partial dentures were A-family — a difference that held up on statistical testing (natural versus artificial tooth shade distribution, 28 patients — Bull Tokyo Dent Coll, 2010, PMID 20689236). The shade being chosen and the teeth still in the mouth were disagreeing systematically, not by accident. Age widens the same gap: in 212 adults aged 15–79, tooth shade correlated significantly with age and older adults were more likely to have darker teeth, while skin colour showed no relationship at all (tooth shade against age in 212 adults — J Contemp Dent Pract, 2006, PMID 17091143). That's the argument for a dentist-led shade call checked in daylight against a real mouth — not a shade tab read on a bench.

4. Second wax try-in

The reset anterior went out for a second wax try-in two business days after we received the side profiles. For removable cases, our standard arrangement work (design, wax-up, boxing, injection, polish, QC, packaging) runs on a 2–3 business-day bench cycle; adding or redoing a wax try-in extends the overall case by roughly 1–2 business days, which we quoted to the dentist up front.

Feedback came back positive within a day. The second try-in showed:

• Centrals visible at rest, lips not covering them.
• Smile line following the lower lip at full smile.
• Phonation unchanged against the existing upper denture reference.
• Dentist and patient both signed off on the arrangement.

Only after this sign-off did we process the base.

5. Base and finishing

• Base: heat-polymerized PMMA, our standard for a full upper, with controlled stepped water-bath polymerization to minimize shrinkage and tooth drift as the resin sets.
• Festooning: we carried the labial festoons into the base to break up the flat pink surface, and shaped the interdental papillae to match the arrangement — a flat, glossy base is one of the fastest ways a denture reads as a denture.
• Characterization: light stippling across the attached-gingiva area, slight warm tone through the free margin. The base colour is decided the same way the tooth shade is — by the dentist, matched against the patient's own tissue, not by the patient picking from a swatch. That ordering has clinical support: across 88 edentulous patients, satisfaction with the finished denture correlated with the dentist's initial base-colour selection (P = 0.006) and showed no significant correlation with the patient's own preferred base colour (P > 0.05) (dentist-selected base colour and satisfaction in 88 patients — BMC Oral Health, 2026, PMID 42321790).
• Tinting: internal tinting is the documented route for cases where the base has to carry more character than a single shade allows — a published case report used heat-polymerized monomer mixed with dedicated pigments to rebuild the gingiva-to-alveolar-mucosa transition on a patient with mucosal pigmentation (customized characterization with internal tinting, case report — J Pharm Bioallied Sci, 2025, PMID 41522895). Our tinting here was lighter than that example — this patient had no pigmentation — but the principle holds: colour inside the base, not painted on top of it.
• Polish and QC: multi-step polish, final check against the signed-off design, packaged and shipped.

The final result

The denture went in during a short seating visit. Four things the dentist noted in the handover photos:

• Rest position: 1–2 mm of upper central visible — the number we set as the target when we rebuilt the record.
• Speech: teeth visible across normal conversation, not hidden under the lip.
• Smile line: upper lip resting at the cervical third of the centrals, not on top of them. The row of teeth followed the curve of the lower lip instead of sitting flat.
• Shade match: on the side-by-side with her existing upper (daylight), the new denture read as a continuation of the same mouth, slightly less uniform than a brand-new set would normally be — which was the point. "Dentures that look real" and "dentures that read as a factory product" differ most in the micro-asymmetries, not in the shade.

What this case actually proved

Three things, in order of weight:

1. The wax try-in is where face-type miscalls get caught — and nowhere else. The record on the first round didn't include side profiles. The arrangement was correct against the paperwork, wrong against the face. Without the try-in step, this would have been a finished, polymerized denture that didn't fit her face.
2. Arrangement decides the "natural" read, before shade. We didn't change the shade between the two try-ins. We changed where the anterior six sat relative to her lip. That alone changed the outcome from "weird smile, no teeth visible" to "reads like her own mouth".
3. The record matters as much as the setup. Classification-level decisions (Class II vs Class III) can't be made from a frontal photo and a bite registration. For future cases of this complexity we now ask for three side-profile shots at the start — rest, "E", and full smile — rather than catching the gap at wax try-in.

Where this fits in our removable workflow

A quick note for clinicians evaluating us as a lab partner — not as a sales pitch, as context:

• Removable at Istar runs through our Removable Denture Department (about 55 technicians plus trained backup), with an internal capacity of roughly 4,000 cases a month in normal season and up to 6,500 in peak. We don't outsource cases.
• A wax try-in is a standard option on any removable case, not an upsell. For cases with any uncertainty on arrangement or face type, we recommend it in writing before processing.
• Verification items we check at wax try-in (and expect the dentist to confirm): aesthetics, teeth position and midline, teeth shape, occlusion, VDO, phonation, base stability, and patient-level satisfaction. The items came from this and comparable cases where any single one, missed, meant a reset.
• Standard turnaround is 2–3 business days of bench work for conventional removable cases, excluding dentist-side approval time, missing-data time, weekends, and Chinese public holidays — those are not counted into our committed turnaround. Adding or redoing a wax try-in typically extends the overall case by 1–2 business days, and we tell the dentist up front when we think it will.
• Communication runs through a dedicated WhatsApp group per case with a case coordinator. Side profiles, mid-process photos, and sign-offs happen in that thread, which is why the second try-in on this case moved in hours rather than days.
• Factory visits and video audits are available at our Shenzhen and Huizhou facilities — if a dentist or lab wants to see where a removable case physically moves across benches, that's a direct line.

About the lab behind this case

Istar Dental Lab is a direct manufacturing dental laboratory founded in 2012, with facilities in Shenzhen and Huizhou. We are a full-service lab, not a trading company — the entire production chain for a removable denture (order review, scan or model work, CAD design review, 3D-printed model or stone model, arrangement, wax-up, boxing, injection, polish, multi-stage QC, final QC, packaging, shipping) runs inside our own facilities with our own technicians.

We work with dental clinics, dentists, and dental laboratories across the United States and Europe, and we do removable work at scale: our Removable Denture Department is one of our largest bench teams, with capacity to absorb peak-season volume without outsourcing or dropping cases to third parties.

If you have a case that needs a careful arrangement, a case where face type and old denture history don't quite agree, or a case where a wax try-in is non-negotiable, that is exactly the kind of removable work we're set up for.