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The All-on-4 prosthesis — the visible bridge of teeth attached to the four implants — is not a single material category. It is fabricated in different materials with genuinely different clinical properties, and the choice between them affects aesthetics, longevity, bite force transmission, and what maintenance is required. Understanding these differences helps patients evaluate their treatment plan and ask the right questions at consultation.
Provisional Acrylic Bridge
In most All-on-4 protocols at Dazzle, the provisional bridge placed on the day of surgery is a reinforced acrylic prosthesis. Acrylic is used at this stage for specific reasons: it is lighter than zirconia, which reduces load on the healing implants during the osseointegration period; it can be adjusted chairside if the bite settles differently during healing; and it provides a reasonable aesthetic result without the fabrication complexity of the final prosthesis.
The provisional is explicitly designed for the healing period. Patients are kept on a soft diet for 6–8 weeks to protect the bone-implant interface, and the acrylic is designed with reduced cusp angles to limit lateral forces. The provisional is not the restoration patients will live with long-term.
Acrylic-on-Titanium Framework (Permanent Acrylic Bridge)
The first category of permanent prosthesis is an acrylic tooth arrangement supported by a milled titanium framework. The titanium provides structural rigidity and prevents bridge fracture; the acrylic teeth provide aesthetics. This is sometimes described as a “hybrid” bridge.
Advantages: lighter weight than monolithic zirconia, easier to repair (acrylic teeth can be replaced without remaking the entire prosthesis), somewhat lower cost than zirconia. Appropriate for patients managing cost, patients with very high bite forces where the acrylic’s compliance reduces stress transmission, and cases where simplicity of repair is a priority.
Limitations: acrylic teeth wear and stain more than ceramic; a colour mismatch between acrylic and any remaining natural teeth may develop over years; the prosthesis typically requires replacement or significant refurbishment at 8–12 years. Not the optimal choice for patients prioritising aesthetic longevity.
Monolithic Zirconia Bridge
Zirconia (zirconium dioxide ceramic) is the premium material for All-on-4 permanent prostheses. Milled from a solid block of zirconia in our in-house digital laboratory, the bridge is a single-piece ceramic restoration of exceptional durability.
Advantages: natural-looking translucency comparable to natural teeth; stain-resistant (coffee, tea, wine do not discolour it over time); flexural strength approximately 1000–1200 MPa, compared to 60–100 MPa for feldspathic porcelain; does not accumulate surface scratches the way acrylic does; realistic lifespan of 15–20 years with appropriate maintenance.
Limitations: higher upfront cost than acrylic-on-titanium; not repairable in segments — if a portion chips or fractures, the affected section typically needs to be remade rather than patched; heavier than acrylic (though modern multi-layer zirconia designs reduce the weight difference significantly). For patients who grind, zirconia wears opposing natural teeth more than acrylic does, which is why bruxists with zirconia bridges should always use nightguards.
Which Material Does Dazzle Recommend?
For patients without significant budget constraints, zirconia is the preferred permanent prosthesis material. The aesthetics are superior, the longevity is greater, and the maintenance burden over 15–20 years is lower despite the higher upfront cost.
For patients managing cost, or where specific bite force or repair considerations favour the hybrid approach, acrylic-on-titanium is a clinically sound option with appropriate expectations for the replacement timeline.
For bruxists, the nightguard is essential regardless of material. For full-arch cases where the patient has confirmed bruxism and prefers zirconia, the material selection is appropriate but the nightguard is non-negotiable from the day of final prosthesis delivery.
Material selection is discussed at consultation with full cost implications and realistic expectations for each option. We do not default to the most expensive material as a standard without discussing the alternatives.
Fabrication in the In-House Laboratory
All permanent All-on-4 prostheses at Dazzle are fabricated in our in-house digital laboratory. The intraoral scan data from the final impression is processed through CAD software to design the bridge, which is then milled from the chosen material. The clinical team and laboratory team are in direct communication throughout the process — when shade adjustments, contour changes, or occlusal refinements are needed, they happen without the delay of an external lab workflow.
FAQs
Q1: Can I choose the material after surgery?
Yes. The permanent prosthesis selection — material, shade, and design — is finalised at the final impression appointment, which occurs after osseointegration is confirmed at 3–6 months. Patients have time between surgery and the final prosthesis appointment to revisit the material discussion. The provisional acrylic bridge provides an opportunity to evaluate the shape and fit before committing to the final material.
Q2: Does zirconia look natural?
Modern multi-layer zirconia can closely replicate the translucency gradient and subtle colour variation of natural teeth. The limitation is not the material itself but the aesthetic zone context — an implant-supported bridge that covers the entire arch involves compromises in gum line anatomy that differ from natural teeth. Your clinician will discuss realistic aesthetic expectations for your specific case.
Q3: How much heavier is a zirconia bridge than acrylic?
A full-arch zirconia bridge is typically 30–50% heavier than a comparable acrylic-on-titanium hybrid. In practice, patients adapt to this weight difference quickly and rarely find it significant after the first few weeks. The weight difference does not affect implant outcomes with modern zirconia designs.
Q4: Can the All-on-4 bridge be whitened?
No. Ceramic (zirconia) and acrylic prosthetic materials do not respond to bleaching agents. The shade is determined at the design stage and does not change. If you are planning teeth whitening, it should be completed before the final prosthesis shade is selected, so the shade can be matched to your natural tooth colour at its brightest.
