Dental Crowns and Bridges at Dazzle Dental Clinic: Materials, Indications, and the Digital Fabrication Process

Dental crowns and bridges are the most common restorations in dentistry, but the choice of material — zirconia, IPS e.max, porcelain-fused-to-metal (PFM), or full-cast metal — significantly affects the outcome. At Dazzle Dental Clinic, all crowns and bridges are designed digitally from an intraoral scan and fabricated in the in-house laboratory, which means the material selection, fit accuracy, and aesthetic characterisation are under direct clinical control at every stage.

Crown Materials: What Each Does and When Each Is Used

Zirconia: The current standard for posterior permanent crowns at Dazzle. Zirconia (zirconium dioxide) achieves flexural strength of 1000–1200 MPa — significantly stronger than any other crown ceramic. It is biocompatible (no metal, no nickel or chromium sensitivity), can be milled by CAD/CAM in the in-house laboratory, and is available in multilayer “gradient” configurations (translucent zirconia over a more opaque base layer) that produce aesthetics equivalent to E.max for posterior teeth. The primary limitation: full-contour monolithic zirconia has less optical depth than layered feldspathic ceramic, which is why it is the preferred choice for posterior teeth where strength matters more than the subtle translucency visible in anterior teeth in direct lighting.

IPS E.max (lithium disilicate): The preferred material for anterior crowns and veneers where maximum aesthetics are required. E.max is pressed or milled, achieves 400 MPa flexural strength (less than zirconia but adequate for most anterior crown cases), and produces excellent optical properties — translucency, shade matching, and surface texture that closely mimics natural enamel. E.max is appropriate for anterior single-unit crowns, implant crowns in the aesthetic zone, and multi-unit anterior bridges in normal occlusal load cases.

Porcelain-Fused-to-Metal (PFM): A metal coping with porcelain baked over it. PFM crowns were the dominant restoration for decades and remain structurally strong. Their primary limitations: the metal coping produces a dark line at the gum margin when gum recession occurs over years; the porcelain layer can fracture (chip) from the metal coping under load; and the aesthetics of porcelain over a metal substrate are inferior to all-ceramic options. PFM remains appropriate where cost is a primary constraint and where the aesthetic zone is not involved.

Full-cast metal: High-gold or base-metal alloy crowns with no ceramic component. The strongest restoration option; never fractures under occlusal load. Used where maximum durability is needed and aesthetics are not a concern — typically non-visible molar areas in patients with heavy bite forces or bruxism.

Bridge Types: What the Options Mean

Traditional fixed bridge: A false tooth (pontic) held between two crowns cemented to the adjacent teeth. The adjacent teeth must be prepared (reduced) to accommodate the crowns — this is an irreversible alteration to otherwise sound teeth. Traditional bridges are durable (10–15 year survival) but require sacrificing adjacent tooth structure that an implant-supported replacement would preserve.

Implant-supported bridge: Supported by implants rather than prepared natural teeth — the preferred option where the adjacent teeth are sound, since no natural tooth structure is sacrificed. More expensive upfront; avoids the long-term consequence of two adjacent teeth permanently crowned and at risk of endodontic complications.

Maryland (resin-bonded) bridge: Metal or ceramic wings bonded to the inner surfaces of adjacent teeth support a pontic without full crown preparation. Minimal preparation; reversible. Limited to anterior sites with low bite forces; survival is lower than conventional bridges (5–10 years before debonding is likely).

The Digital Workflow at Dazzle

Every crown and bridge at Dazzle begins with an intraoral scan of the prepared teeth — no physical impression. The digital model is used in CAD software to design the restoration, which is reviewed for occlusal contacts, emergence profile, and shade before milling begins. The restoration is milled from the appropriate ceramic block in the in-house Amann Girrbach milling unit, sintered and characterised in the Ivoclar Programat furnace, and tried in before any adhesive is placed. If the fit or shade requires adjustment, it is corrected before the permanent cement is mixed.

FAQs

Q1: How long do zirconia crowns last?
Published zirconia crown survival: 90–95% at 10 years across multiple independent studies. The dominant failure mode is fracture of the veneering porcelain layer in layered zirconia crowns — less relevant for monolithic (solid) zirconia crowns, which have superior fracture resistance. With good oral hygiene and regular maintenance, monolithic zirconia crowns commonly reach 15–20 years.

Q2: Is a crown always needed after a root canal?
For posterior teeth (molars, premolars): yes, almost always. Root-treated posterior teeth are more brittle (loss of moisture from the pulp chamber) and subjected to high occlusal forces; without crown coverage they fracture. For anterior teeth: the decision depends on how much natural tooth structure remains after access cavity preparation. A well-restored anterior root canal tooth with adequate remaining tooth structure can sometimes be managed without a crown.

Q3: Can a crown be placed the same day at Dazzle?
For single-unit posterior zirconia crowns where shade matching is straightforward: same-day delivery is achievable. The preparation, scan, milling (20–60 minutes), sintering (2 hours), and cementation occur within a single extended appointment. For anterior crowns requiring precise shade characterisation: the characterisation appointment is typically the following morning.

Q4: How do I decide between a bridge and an implant for a missing tooth?
If the adjacent teeth are sound and unrestored: an implant is strongly preferred. It replaces the missing tooth without permanently altering the adjacent teeth and maintains bone at the extraction site. If the adjacent teeth already have large restorations or crowns: a bridge is a more defensible choice since the adjacent teeth are already committed to crown coverage. The CBCT assessment at Dazzle evaluates bone volume to confirm implant candidacy before a recommendation is made. See our detailed dental bridges guide for the full comparison.