When a Crown Is Needed

A dental crown caps a tooth that has lost too much of its own structure to be rebuilt with a filling, restoring its shape, strength and bite surface. The usual indications are a large filling that has failed or is too big to be replaced with another filling, a tooth cracked or fractured beyond what a filling can hold together, a tooth heavily worn down, or a tooth that has had root canal treatment and needs protection against fracture, since a root-treated tooth is more brittle than one with a healthy nerve and typically needs a crown to protect it afterwards. A crown is also used for cosmetic reshaping in some cases, though that decision is made alongside the structural one, not instead of it.

Not every damaged tooth needs a crown straight away. Severe pain, swelling, bleeding that will not stop, or a fracture that exposes the nerve is assessed as urgent before any restoration decision is made; the choice between a filling, a crown or another option comes after the acute problem is under control.

The underlying question a dentist is answering when recommending a crown is whether the tooth has enough of its own healthy structure left to support a smaller repair, or whether the walls of the tooth are so thin or compromised that only a restoration covering the whole tooth will hold it together under normal biting force. That assessment is made from a clinical examination and, often, an X-ray, not from how the tooth looks on the surface, since a tooth can look intact while still having lost significant structure internally, particularly after a large filling or a root canal.

A crown is also the final restoration in dental implant treatment, attached to the implant post once it has integrated with the jawbone (ADA item 672, distinct from a crown on a natural tooth). The material choice and fitting principles below apply to both, though an implant crown is checked against the implant's own fit rather than a prepared natural tooth.

Crown Materials Compared (Zirconia, PFM, Lithium Disilicate / e.max)

The Australian Dental Association's Schedule itemises crowns by material, running from item 613 (full crown, ceramic) up to item 618 (full crown, metallic), which reflects how different the material options actually are.

Material Strength Appearance Typical use
Zirconia Very high Can look slightly opaque compared with natural enamel, though modern layered zirconia improves this Back teeth taking heavy bite force; increasingly used at the front too
Porcelain-fused-to-metal (PFM) High, with a metal substructure for support Good shade match; a thin dark line can show at the gum margin over time A long-established, well-proven option for both front and back teeth
Lithium disilicate (e.max) High, though generally not matched to zirconia for back-tooth bite force Very good translucency, close to natural enamel Front teeth and premolars where appearance matters most
Full metallic (gold or alloy) Very high, and kind to the opposing tooth Visible metal colour Back teeth where appearance is not a priority, and long-term durability is

The dentist recommends a material based on which tooth is being crowned, the bite forces at that position, and the patient's own priorities between strength and appearance. No single material is correct for every case. A back tooth that does most of the chewing work is typically weighted toward strength, while a front tooth visible when smiling is typically weighted toward how closely the material matches the surrounding natural teeth, and the two priorities are balanced together rather than one automatically overriding the other.

Colour matching is also part of the material conversation. A dentist takes a shade reading against the surrounding teeth before the crown is made, and the laboratory builds the crown to that shade, which is one reason a temporary crown often looks noticeably different from the final one: the temporary is a functional placeholder, not a shade-matched restoration.

Fitting Process and Appointments

A crown is fitted over more than one appointment. The general sequence is preparation and an impression or digital scan of the tooth, a temporary crown worn while a dental laboratory makes the permanent one, and a final appointment for cementation and a bite check.

How many visits this takes, and how long the laboratory turnaround is, depends on the material chosen and the clinic's own process, including whether the practice has in-house milling equipment for a same-day crown or sends the case to an external laboratory. Ask the treating dentist what their own process looks like and how long the wait between the temporary and the permanent crown is expected to be for that specific case, rather than assuming a fixed number of visits applies everywhere.

The temporary crown fitted between appointments is not just a cosmetic placeholder: it protects the prepared tooth, which has less of its outer structure than before preparation, from sensitivity, bacteria and further damage while the permanent crown is made. Treat a temporary crown as a real part of the treatment, not something to ignore if it feels slightly different when chewing, and contact the clinic if a temporary crown comes off rather than waiting for the next scheduled appointment.

Cost and Longevity

There is no official schedule of private dental fees in Australia, so no statewide crown price exists; every practice sets its own fee after examining the tooth. What is fixed is the item structure: a crown is itemised under 613 to 618 depending on the material, and a root-treated tooth being crowned may also carry the root canal items (415, 417) separately on the same treatment plan.

Payer What it covers for a crown
Medicare Not most adult dental services; the CDBS (children 0-17) covers basic services only, not crowns
Oral Health Services Tasmania Eligible concession-card adults pay $47 per appointment, capped at $188 for a course of general care; high-cost treatment can attract an additional co-payment
Health fund extras A benefit toward major dental, subject to the policy's own annual limit and waiting period (commonly around 12 months for major dental)
Patient The remaining balance, or the full fee with no fund cover

OHST also offers several ways to pay an invoice, including phone (1300 011 013), BPAY, Centrepay deductions, Service Tasmania Billpay, in person, and payment plans arranged separately on 1300 565 301 (Tasmanian Department of Health).

How long a crown lasts depends on the material, how hard the patient bites and grinds, and how well the margin where the crown meets the tooth is kept clean, but this page does not publish a year-range survival figure, since no named study in the evidence base supports one specifically for the materials and settings used in Tasmania. Treat any "crowns last X years" claim elsewhere without a named source the same way.

What is more useful than a single lifespan number is understanding what shortens a crown's working life in practice: heavy grinding, plaque accumulating at the margin where the crown meets the natural tooth, and a problem developing in the tooth or root underneath the crown itself. None of those are unique to any one material; they apply to titanium-supported PFM crowns and all-ceramic crowns alike, which is part of why the fitting appointment and the aftercare conversation matter as much as the material choice. The full detail on caring for a fitted crown covers this in depth.

Crown vs Filling vs Veneer

A filling is enough when the remaining tooth structure is sound and only a portion needs rebuilding; once the damage or the size of the existing filling passes a point the tooth can no longer support on its own, a crown becomes the more durable option because it caps and protects the whole tooth rather than patching part of it. A veneer sits in between for front teeth: it covers the visible front surface of a tooth that is structurally sound but discoloured, chipped or misshapen, and it removes far less tooth structure than a crown does.

Filling Veneer Crown
What it covers The damaged portion only The visible front surface The whole visible crown of the tooth
Typical use Sound tooth, localised decay or damage Intact but discoloured or chipped front tooth Heavily broken down, cracked or root-treated tooth
Tooth structure removed Least Small amount from the front surface All around the tooth

The overlap patients often ask about is a large filling versus a crown for the same tooth: once a filling would need to replace so much of the tooth that little natural structure remains to hold it in place, a crown is the more durable and predictable option, even though a large filling might technically still be possible. That threshold is a judgement call the dentist makes from the extent of the damage visible on examination and imaging, not a fixed percentage of the tooth. A bridge is a related but different decision again, since it applies only when a tooth is missing altogether rather than damaged; crown vs veneer vs bridge covers that comparison in full, including what happens to the teeth either side of a bridge.

For a full comparison including bridges, and cost and longevity detail specific to each restoration, see crown vs veneer vs bridge. For what happens if a fitted crown comes loose or needs replacing later, see crown aftercare and lifespan.