Dental · Dental Crowns
Gold & Metal Crowns: The Most Conservative Crown for Back Teeth
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Key facts - A full metal crown is a cast restoration made entirely from gold alloy or cobalt-chromium, with no ceramic. - In one long-term study of 1,314 cast gold restorations, 95.4% were still in service, many after 25–52 years. - Gold crowns cost roughly £400–£900 in Turkey and cobalt-chromium £80–£180; one 5–7 day trip is usually enough.
Why Metal Crowns Still Matter
Metal crowns have almost disappeared from cosmetic dental marketing, and most patients assume they are obsolete. The evidence says otherwise. In a retrospective evaluation of 1,314 cast gold restorations placed by one practitioner, 95.4% were still in service; 72% had been in place for over 20 years, and 45% for 25–52 years.1
A cast gold crown cannot chip, crack or delaminate. It wears at roughly the same rate as natural enamel, can be made in thin sections without fracturing, and its margins can be adapted to the tooth more precisely than almost any ceramic.
Its disadvantage is aesthetic. It is visibly gold or silver, which usually rules it out for teeth that show when you smile. For second molars, and often first molars in patients with a modest smile line, appearance matters far less than function. Metal crowns are particularly well suited to:
- a tight bite with little space between the jaws;
- heavy grinders and clenchers;
- short clinical crowns, where every fraction of a millimetre of retention matters;
- protecting an opposing natural tooth from wear.
Cosmetic dentistry tends to present ceramics as the only modern option. For posterior molars in these situations, a well-made gold crown is often the most conservative, most durable and ultimately cheapest restoration over a lifetime.
Conservative Preparation and Wear
Metal is strong in thin sections, so a cast gold crown needs only about:
- 1.0–1.5 mm of occlusal reduction (1.5 mm on the load-bearing cusps, 1.0 mm on the others);
- 0.5–0.7 mm of axial reduction.
A layered PFM crown needs 1.5–2.0 mm, and lithium disilicate around 1.5 mm or more. Monolithic zirconia is closer to gold, but still needs adequate bulk to resist fracture.
The difference matters most at the margin. Metal allows a conservative 0.5–0.7 mm knife-edge or light chamfer margin, finishing in a fine edge with minimal loss of tooth at the neck. On short, tapered molars, preserving that cervical tooth keeps both retention and the ferrule, the collar of sound tooth the crown grips. That can decide whether a tooth is restorable without surgical crown lengthening or root canal treatment.
Ductility is gold's other clinical advantage. High-gold alloys deform before they fail, so a dentist can burnish a gold margin, gently rubbing it against the tooth to close the marginal gap. A ceramic margin cannot be adjusted this way, and tight margins reduce cement washout, leakage and recurrent decay.
Wear compatibility is equally important. Gold is close to enamel in hardness and wears at a similar rate, so crown and opposing tooth wear together, gradually and evenly. Cobalt-chromium is harder than gold but still acceptable when highly polished.
Metal crowns are cemented conventionally with zinc phosphate, glass ionomer or resin-modified glass ionomer cement, so no rubber dam isolation is required.
Gold, Cobalt-Chromium and the Casting Process
Cast gold alloys are classified by composition and hardness. High-noble alloys contain at least 60% noble metals, with at least 40% gold; many crown alloys contain around 70–85% gold, with platinum, palladium, silver and copper. Type III and IV casting golds balance hardness, strength and ductility. They are extremely corrosion-resistant, and gold allergy is rarely clinically relevant.2
Non-precious cobalt-chromium (Co-Cr) alloys are nickel-free, strong and inexpensive. Co-Cr is harder and less ductile, so its margins cannot be burnished and fit depends entirely on laboratory accuracy. Nickel-chromium is cheaper still but best avoided, because nickel allergy is common.2
The traditional lost-wax process works as follows:
- The technician waxes the crown on a model of the prepared tooth.
- The wax pattern is invested in a heat-resistant mould and burned out.
- Molten alloy is cast into the space, using centrifugal or induction casting.
- The casting is divested, fitted to the die and polished to a high lustre.
Digital workflows design the crown in CAD software and print or mill the wax pattern; Co-Cr crowns can also be milled or laser-sintered directly. A high polish is not cosmetic: it resists plaque, avoids wearing the opposing tooth and prevents corrosion, and every adjusted area must be polished again.
A One-Week Treatment Plan
Day 1: diagnosis. Radiographs, a bite analysis and a wear assessment confirm the molar needs a crown and show how much space is available. The alloy is agreed in writing: high-noble gold with its percentage stated, or Co-Cr.
Day 2: preparation. Under local anaesthetic, the tooth is prepared with 1.0–1.5 mm occlusal reduction and a 0.5–0.7 mm margin. A scan or impression is taken and a temporary crown fitted.
Days 3–4: laboratory work. The crown is waxed or designed, cast or milled, fitted to the die and polished.
Days 5–6: fitting. Margins are checked with an explorer and radiographs, and gold margins burnished if needed. Contacts and bite are checked, the crown is cemented, and adjusted areas are re-polished.
Day 7: review. Bite comfort and gum health are checked, and a night guard is made where grinding is present.
Avoiding Material Upsells and Substitutions
The first trap is the opposite of most dental marketing: ceramics pushed on high-wear molars. In a tight bite, a ceramic crown may need extra tooth reduction, surgical crown lengthening, or both, or be made dangerously thin. If you have heavy wear, short molars or limited space, ask why a conservative gold or Co-Cr crown is not being offered. For severe generalised wear, the problem may need full mouth reconstruction planning rather than individual crowns.
The second is unspecified gold content. "Gold crown" can mean a high-gold alloy, a low-gold alloy or even a gold-coloured base metal. Gold is priced by weight and alloy, so costs move with the metal market. In Turkey, expect roughly £400–£900 per gold crown; the same treatment typically costs £800–£1,500 or more in the UK. Ask for the alloy name, its gold percentage and the laboratory's alloy certificate.
The third is nickel substituted for cobalt. A cheap "metal crown" may be nickel-chromium. Ask for nickel-free Co-Cr in writing; Co-Cr crowns typically cost £80–£180 in Turkey.
Is It Right for You?
| Good fit | Think twice |
|---|---|
| Second molars, and first molars not visible when smiling, particularly with limited space or short clinical crowns | Teeth visible in the smile, and patients unwilling to accept a metal appearance |
| Heavy grinders and clenchers, and teeth opposing natural enamel that needs protecting | Nickel allergy (when nickel-containing alloys are used), and the rare patient sensitive to cobalt or chromium |
| Patients who value longevity and conservation of tooth structure over appearance | Possible issues include temporary temperature sensitivity, recurrent decay at poorly sealed margins, and X-rays that cannot see through metal to reveal decay underneath |
Metal vs Zirconia Crowns
Zirconia crowns are tooth-coloured, strong and metal-free, and polished monolithic zirconia causes little wear on opposing teeth. For many molars, it is a good compromise between appearance and durability.
Cast gold still needs slightly less reduction, especially at the margin, can be burnished for a tighter seal, wears at the same rate as enamel, and has decades more clinical evidence. For tight bites, severe wear and heavy grinders where appearance is not a priority, gold remains the gold standard. Compared with PFM or e-max, it is also the option least likely to chip.
Frequently Asked Questions
Is a gold crown worth the cost given current gold prices?
Over a lifetime, often yes. A gold crown usually costs more upfront than a ceramic crown, and its price moves with the gold market. Long-term studies, however, show cast gold restorations commonly lasting 25 years or more without chipping or fracturing.1 A ceramic crown lasting 10–15 years may need replacing two or three times over the same period, and each replacement removes more tooth. For a molar in a tight bite or a heavy grinder, the conservative preparation and longevity of gold usually make it the most cost-effective choice. For a lightly loaded molar, zirconia is a reasonable alternative.
Will a metal crown damage my opposing teeth?
Gold is one of the kindest restorative materials to opposing enamel. Its hardness is close to that of enamel, so it wears gradually and evenly alongside the opposing tooth. Cobalt-chromium is harder but causes little wear when highly polished. The main risk with any crown, metal or ceramic, is a rough surface left after adjusting the bite, which is why every adjusted area must be polished before you leave. Compared with rough or glazed ceramics, a polished gold crown is generally the safest option for the tooth it bites against.
Can my dentist still check for decay under a metal crown?
Partly. X-rays cannot pass through metal, so decay under the body of the crown will not show. Decay at the margins, where recurrent decay usually starts, can still be detected with a probe, by visual examination and on bitewing radiographs of the margin area. Well-fitted, burnished gold margins sit tightly against the tooth, which reduces the risk of recurrent decay in the first place. Regular check-ups and careful cleaning at the gum line are the most important protection. The same limitation applies to highly radiopaque zirconia crowns.
Will a metal crown affect MRI scans?
Gold and cobalt-chromium crowns are considered safe during MRI because they are not significantly ferromagnetic. They can cause some local image distortion near the jaw, which matters mainly for head and neck imaging, so tell the radiographer about them before the scan. Gold allergy is rarely clinically relevant, and most patients tolerate cobalt-chromium well. If you have a history of metal allergy, see our guide to porcelain crowns, which explains which alloys to avoid and how to confirm the material in writing.
References
- Donovan T, Simonsen RJ, Guertin G, Tucker RV. Retrospective clinical evaluation of 1,314 cast gold restorations in service from 1 to 52 years. J Esthet Restor Dent. 2004;16(3):194–204. PubMed
- Thyssen JP, Menné T. Metal allergy—a review on exposures, penetration, genetics, prevalence, and clinical implications. Chem Res Toxicol. 2010;23(2):309–318. PubMed