Crowns made years ago often have a metal base under porcelain. They can be strong and long lasting, but over time a dark grey line may appear at the gumline, especially if the gums recede. If an old crown is affecting your smile or showing signs of wear, modern metal-free crowns offer a more natural alternative.
Porcelain-fused-to-metal crowns have a metal layer under the porcelain. If the gum recedes, the metal edge or the root beneath can become visible as a grey line. The metal can also make the crown look less translucent than natural teeth.
Replacement may be advised if the crown is chipped, the margin is leaking, there is decay underneath, the gum is inflamed, or the appearance bothers you. Your dentist will take X-rays and examine the crown before recommending replacement.
All-ceramic crowns, including zirconia and lithium disilicate, are strong and tooth-coloured throughout. They reflect light more like natural teeth, which is especially important for front teeth.
If you are replacing several crowns, consider whitening your natural teeth first so the new crowns can be matched to your brighter shade. Digital smile design can help plan shape and colour.
The old crown is removed, the tooth is checked and any decay treated, and a new crown is prepared, often with a temporary in between. The final crown is bonded once the shade and fit are confirmed.
Old crowns can sometimes irritate the gum, especially if the edge is rough, overhanging or no longer sealed. This can lead to inflammation, bleeding and gum recession. Plaque can collect at the crown margin, increasing the risk of decay beneath the crown. If you notice bleeding, bad taste or tenderness around a crown, have it checked. Replacing a poorly fitting crown with a well-sealed, smooth restoration often improves gum health significantly. Your dentist may recommend a professional cleaning and improved home care around crowns to keep the gum healthy before and after replacement.
For front teeth, appearance is usually the main reason for replacing old metal-based crowns. All-ceramic crowns offer superior translucency and can be matched closely to natural teeth. For back teeth, strength and fit are often more important than appearance, and well-functioning metal-based crowns may not need replacing. Modern zirconia crowns are strong enough for back teeth and are tooth-coloured, making them a popular option when replacement is needed. Your dentist will assess each crown individually, considering its condition, location and your goals, before recommending whether replacement is necessary or purely optional.
If several old crowns need replacing, you do not have to replace them all at once. Your dentist can prioritise crowns with problems such as decay or leaking margins, and plan cosmetic replacements over time to suit your budget. If you are planning major cosmetic work, it may be better to replace visible crowns together to achieve consistent colour and shape. Discussing a long-term plan helps you understand the costs and benefits and make informed decisions. Keeping records and photographs of your current crowns can also help track changes and plan future treatment.
It is often the metal edge of an older crown or the root showing through due to gum recession.
Not necessarily. If it is healthy and functional, replacement is a cosmetic choice. Your dentist will advise.
Modern ceramic crowns such as zirconia are very strong and suitable for many teeth.
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