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Can Crowns Expire?

Published in Dental Crown Lifespan 4 mins read

No, dental crowns do not expire like perishable goods, but they do have a finite lifespan and may eventually need replacement as they can wear out or become damaged over time.

Understanding Crown Longevity

While a dental crown doesn't have an "expiration date" in the traditional sense, its functional lifespan varies significantly. Some crowns are able to last a lifetime whereas others may crack and need to be replaced. The durability of a crown depends on various factors, including the material it's made from, the patient's oral hygiene, and their bite habits. On average, a crown can last between 10 and 30 years when well cared for.

Crowns may need replacement due to:

  • Wear and Tear: Years of biting and chewing can cause the crown material to thin or develop microscopic cracks.
  • Damage: Trauma, grinding, or chewing hard objects can lead to chips or fractures.
  • Decay: New decay can form at the margin where the crown meets the tooth, compromising its seal.
  • Gum Recession: As gums recede, the crown margin may become exposed, leading to an aesthetic issue or increased sensitivity.
  • Loosening: The cement holding the crown in place can degrade, causing the crown to become loose or fall off.

Factors Influencing a Crown's Lifespan

Several key factors determine how long a dental crown will remain effective and intact:

  • Crown Material: Different materials offer varying levels of durability and aesthetic appeal.
    • Porcelain: Excellent aesthetics but can be more prone to chipping.
    • Metal (Gold alloys, base metals): Very strong and durable, ideal for back teeth, but not aesthetically pleasing for front teeth.
    • Porcelain Fused to Metal (PFM): Combines strength of metal with aesthetics of porcelain, but can show a dark line at the gum line over time.
    • Zirconia/E.max: Modern materials offering a good balance of strength and aesthetics.
  • Oral Hygiene: Consistent and thorough brushing and flossing are crucial to prevent decay around the crown and maintain gum health.
  • Bite Forces and Habits:
    • Bruxism (Teeth Grinding/Clenching): Applies excessive pressure, leading to accelerated wear or cracks.
    • Diet: Chewing on ice, hard candies, or using teeth to open packages can damage crowns.
  • Location in the Mouth: Crowns on back teeth (molars) endure more chewing force than those on front teeth.
  • Quality of Fabrication and Bonding: A well-made crown, properly fitted and bonded by a skilled dentist, will naturally last longer.
  • Regular Dental Check-ups: Routine visits allow your dentist to monitor the crown's condition and address any issues early.

Signs a Crown May Need Replacement

Be aware of these indicators that your crown might be failing or nearing the end of its lifespan:

  • Visible Cracks or Chips: Any physical damage to the crown.
  • Pain or Sensitivity: Especially when biting or consuming hot/cold foods, which could indicate decay underneath or an issue with the crown.
  • Loose Crown: The crown feels wobbly or comes off when flossing or eating.
  • Dark Line at the Gum Line: Common with older PFM crowns where the metal base becomes visible as gums recede.
  • Gum Inflammation or Bleeding Around the Crown: Could indicate an ill-fitting crown or plaque accumulation.
  • Changes in Bite: If your bite feels off or uncomfortable.

Extending the Life of Your Dental Crown

You can significantly prolong the life of your crown with proper care:

  • Maintain Excellent Oral Hygiene: Brush twice daily and floss daily, paying special attention to the area around the crown.
  • Avoid Hard or Sticky Foods: Steer clear of ice, hard candies, nuts, and very sticky caramels that can chip or dislodge the crown.
  • Address Bruxism: If you grind or clench your teeth, especially at night, consider wearing a custom-fitted nightguard to protect your crown and natural teeth.
  • Regular Dental Check-ups: Visit your dentist for routine examinations and cleanings. This allows them to spot potential issues with your crown early and address them before they become major problems.