A gold crown tooth no. 19 failed and was replaced with a Pocelain ceramic substrate crown. .

i was informed after a cleaning that the porcelain crown has a crack. what caused it to crack after 8 months. are the crowns guaranteed. thank you. john

Doctor Answers 3

Dentists run a business

While there is no requirement to warrantee or guarantee anything, basic business principles matter.  If a dentist makes bad business decisions, they won't be in business for very long.  If your request is reasonable, perhaps.

If the crown is BONDED and not cemented, the crack may not matter.  Natural teeth have cracks, called crazed lines, that don't matter much.  The crack may not get any worse, depending on the material and luting process.

Seattle Dentist
4.3 out of 5 stars 6 reviews


Porcelain crowns can fracture for any number of reasons from you grinding your teeth to biting on something that is too hard.  I suggest you talk to your dentist to see what the policy is for recently done crowns that fracture.  There is no nation wide guarantee.  It is up to the dentist to set their own standard.  Good luck!

Thomas Roberts, DDS
Seattle Dentist

Usually Bruxism

It is possible that a porcelain crown was made with an inherent crack that was not noticeable when cemented. However, usually when a crown or tooth breaks, there is some bruxism going on while sleeping. Most people are not even aware that they do this. A perceptive dentist would be able to detect signs of clenching or grinding at night. As far as a guarantee goes, I tell my patients that if anything goes wrong that is not due to lack of proper hygiene, then I guarantee my work for 1 year. It will last much longer than this of course. Bruxism will cause most dentistry to fail eventually and should be diagnosed early.
 Good luck.

John F. Calvert, DDS
Ketchum Dentist
5.0 out of 5 stars 2 reviews

These answers are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.