How Long Can Cobalt-Chromium Porcelain Dental Crowns Last? Are There Any Hazards Associated with Them?

The specific lifespan of cobalt-chromium porcelain veneers cannot be determined, as it is influenced by various factors. Generally, the expected lifespan is 10 years, with a maximum of approximately 40 years. The harm associated with cobalt-chromium porcelain veneers includes its impact on human appearance, potential harm to the gums, and interference with magnetic resonance imaging (MRI) examinations.

Cobalt-chromium porcelain veneers are effective for various types of pigmented and malformed teeth, helping to restore their neat and white appearance. Due to their excellent biocompatibility, these veneers do not cause dark lines on the gums or lead to allergic reactions or rejection. They are currently considered an ideal choice for dental restoration. The typical lifespan is 10 years, with a maximum of approximately 40 years, depending on various factors. Therefore, it is crucial to maintain proper care of cobalt-chromium porcelain veneers.

Unhealthy dental habits, such as chewing on hard objects, poor brushing habits, and smoking, can affect the lifespan of cobalt-chromium porcelain veneers if not corrected after installation. Therefore, developing good oral hygiene habits is essential, including avoiding biting hard objects, rinsing after meals, and brushing teeth regularly, which can extend the lifespan of cobalt-chromium porcelain veneers.

Firstly, the color of cobalt-chromium porcelain veneers can be unnaturally white due to the dark color of the metal layer within the cobalt-chromium alloy. If the external ceramic material is too transparent, it may not be able to conceal the internal color, resulting in an unnatural appearance compared to natural teeth.

Secondly, after prolonged use, the cobalt-chromium alloy within the porcelain veneers may oxidize, leading to a darkening of the contact areas with the gums. This can cause issues such as gum inflammation and bleeding.

Lastly, cobalt-chromium porcelain veneers can interfere with MRI examinations. The metal components can affect the magnetic field, resulting in artifacts that may interfere with the accuracy of the results. However, the extent of the interference depends on the specific area being imaged. While there is minimal impact on areas distant from the teeth, MRI examinations of the brain, especially those involving the upper jaw, may be significantly affected.

It's worth noting that porcelain veneers with precious metal linings tend to produce weaker artifacts during MRI exams.