What is a major cause of jacket crown breakage?

The major cause of jacket crown breakage being attributed to porcelain being thinner than 1mm is based on the mechanical properties of materials used in dental restorations. When porcelain is less than 1mm thick, it lacks the necessary structural integrity to withstand normal biting and chewing forces. Thinner porcelain layers are more prone to fractures and breakage due to stress concentration, which can occur during functional loads placed on the crown.

In dental practice, a minimum thickness of porcelain is typically recommended to ensure that it can resist cracking and breaking. Thicker porcelain not only provides greater strength but also improves aesthetics and reduces the chance for voids, which can weaken the restoration. This understanding is crucial for dental professionals in fabricating durable restorations that will withstand the rigors of daily use.

While other factors such as inclusion of materials like platinum foil, the type of cement used, and the presence of voids can influence the overall longevity and performance of a crown, they are not as significant a direct cause of breakage as insufficient porcelain thickness. Ensuring proper thickness is fundamental in avoiding catastrophic failure of the crown.