What factor primarily contributes to the risk of porcelain fractures?

Unsupported porcelain is the primary factor contributing to the risk of porcelain fractures. In dental applications, such as in crowns or bridges, porcelain is used for its aesthetic qualities and strength. However, when porcelain is not adequately supported by underlying structures, it becomes more susceptible to fractures. This lack of support can occur in various situations, such as with insufficient tooth structure or improper design of the restoration.

The mechanical properties of porcelain mean that it can withstand compressive forces well, but it is less capable of handling tensile stresses. Unsupported areas are vulnerable to cracks and fractures, particularly under conditions like biting forces or thermal changes. Proper design and support ensure the longevity and durability of porcelain restorations, minimizing the risk of failure.

Other factors, while they can impact clinical outcomes, don't contribute as directly to porcelain fractures. For example, inadequate patient education may lead to poor oral hygiene or dietary choices that could eventually affect restorations but do not directly cause fractures. Low-quality dental materials can be a concern, but the focus here is on the support structure rather than the material itself. High moisture exposure may affect the bonding properties of certain materials but is less directly related to the mechanical risk associated with unsupported porcelain. Thus, ensuring proper support for porcelain restorations remains key to preventing fractures