Among the proposed theories of porcelain-to-metal attachment, which mechanism is considered most significant?

Chemical bonding is considered the most significant mechanism in the porcelain-to-metal attachment process. This bond forms at the molecular level where specific chemical interactions occur between the metal surface and the porcelain material. These interactions involve the formation of a durable and stable connection that can withstand the forces of chewing and function over time.

The role of chemical bonding is crucial because it directly influences the longevity and strength of the dental restoration. A strong chemical bond enhances the resistance of porcelain to chipping and delamination, which are common failure modes in dental restorations.

Other mechanisms, while important in their own right, do not demonstrate the same level of significant impact as chemical bonding. Mechanical interlocking, for instance, relies on the physical form and texture of the metal surface to create a retention mechanism, but this alone does not provide the same enduring strength as a chemical bond. Similarly, Van Der Waals forces are relatively weak compared to the robust interactions present in chemical bonding, making them less significant in achieving a successful porcelain-to-metal interface. Compression bonding is also important; it pertains more to how materials fit together rather than a primary mechanism of attachment.

In summary, the chemical bond provides the most effective and lasting attachment between porcelain and metal due to its inherent strength and stability,