What is the maximum amount of unsupported porcelain that is allowed on a dental restoration?

The maximum amount of unsupported porcelain that is allowed on a dental restoration is 2 mm. This standard is rooted in the need to maintain the integrity and strength of the porcelain while minimizing the risk of fracture or debonding. Unsupported porcelain is more susceptible to stress and strain during masticatory forces; therefore, limiting its thickness is crucial for ensuring durability and functionality.

Allowing more than 2 mm of unsupported porcelain diminishes structural reliability and can lead to potential failures in the restoration. Additionally, proper bonding techniques and the base material help distribute forces more effectively, providing added stability to the restoration. This specification aligns with industry standards and best practices in dental materials, focusing on optimal performance and longevity of dental restorations.