Which statement about the properties of porcelain is incorrect?

The statement regarding CEREC restorations having greater flexural strength than E-max is incorrect. E-max, which is made of lithium disilicate, is known for its superior strength and esthetics compared to traditional CEREC materials. E-max restorations typically exhibit high flexural strength, making them suitable for various applications in both anterior and posterior regions of the mouth.

CEREC materials, while convenient and effective for same-day restorations, do not generally match the flexural strength of E-max. Understanding the material properties is crucial for making informed decisions in restorative dentistry, especially when considering the longevity and durability of the restorations.

In contrast, the other statements accurately reflect the properties of porcelain. First-generation pressable ceramics indeed have improved strength compared to traditional feldspathic porcelains, enabling more effective and durable restorations. Second-generation pressable ceramics benefit from the reinforcement of lithium disilicate, providing both aesthetic and mechanical advantages. Lastly, the correlation between hardness and wear resistance is recognized, as harder materials typically exhibit improved wear resistance against opposing dentition in clinical settings.