What is a contraindication for using a complete ceramic crown?

A complete ceramic crown is often chosen for its aesthetic qualities and ability to seamlessly blend with natural teeth. However, bruxism, which is the involuntary grinding or clenching of teeth, poses a significant contraindication for using a complete ceramic crown due to the high forces exerted on the crown during these activities. Ceramic materials, while strong, can be brittle and susceptible to fracture under excessive stress. Therefore, patients with bruxism are at a higher risk of damaging a ceramic crown, making it a poor choice for these individuals.

In contrast, the other choices present scenarios where ceramic crowns can be effectively used. An intact incisal edge may maintain the structural integrity necessary for supporting a ceramic crown, high esthetic requirements align with the advantages of ceramic materials, and a favorable distribution of occlusal load suggests that the forces on the crown will be manageable, minimizing the risk of damage.