Which of the following is not an application of pyrolytic carbon?

Pyrolytic carbon is a material known for its biocompatibility and mechanical properties, making it suitable for various medical applications. One significant application is in heart valves where it is used as a coating for components because it provides excellent durability and resistance to wear and tear. Additionally, it is used in blood-contacting applications due to its favorable blood compatibility, minimizing thrombogenic responses.

In areas requiring a highly smooth finish, pyrolytic carbon can also be beneficial as it can be applied in ways that create very smooth surfaces, which are crucial for reducing friction and improving the performance of medical implants.

However, in the context of dental restorations, pyrolytic carbon is not commonly utilized. Dental materials typically require aesthetic qualities such as translucency and color-matching to the natural teeth, which are not characteristic of pyrolytic carbon. Instead, materials like ceramics and composite resins are preferred for these applications due to their superior aesthetics and compatibility with tooth structure. Thus, the application of pyrolytic carbon in dental restorations is not standard practice, making it the correct answer for this question.