What type of sterilization uses an average cycle time of 3 minutes?

Flash sterilization is the correct answer because it involves rapidly sterilizing instruments using steam under pressure in an autoclave, typically in a shorter cycle time compared to standard sterilization methods. The average cycle time for flash sterilization is around 3 minutes, making it an efficient option for quickly processing instruments that are needed immediately or when situated in a busy dental practice.

In contrast, autoclaving generally requires a longer cycle time for thorough sterilization, while chemical sterilization utilizes chemical agents that often take longer and require specific conditions to achieve the desired sterile outcome. Cold sterilization, on the other hand, relies on immersion in chemical solutions over an extended period, which is not suited for the quick turnaround needed in certain situations. Thus, the characteristics of flash sterilization align with the requirement of a 3-minute average cycle time.