What is the minimum sterilization temperature and time for dry heat ovens?

The minimum sterilization temperature and time for dry heat sterilization requires conditions that effectively eliminate all microorganisms, including spores. The correct answer states that the temperature should be set at 320°F for a duration of 120 minutes. This level of heat and time is sufficient to ensure that all pathogenic organisms are destroyed, which is essential in a dental setting where hygiene and safety are paramount.

Dry heat sterilization operates through the transfer of heat to the instruments through convection, and it is important that the temperatures are high enough to achieve sterilization effectively. In comparison, the other options present temperatures and times that do not meet the established standards for effective sterilization. For instance, a lower temperature or insufficient time may not adequately kill all microorganisms, and therefore, these conditions would not be deemed safe for sterilizing dental instruments.