What is the required temperature and time for steam sterilization using gravity displacement?

The correct answer regarding the required temperature and time for steam sterilization using gravity displacement is that the process requires 250°F for 15-30 minutes.

Steam sterilization, specifically gravity displacement sterilization, relies on steam to kill microorganisms, including spores. At 250°F, the effectiveness of the sterilization process is achieved at the described time frame, allowing sufficient exposure to the steam to ensure that all surfaces of the instruments reach the necessary temperature and time for effective sterilization. This method is commonly used in healthcare and dental settings for the sterilization of heat-resistant instruments.

The other options do not accurately reflect the standard parameters for gravity displacement sterilization. Higher temperatures, such as those indicated in the second option, may be used in other sterilization methods like prevacuum sterilization, which operates differently. The longer time suggested in one option is also not required for this specific method, and the last option suggests a temperature and timeframe that do not align with accepted guidelines for gravity displacement sterilization, as it is not standard practice to operate at 270°F for 20 minutes within this specific context.