The aseptic technique in the lab uses the dry-heat sterilization method using direct application of high heat, such as sterilizing inoculating loops with the bunsen burner. Incineration at very high temperatures destroys all microbes. Dry heat can also be applied at temperatures up to 170 °C for extended periods of time by using a dry-heat sterilizer, such as an oven. However, moist heat is preferred because it penetrates cells better than dry heat.