Dry heat sterilization works by damaging and destroying microbial proteins and cells through oxidation. There are three main dry heat sterilization methods: flaming, incineration, and hot air ovens. Hot air ovens are commonly used to sterilize heat-resistant materials like glassware. They work through conduction, maintaining temperatures of 150-170°C for 30-150 minutes depending on the volume. Biological spore tests and physical controls like temperature displays ensure proper sterilization. While effective, dry heat takes more time than other methods due to slow heat penetration.