Sterilization by Hot-air Ovens
These are thermostatically controlled ovens, with an electric heating element, similar to a domestic electric oven.
• Instruments to be sterilized are heated to 160 degree C (320 degree F) for 1 hour
• Sterilization is achieved, but it is not suitable for rubber or plastic instruments
• In hospital has been used for sterilizing powders and petroleum products and sharp delicate instruments.
The efficiency of dry heat sterilization depends on the initial moisture of the microbial cells, but all microorganisms are killed at 160°C for a hold time of not less than 2 hours.
The main advantages of dry heat sterilization are its ability to treat solids, nonaqueous liquids, grease/ointments and to process closed (airtight) containers. Lack of corrosion is important in the sterilization of nonstainless metals and surgical instruments with fine cutting edges
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