Which sterilization process cannot utilize cotton gauze?

• A. Steam sterilization
• B. Dry heat sterilization
• C. Ethylene oxide gas sterilization
• D. Low temperature gas plasma

Answer: (D)

The sterilization process that cannot utilize cotton gauze is low-temperature gas plasma sterilization. This method uses hydrogen peroxide vapor and requires specific materials that can withstand the unique conditions within the chamber. Cotton gauze is absorbent and can retain moisture, which is not suitable for low-temperature gas plasma sterilization. The process needs materials that are compatible with the vaporized hydrogen peroxide, which typically excludes organic materials, including cotton.

On the other hand, steam sterilization, dry heat sterilization, and ethylene oxide gas sterilization can accommodate cotton gauze. Steam sterilization is effective with moisture-retaining materials, and cotton gauze can easily be penetrated by steam. Dry heat sterilization, while typically less common for absorbent materials, can also work with cotton as it involves prolonged exposure to high temperatures that can dehydrate the material. Ethylene oxide gas sterilization is compatible with cotton, as it can penetrate to sterilize even complex instruments and wraps made of this material, although the gas process is slower and requires careful handling due to toxicity.