Which materials cannot be sterilized using an autoclave?

The correct answer indicates that glass cannot be sterilized using an autoclave, which is not accurate. Glass items can indeed be sterilized in an autoclave since they can withstand high temperatures and steam. Autoclaves operate by using high-pressure steam to eliminate microorganisms, making them effective for materials that are heat-stable and non-porous.

In the context of the other materials mentioned, plastic and rubber are often not suitable for autoclaving. This is due to their potential to melt or deform under the high temperatures and pressures of an autoclave. Metal can generally be sterilized, assuming it is corrosion-resistant and can endure the conditions inside an autoclave without warping or damage.

Understanding the properties of materials in terms of their heat resistance and structural integrity under pressure is crucial when determining if they can be properly sterilized in an autoclave. Recognizing these characteristics helps practitioners ensure that all tools and materials used in esthetics are properly disinfected and safe for client use.