Which of the following is an example of an engineering control?

The correct answer highlights the concept of engineering controls, which involve modifications to the environment or equipment that can help reduce exposure to hazards. Shields used for dental procedures are a perfect example of engineering controls because they provide a physical barrier between the patient and the dental professional. This barrier helps minimize the risk of exposure to aerosols, splatter, and other potential contaminants during dental treatments.

Using shields effectively changes the working environment in a way that protects practitioners from direct exposure to infectious agents. It is a proactive solution that relies on physical modifications rather than relying solely on personal protective equipment or behavioral changes.

Handwashing stations represent administrative controls and personal hygiene, while N95 respirators are classified as personal protective equipment. Training sessions aim to educate staff but do not provide a physical change to reduce risk. Thus, the selection of shields as an engineering control accurately reflects the intent of using physical measures to enhance safety in a dental practice environment.