Mechanical Stimuli include which of the following?

• A. Vibrations from a handpiece during tooth preparation
• B. Relating to heat
• C. Bacteria from saliva contacting pulp
• D. Acidic materials reaching pulpal tissues

Answer: (A)

Mechanical stimuli are physical forces that act on dental tissues, such as pressure, contact, or movement. Vibrations from a handpiece during tooth preparation deliver energy as a physical force to the tooth, causing deformation and fluid movement in dentin that can stimulate the pulp’s nerves. This direct mechanical energy is why it fits as a mechanical stimulus.

Heat involves a change in temperature, which is a thermal stimulus. Bacteria from saliva contacting the pulp introduces a biological/ microbial factor that can lead to chemical irritation and inflammation. Acidic materials reaching pulpal tissues cause chemical irritation, a chemical stimulus.