What is a potential consequence of excessive reduction during tooth preparation?

Excessive reduction during tooth preparation can lead to thermal hypersensitivity. This phenomenon occurs because the protective enamel layer is compromised, exposing the underlying dentin to external stimuli. When the dentin is exposed, it allows for the transmission of temperature changes to the pulp, which can cause discomfort or pain in response to heat or cold.

In addition to thermal hypersensitivity, excessive reduction can compromise the overall integrity of the tooth structure, making it less resilient to stresses and potentially leading to other complications such as weakened dentin or increased susceptibility to caries. While options like margin overextension, shortening of the root surface, and peri-apical inflammation are also significant considerations in tooth preparation, they are less directly associated with the immediate sensory response to temperature changes that thermal hypersensitivity entails.