What is a common characteristic of a necrotic pulp?

A necrotic pulp is characterized primarily by the absence of an internal blood supply. This lack of blood flow means that the pulp tissue, which is made up of nerves and blood vessels, becomes dead and unable to heal or respond to stimuli in the same way a healthy pulp would. This condition typically arises due to various factors, such as deep decay, trauma, or infection, which can disrupt the health of the pulp.

The absence of blood supply not only confirms the necrosis but also leads to symptoms associated with pulp death, such as pain or a lack of sensation. Unlike a healthy pulp, which can react to thermal stimuli and maintain tooth vitality, a necrotic pulp will not exhibit normal responses to such stimuli, indicating its compromised state.

Other characteristics like tooth mobility or sensitivity to percussion may be observed in various dental conditions, but they are not defining traits of necrotic pulp specifically. The focus on the absence of blood supply is essential since it highlights the fundamental reason for the dysfunction and necrosis of the pulp tissue.