Local anesthetic agents are not effective when injected into an area where a tooth or soft tissue is infected because:
A)increased swelling in tissue dilutes the anesthetic.
B)an increase of lymphocytes, in the area to combat the infection, will interfere with the effectiveness of the anesthetic solution.
C)increased blood flow in an area of infection rapidly carries the anesthetic away from the area.
D)the infection causes local temperature to rise above the point where local anesthetic is effective.

Question

Quizplus · Accepted Answer

Local anesthetic agents are not effective when injected into an area where a tooth or soft tissue is infected,because the release of products of cell destruction,owing to an increase of lymphocytes in the area to combat the infection,causes increased acidity.
Increased swelling in tissue does not dilute the anesthetic sufficiently to render it ineffective.
Increased blood flow in an area of infection does not carry the anesthetic away from the area sufficiently to render it ineffective.
A rise in local temperature is not sufficient to render it ineffective.

Local Anesthetic Agents Are Not Effective When Injected into an Area