Local Anesthetic Agents Are Not Effective When Injected into an Area

question 21

Multiple Choice

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.

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