What is the estimated anesthetic effect duration on soft tissue when using 2% lidocaine with 1:100,000 epinephrine?

The duration of the anesthetic effect on soft tissue when using 2% lidocaine with 1:100,000 epinephrine is generally around 60 to 120 minutes, or 1 to 2 hours. This duration is influenced by the addition of epinephrine, which serves as a vasoconstrictor, prolonging the anesthetic effect by reducing blood flow to the area.

While the effect can sometimes be perceived as somewhat longer due to the presence of the vasoconstrictor, estimates typically range closer to the 1 to 2-hour mark, rather than the 3 to 5 hours suggested by one of the choices. This underscores the importance of understanding both the type of local anesthetic used and the implications of combining it with a vasoconstrictor like epinephrine for dental procedures involving soft tissue anesthesia.