The tools and technique dentist's use when handling dental needles can play an important role in inducing or preventing pain. There are several ways this can come about.
Dull Needles - Naturally a duller needle will penetrate the tissue less easily. This will result in a more painful injection. Fortunately, today this issue is far less prevalent thanks to the popularity of disposables. Still though, dentists will often times be forced to administer several injections to one patient. When this happens it is important to remember that the same needle can only be reused 3 or 4 times before it becomes dull.
Pressure - When you bump your head your first reaction is to rub contact point. This is due to the Gate Control Theory that explains how direct pressure will reduce pain. Just like you rub your head, dentists should apply direct pressure to the area to be pierced. In several parts of the mouth they should also stretch the skin so that they have a taut surface. When these two steps are not followed it can easily result in an unnecessarily painful procedure.
Anesthetics
Perhaps the most important technique used in injection pain reduction is the use of anesthetics. While these are necessary for patient comfort in many surgical procedures, they themselves can actually cause a certain degree of pain. When the anesthetic is first injected a burning sensation may be experienced. This is due to the difference between the pH levels of the drug and of the tissue. Many patients incorrectly connect this pain to the penetration of the needle. Fortunately however, as the anesthetic kicks in it should subside.
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