3. Assessment of pain variables
Pain, pain
The participants were requested to grade their perceived pain intensity continuously on a 0 to 100 mm Visual Analogue Scale (VAS), with 0 representing “no pain” and 100 representing “worst imaginable pain”. Pain intensity was marked as participants were prompted to do so every fifteenth second for 5 minutes (20 grades in total). At the end of the last grading, 5 minutes after injection, the participants were asked to mark the maximal subjective induced pain spread using a chart drawing with two lateral views of the head, one extraoral and one intraoral.