How verbal exchange before intravenous cannulation effects pain: a randomized controlled trial in the dental clinic

INTERVENTION: The intervention involves communicating information prior to i.v. cannula insertion without using words with painful content. The intervention involves communicating information prior to i.v. cannula insertion with painful content. CONDITION: Tooth Disease PRIMARY OUTCOME: verbal numerical rating score(VNRS); visual analogue scale(VAS) SECONDARY OUTCOME: (1)Whether or not there is unprompted vocalization of pain or discomfort, during i.v. cannulation.; (2) Whether or not there is spontaneous patient arm withdrawal during i.v. cannulation.; (3) Whether or not there is Medical emergency. INCLUSION CRITERIA: The patients awaiting i.v. cannulation before dental treatments in our department/ASA Physical Status 1 or 2/Provided written informed consent to undergo the procedure.