Effect of dexmedetomidine on the local anesthetic action and the circulatory system

INTERVENTION: We inject with 0.7% Lidocaine solution(EC50)1ml under the mouth mucosa.And we measure the local perception using Pain Vision(R) and blood pressure, heart rate,arrhythmia,and oxygen saturation as measured using pulse oximetry every 10 minutes until 120 minutes. We inject with 0.7% Lidocaine solution with dexmedetomidine10‐6M 1ml under the mouth mucosa. And we measure the local perception using Pain Vision(R) and bloodpressure,heartrate,arrhythmia,and oxygen saturation as measured using pulse oximetry every 10 minutes until 120 minutes. CONDITION: Healthy body PRIMARY OUTCOME: Measuring the local perception using Pain Vision(R) and blood pressure, heart rate,arrhythmia,and oxygen saturation as measured using pulse oximetry. INCLUSION CRITERIA: Healthy body. Student and ataff of okayama university hospital with agreement.