患者，女，64岁。双侧下颌中切牙II度松动；左上尖牙残根，左上第一磨牙残冠，拟分次拔除患牙。患者无全身性重大疾病，血压160/90mmHg，心电图正常。为患者拔除双侧下颌中切牙时,最适合选用的麻醉是

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