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Background: Oral cancer radical surgery often requires free flap reconstruction. Postoperative pain is severe, and traditional opioids like sufentanil have side effects and may adversely affect tumor biology. Dezocine and nalbuphine are opioid agonist-antagonists with potentially better safety profiles. Their comparative effects on analgesia, complications, and flap survival in oral cancer surgery are unknown. Objective: To compare the efficacy of dezocine versus nalbuphine, both combined with sufentanil, for postoperative analgesia, and to evaluate their impact on postoperative complications and free flap survival/function in patients undergoing oral cancer radical surgery with flap reconstruction. Methods: This is a prospective, randomized, double-blind, controlled trial. Sixty eligible patients (aged 18-70, ASA I-III) will be randomly assigned (1:1) to receive postoperative patient-
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