NCT07401641 2026-02-10Effect of Dezocine Versus Nalbuphine Combined With Sufentanil on Postoperative Analgesia, Complications, and Free Flap Survival in Patients Undergoing Oral Cancer Radical Surgery: A Randomized Controlled Clinical Trial.Sun Yat-Sen Memorial Hospital of Sun Yat-Sen UniversityPhase NA Recruiting60 enrolled