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  • Title: Analgesic effect of a lidocaine-ropivacaine mixture for extraction of impacted mandibular third molars: a randomized controlled trial.
    Author: Hemmi T, Sasahara N, Yusa K, Ishikawa S, Kobayashi T, Iino M.
    Journal: Clin Oral Investig; 2023 Oct; 27(10):5969-5975. PubMed ID: 37608239.
    Abstract:
    OBJECTIVES: The painless postoperative period can be significantly prolonged by using long-acting local anesthetics such as ropivacaine, though these local anesthetics are known for their slower onset of action. To compensate for this, a mixture of short-onset (e.g., lidocaine) and long-acting local anesthetics is used. However, the efficacy of such an anesthetic cocktail has not been elucidated in the field of oral and maxillofacial surgery. MATERIALS AND METHODS: To address the research purpose, this prospective randomized controlled trial included 56 patients scheduled for impacted mandibular third molar extraction. All patients received the inferior alveolar nerve block (IANB) using either 2% lidocaine with epinephrine or a 1:1 mixture of 2% lidocaine with epinephrine and 0.75% ropivacaine. RESULTS: Patients anesthetized using the lidocaine-ropivacaine mixture showed significantly prolonged postoperative analgesia and pain control than those anesthetized using lidocaine only. CONCLUSIONS: IANB using a lidocaine-ropivacaine mixture can provide prolonged postoperative anesthesia and pain control with extraction of mandibular third molars. CLINICAL RELEVANCE: This method can be a noteworthy addition to existing methods of local anesthesia for the extraction of mandibular third molars. Trial registration number University Hospital Medical Information Network (No. UMIN000044315).
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