Effect of duration from lingual nerve injury to undergoing microneurosurgery on improving sensory and taste functions: retrospective study
Nakanishi Takashi, Yamamoto Yuta, Tanioka Kensuke, Shintani Yukari, Tojyo Itaru, Fujita Shigeyuki,
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( Nakanishi Takashi ) - Wakayama Medical University Department of Oral and Maxillofacial Surgery
( Yamamoto Yuta ) - Wakayama Medical University Department of Anatomy and Cell Biology
( Tanioka Kensuke ) - Wakayama Medical University Clinical Study Support Center
( Shintani Yukari ) - Wakayama Medical University Department of Oral and Maxillofacial Surgery
( Tojyo Itaru ) - Wakayama Medical University Department of Oral and Maxillofacial Surgery
( Fujita Shigeyuki ) - Wakayama Medical University Department of Oral and Maxillofacial Surgery
Abstract
Background: The prognosis of recovery following microneurosurgery for injured lingual nerves varies among individual cases. This study aimed to investigate if recovery ratios of sensory and taste functions are improved by the microneurosurgery within 6 months after lingual nerve injury.
Methods: We retrospectively assessed 70 patients who underwent microneurosurgery at the Wakayama Medical University Hospital for lingual nerve injuries between July 2004 and December 2016. Sensory and taste functions in lingual nerves were preoperatively evaluated using a static two-point discrimination test, an intact superficial pain/tactile sensation test, and a taste discrimination test. They were evaluated again at 12 and at 24?months postoperatively. The abundance ratio of Schwann cells in the excised traumatic neuromas was analyzed with ImageJ software following immunohistochemistry with anti S-100β antibody.
Results: In early cases (microneurosurgery within 6?months after the injury), recovery ratios of sensory and taste functions were not significantly different at 24?months after microneurosurgery compared with later cases (microneurosurgery more than 6?months after the injury). Meanwhile, the ratio of patients with taste recovery within 12?months after microneurosurgery was significantly decreased in late cases compared with early cases. The abundance ratio of Schwann cells in traumatic neuroma was also significantly lower in later cases.
Conclusion: Microneurosurgery more than 6 months after lingual nerve injury did not lead to decreased recovery ratio of sensory and taste functions, but it did lead to prolonged recovery of taste. This delay may be associated with a decrease in the abundance ratio of Schwann cells in traumatic neuromas.
키워드
Duration time to surgery; Lingual nerve; Microneurosurgery; Peripheral nerve recovery; Schwann cells taste function
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