Vasconcelos Belmiro Cavalcanti do Egito, Gay Escoda Cosme, Vasconcellos Ricardo José de Holanda, Neves Riedel Frota Sá Nogueira
School of Dentistry, University of Pernambuco.
Pesqui Odontol Bras. 2003 Apr-Jun;17(2):126-31. doi: 10.1590/s1517-74912003000200005. Epub 2003 Oct 10.
The aim of this study was to evaluate standardized conduction velocity data for uninjured facial nerve and facial nerve repaired with autologous graft nerves and synthetic materials. An evaluation was made measuring the preoperative differences in the facial nerve conduction velocities on either side, and ascertaining the existence of a positive correlation between facial nerve conduction velocity and the number of axons regenerated postoperatively. In 17 rabbits, bilateral facial nerve motor action potentials were recorded pre- and postoperatively. The stimulation surface electrodes were placed on the auricular pavilion (facial nerve trunk) and the recording surface electrodes were placed on the quadratus labii inferior muscle. The facial nerves were isolated, transected and separated 10 mm apart. The gap between the two nerve ends was repaired with autologous nerve grafts and PTFE-e (polytetrafluoroethylene) or collagen tubes. The mean of maximal conduction velocity of the facial nerve was 41.10 m/s. After 15 days no nerve conduction was evoked in the evaluated group. For the period of 2 and 4 months the mean conduction velocity was approximately 50% of the normal value in the subgroups assessed. A significant correlation was observed between the conduction velocity and the number of regenerated axons. Noninvasive functional evaluation with surface electrodes can be useful for stimulating and recording muscle action potentials and for assessing the functional state of the facial nerve.
本研究的目的是评估未损伤的面神经以及用自体移植神经和合成材料修复的面神经的标准化传导速度数据。通过测量术前两侧面神经传导速度的差异，并确定面神经传导速度与术后再生轴突数量之间是否存在正相关来进行评估。在17只兔子身上，记录了术前和术后双侧面神经运动动作电位。刺激表面电极置于耳廓（面神经干）上，记录表面电极置于下唇方肌上。分离面神经，横断并将两端分开10毫米。用自体神经移植物和聚四氟乙烯-e（聚四氟乙烯）或胶原管修复两端之间的间隙。面神经最大传导速度的平均值为41.10米/秒。15天后，评估组未诱发出神经传导。在评估的亚组中，2个月和4个月时平均传导速度约为正常值的50%。观察到传导速度与再生轴突数量之间存在显著相关性。使用表面电极进行无创功能评估可用于刺激和记录肌肉动作电位以及评估面神经的功能状态。
