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KMID : 1025720140330010007
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Journal of Dental Implant Research
2014 Volume.33 No. 1 p.7 ~ p.11
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Mental nerve blink reflex for the diagnosis of the inferior alveolar nerve damage
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Cho Jun-Hyuk
Jung Hun-Jong
Kim Sun-Kyung
Lee Ju-Young
Kim Soung-Soo
Kim Jong-Sik
Byun Soo-Hwan
Kim Soung-Min
Kim Myung-Jin
Lee Jong-Ho
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Abstract
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Purpose: Many clinical tests have been developed since 1988, when Mackinnon and Dellon used a modified British Medical Research Council scale to grade injury and monitor sensory recovery following trigeminal nerve injuries. Yet little attention has been focused on standard clinical test for the diagnosis of inferior alveolar nerve damage. Recently, Jaaskelainen suggested the mental nerve blink reflex test as a new diagnostic tool for quantifying the degree of inferior alveolar nerve damage. In this study, the mental nerve blink reflex test was performed on the Korean population for the first time, and its effectiveness and clinical relevancy were confirmed.
Materials and Methods: This study mainly comprised of two experimental groups. In the first group, the mental nerve blink reflex test was performed on patients who underwent partial mandibulectomy for the treatment of squamous cell carcinoma involving the inferior alveolar nerve. The normal mental nerve blink reflex response was evaluated in the second group which consisted of 20 healthy volunteers, including 10 women and 10 men, without any neurological diseases. The mean age of the group was 29.5 years, ranging from 26 to 32 years. Neuro-EMG-micro (NeurosoftTM, Ivanovo, Russia) was used to measure the threshold current, delayed time, duration, and amplitude of mental nerve blink reflex response, and Neuro-MEPω (NeurosoftTM, Ivanovo, Russia) program was used to analyze the data.
Results: The first experimental group showed loss of mental nerve blink reflex after the surgery. In the second group, average values of 13 mA (standard deviation [SD]±8.68), 42.36 ms (SD±7.58), 38.85 ms (SD±12.41), and 198.65 mA (SD±116.08) were recorded for threshold current, delayed time, duration, and amplitude, respectively.
Conclusions: The mental nerve blink reflex test was able to clearly distinguish between anesthesia and normal blink reflex response. Upon analysis of normal response, only the delayed time showed statistical significance and possible relevance to the nerve injuries.
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KEYWORD
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Inferior alveolar nerve, Mental nerve, Sensory test, Blink reflex, Mental nerve blink reflex test
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