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, Jääskeläinen 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
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.
(JOURNAL OF DENTAL IMPLANT RESEARCH 2014;33(1):7-11)