The electrophysiological properties of mechano receptive units in case of endosseous dental implants in the dog.

用单纤维法研究了犬骨内牙种植体机械感受单位的反应特性，并与对照组进行了比较。三个月后，将21只狗的三颗右下颌切牙取出，并将单晶蓝宝石骨内牙种植体植入无牙槽嵴中。植入后3个月、6个月、9个月、12个月，动物接受实验。从下齿槽神经解剖的单纤维记录反应。用电控机械刺激器对种植体施加方波、斜波和振动正弦波刺激，分离出130条对机械刺激有反应的单纤维。这些机械感受性传入均属于快速适应型（FA）和中间型（IM）。各单位的强度函数均显示刺激强度与第1秒内的累积脉冲数、位移速度与放电频率呈线性关系，且均符合对数坐标（logY =a+B logX）。根据对振动正弦波刺激的反应特性，将FA型和IM型分为两类。一个显示了典型的调谐曲线。调谐点的平均值为8.3Hz。其他的没有一个最佳的频率和阈值幅度产生一个到一个放电的正弦刺激增加刺激频率的增加。对照组和骨内种植体的机械感受单位平均传导速度分别为30.6m/s和20.5m/s。两组间有显著性差异（P<0.01）。

The response properties of mechanoreceptive units were examined by the single fiber method in endosseous dental implants in the dog, which were compared to those of control experiments. Three right mandibular incisors of twenty one dogs were removed and single-crystal sapphire endosseous dental implants were set in the edentulous ridge after three months. Three,six nine,twelve months after implantation, animals were subjected to the experiments. Responses were recorded from single fiber dissected from the inferior alreolar nerve. Square, ramp and Vibratory sine wave stimuli were applied to the implants using an electrically controlled mechanical stimulator.One hundred and thirty single fibers responding to the mechanical stimuli applied to implants were isolated. All of these mechanoreceptive afferents belonged to fast adgpting type (FA) and intermediate type (IM). Intensity functions of these units showed a linear relationship between the stimulus intensity and cumulative impulse number during the first second, and between displacement velocity and discharge frequency, which adgpted to logarithmic co-ordinates (log Y=a+b log X). The FA and IM types were classified into two types from the response properties to vibratory sine wave stimulus. one Showed typical tuning curve. The average of tuning points was 8.3Hz. The others did not have an optimal frequency and the threshold amplitude producing one to one discharge to the sinusoidal stimulus increased as stimulus frequency increased. The average conduction Velocities of mechano receptive units in control experiment and endosseous implants were 30.6m/sec and 20.5m/sec respectively. There were significant difference between them (P<0.01).