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

采用单纤维法研究了犬牙内种植体机械感受单元的反应特性，并与对照实验进行了比较。术后3个月取出21只犬右下颌切牙3颗，在无牙嵴内植入单晶蓝宝石种植体。植入后3个月、6个月、9个月、12个月，对动物进行实验。从下网状神经上分离的单根纤维记录反应。使用电控机械刺激器对植入物施加方形、斜坡和振动正弦波刺激。对植入物的机械刺激有反应的130个单纤维被分离出来。这些机械感受性事件均属于快速适应型（FA）和中间型（IM）。这些单元的强度函数在第一秒内的刺激强度与累计脉冲数、位移速度与放电频率之间呈线性关系，并适应对数坐标（log Y=a+b log X）。根据对振动正弦波刺激的响应特性，将FA型和IM型分为两类。1 .显示典型的调谐曲线。调音点的平均值为8.3Hz。其余的没有最优频率，对正弦刺激产生一对一放电的阈值幅度随着刺激频率的增加而增加。机械接受单元的平均传导速度分别为30.6m/s和20.5m/s。两组间差异有统计学意义（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).