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

用单纤维方法检测了犬骨内种植体的机械感受器的响应特性，并与对照实验进行了比较。术后3个月拔除21只犬的3颗右下颌切牙，植入单晶蓝宝石骨内种植体。分别于植入后3个月、6个月、9个月、12个月进行动物实验。记录从下牙槽神经分离的单个纤维的反应。使用电控机械刺激器对植入物施加方波、斜波和振动正弦波刺激，分离出130根对机械刺激有反应的单纤维。所有这些机械感受性传入都属于快速型(FA)和中间型(IM)。这些单位的强度函数表现为刺激强度与第一秒内的累积冲量数、位移速度与放电频率呈线性关系，且呈对数坐标关系(logY=a+blogX)。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。其中一例呈现典型的调谐曲线。调谐点的平均频率为8.3 Hz。其余的频率不存在最佳频率，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。对照实验和骨内种植体机械感受器的平均传导速度分别为30.6m/s和20.5m/s。两组比较差异有统计学意义(P&lt；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).