Kumazawa Y, Sekiguchi J, Saito M, Honma K, Toyoda M, Matsuo E
The 1st Department of Prosthetic Dentistry, Kanagawa Dental College.
Kanagawa Shigaku. 1990 Sep;25(2):242-9.
The authors used a human dry skull on which the cranial bone mandible had been joined with an artificial articulator disk to form a single unit. Impact acceleration corresponding to weak and strong tapping was considered a dynamic load in examining the vibration transfer characteristics of the facial cranial bone when impact was applied from the mentum section in a situation designed to be closer to reality. Flexion injection type (resonance frequency f0 = 100 to 150 Hz, produced by GC Corp.) was applied to the human dry skull as an artificial periodontal membrane at thickness of 0.3 mm. In addition, Exaflex heavy body type (f0 = 400 Hz, produced by GC Corp.) was applied as an artificial disk. This was then placed on a damper produced by spreading a rubber dam sheet with a thickness of 35 microns on a tire tube with a diameter of 35 cm and an air pressure of 35 kg/cm2. Investigations were then made concerning linearity and reciprocity to determine whether an experimental system could be achieved or not. This was then followed by modal analysis. As a result, the following matters were ascertained: (1) The resonating area differed according to the extent of the force. (2) An increase in the viscoelastic elements of the silicon was accompanied by attenuation of force. (3) Directionality of force attenuation was caused by the complexity of bone structure. (4) A tapping force of 0.3G or 1G was sufficiently attenuated by the facial cranial bone. (5) The transfer function at the bone seams and thinner areas of the bones was insufficient for modal analysis of the facial region and total cranial bone of the human dry skull.
作者使用了一个人类干燥头骨，其上颅骨下颌骨已与人工关节盘连接形成一个单一单元。在模拟更接近实际的情况下，从颏部施加冲击时，将对应于弱敲击和强敲击的冲击加速度视为动态载荷，用于研究面部颅骨的振动传递特性。将弯曲注射型（共振频率f0 = 100至150 Hz，由GC公司生产）以0.3毫米的厚度作为人工牙周膜施加到人类干燥头骨上。此外，将Exaflex重体类型（f0 = 400 Hz，由GC公司生产）作为人工盘施加。然后将其放置在一个减震器上，该减震器是通过将厚度为35微米的橡胶坝片铺展在直径为35厘米、气压为35 kg/cm2的轮胎内胎上制成的。然后进行关于线性和互易性的研究，以确定是否能够实现一个实验系统。随后进行模态分析。结果确定了以下事项：(1) 共振区域根据力的大小而不同。(2) 硅的粘弹性元件增加伴随着力的衰减。(3) 力衰减的方向性是由骨结构的复杂性引起的。(4) 0.3G或1G的敲击力被面部颅骨充分衰减。(5) 在人类干燥头骨的面部区域和整个颅骨的骨缝和较薄区域的传递函数不足以进行模态分析。
