Ou M, Ohyama T
Department of Maxillofacial Prosthetics, Life Science of Maxillofacial Systems, Dental Research Division, Tokyo Medical and Dental University, Japan.
Bull Tokyo Med Dent Univ. 1996 Mar;43(1):13-24.
The modal analysis on vibration in the human dry skull with and without mouthguards was performed in order to clarify which elasticity modulus of the material and what form of the mouthguard are best. Nine different mouthguards were prepared for this study from three materials with different elasticity moduli amd three different forms: Soft MOLTENO (registered) mouthguards of long, middle, and short forms. Regular MOLENTO (registered) mouthguards of long, middle and short forms, and Hard MOLENTO(registered) mouthguards of long, middle and short forms. Thirty-five measurement points were established on the skull. The main measurement system was composed of a 512-D Vibration Generator, LV-1300 Laser-Doppler Vibrometer, CF-6400 FFT Analyzer, PC-9821Xn personal computer, and Vibrant PC modal analysis software. The decay rate was calculated to evaluate effectiveness of the absorption of vibration of the skull with and without mouthguards when stress was put on the skull. The results showed that he skull fitted with the long and middle mouthguards made of regular MOLTENO (registered) had a higher decay rate than the skull w the mouthguard, and that the material properties of the mouthguards influenced the absorption of the skull vibration more intensively that did the forms of the mouthguards.
为了明确哪种材料弹性模量和何种形式的护齿器效果最佳，对佩戴和未佩戴护齿器的人体干燥颅骨进行了振动模态分析。本研究用三种具有不同弹性模量的材料制备了九种不同的护齿器，包括三种不同形式：长、中、短款的软质MOLTENO（注册商标）护齿器；长、中、短款的常规MOLTENO（注册商标）护齿器；以及长、中、短款的硬质MOLTENO（注册商标）护齿器。在颅骨上设置了35个测量点。主要测量系统由一台512-D振动发生器、LV-1300激光多普勒测振仪、CF-6400快速傅里叶变换分析仪、PC-9821Xn个人计算机以及Vibrant PC模态分析软件组成。计算衰减率以评估在颅骨受力时佩戴和未佩戴护齿器情况下颅骨振动吸收的效果。结果表明，佩戴常规MOLTENO（注册商标）材质的长款和中款护齿器的颅骨比未佩戴护齿器的颅骨具有更高的衰减率，并且护齿器的材料特性对颅骨振动吸收的影响比护齿器的形式更为强烈。
