Vibration response study and dynamic modulus analysis of implant prostheses

• Main Authors: Chang Yun-Feng, 張雲峰
• Other Authors: 石 淦 生
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/42872257788631457162

碩士 === 國防醫學院 === 牙醫科學研究所 === 91 === Past researches using static stress analysis often fail to prove the theory that resin, a prosthetic material, has damping effect in protecting implant osseointegration and promoting bone density. In this study, a vibration analysis is employed to compare different prosthetic materials’ damping ratios and natural frequencies. In addition, a dynamic mechanical analyzer (DMA) is used to calculate the dynamic properties of the studied materials. A dynamic impulse test based on free vibration analysis concept is used to measure natural frequency along with damping ratio of implanted resin prostheses. Metal prosthetic materials are used as the control group; the clinically-adopted resin prostheses are set as the experiment groups. The latter contains seven provisional restoration and thirteen denture base materials, all through various processes. The sample size number of each group is eight; a total of 160 samples are used. The method is the following: firstly, to excite the sample by a solenoid; secondly, allow piezoelectric force sensor and laser displacement meter to receive the responding signals. The signals are later processed through a dynamic vibration analyzer that applies fast Fourier transform (FFT) function to obtain the vibration parameters of damping ratio and natural frequency. In order to compare dynamic modulus with Tanδof resin prosthetic material selections, a dynamic mechanical analyzer is employed to conduct temperature scan, frequency scan, time scan, and creep recovery testing. Vibration test data is analyzed in one-way analysis of variance (ANOVA). The damping ratio and natural frequency of measured materials all have significant differences (P<0.001). Differential Scanning Calorimeter (DSC) and DMA measurement further indicated that (1) water influences the plastic effect of most resin materials; (2) solvent remains after the polymerization of self-cured materials, and incomplete polymerization results in the increase of materials’ Damping abilities (3) the thermocycling effect on resin materials leads to variations of materials’ Damping abilities. In summation, the implant prostheses require the consideration of stress-absorbing and resonance effect, and the study provides some suggestions for the clinic selection.