基于激光三維打印的類骨小梁多孔鈦種植體的設(shè)計(jì)及其體內(nèi)成骨效應(yīng)研究
[Abstract]:The appearance of laser three-dimensional printing technology has greatly promoted the development of materials science. In order to improve the bone-binding ability of titanium implants and solve the problem of excessive elastic modulus, some scholars have proposed 3D porous materials of bone-like trabeculae based on the biomimetic concept in bone tissue engineering. The good osteogenic effect was verified by a large number of experiments in vivo and in vitro. The team believes that several important issues remain unresolved on the basis of previous studies. First, compared with the osseointegration of solid implant-bone interface, can bone tissue grow into porous structure to improve the strength of osseointegration between implant-bone interface? Second, the ideal pore structure characteristics are still uncertain. Third, previous studies have shown that porous implants can improve the stability of the implant, but it is not clear whether the porous implant can achieve sufficient stability in the short term. In order to solve the above problems, three kinds of porous bone trabecular implants with different porosity (6575 and 85, corresponding pore size of 200350500 渭 m) and a group of solid titanium implants were made by using laser three-dimensional printing technique as control group. In vitro micro-CT scanning and scanning electron microscopy were performed to analyze the porous structure and mechanical properties were tested. Then the implants were implanted into the femur of New Zealand rabbits. The osteogenic effect of osseous trabecular porous implants was studied by hard tissue section staining and compression. The analysis of porous structures and mechanical tests show that the porous implants used in this experiment are similar to natural bone trabeculae and the elastic modulus is close to that of natural cancellous bone. The results of methylene blue and acid fuchsin staining showed that the amount of new bone around the porous implants was significantly higher than that in the control group, and the depth of bone length into the pores increased with time. The implant with 75% porosity and 85% porosity had the best osteogenic effect. The results of extrusion experiment showed that the two groups of implants had greater compressive force. According to the results of this experiment, we answered the above questions and reached the following conclusions: (1) compared with solid implants, porous implants have better performance in guiding bone growth and bone bonding. The bonding strength of implant-bone interface can be increased by about three times. (2) the ideal porous structure of trabecular porous implants is that the porosity of 75% and 85% (pore diameter 350500 渭 m); (3) of porous implants can lead to rapid bone binding. Biological stability was obtained in a short period of time, and the results in this experiment were 2 weeks.
【學(xué)位授予單位】:重慶醫(yī)科大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:R783.6
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