紫外光處理對納米化鈦表面理化性能及生物學活動影響的機制探究
[Abstract]:Background: dental implant is widely used in clinic because of its ideal restoration effect. However, it takes 3 to 6 months for the artificial implant teeth to be implanted into the bone. During this period, the mastication and language functions of the patients can not be restored in time, and the longer the time of bone bonding is, The higher the risk of failure during external force. At present, it is hoped that the process of bone bonding after implant implantation can be accelerated by titanium surface treatment, and the realization of immediate implantation and early loading has become one of the hotspots in dental implant research. In order to overcome the limitations of traditional micron implants in the application of immediate implants, surface modification of titanium implant with nano-scale modification has been proposed, and nano-scale modification can better simulate the bone tissue environment in vivo. To promote the development of implant-bone bonding. In addition, implant aging is one of the most common clinical problems. It has been proved that the surface energy of the traditional surface modified implants can change with the prolongation of the preservation time, which affects the bone binding process. It has been proved that Ultraviolet UV can effectively improve the surface energy of titanium implants and improve the bone binding efficiency. Theoretically, the effect of UV photocatalysis should be improved with the increase of the specific surface area of the material by using nano-scale modification with higher surface area instead of the traditional micrometer modified implant. However, the effects of UV treatment on the biological and physical and chemical properties of titanium surface, especially the changes of surface elements and the charge state, need to be further explored. Objective: to study the effects of UV light treatment on the surface physicochemical properties and biological activity of nano-modified titanium. [methods] Nanotube morphology (AO group) was prepared on pure titanium surface by anodic oxidation technique. The nanotubes were prepared by UV photocatalytic (AO UV group. The physical and chemical properties of the material surface were analyzed by scanning electron microscope (SEM) (SEM), surface roughness tester, contact angle tester and solid Zeta potentiometer. In vitro protein adsorption test and in vitro cytological test were used to detect the early biological activity of the two groups. [results]: the morphology and surface roughness of titanium nanotubes with 70-100nm diameter were prepared stably on pure titanium surface by anodic oxidation technique. The results showed that the surface morphology and surface roughness of titanium nanotubes before and after UV catalysis were the same. The surface hydrophilicity of titanium nanotubes was improved by UV treatment without obvious difference. The contact angle changed from 51.5 擄to 6.2 擄. The elemental composition of titanium nanotubes before and after UV catalysis was analyzed by XPS. It was found that UV catalysis reduced inorganic and organic contamination on the surface of titanium nanotubes and exposed more Ti3 Ti4 sites. More notable, however, is the change in the peak value of the O element. After UV photocatalysis, the peak value of acidic hydroxyl groups on the surface of titanium nanotubes was decreased and the basic hydroxyl groups increased. After UV treatment, the surface isoelectric point of titanium nanotubes was decreased, and the negative charge carried in body fluid was obviously decreased by measuring the real time potential of the two groups. The results of biological experiments in vitro showed that UV catalysis greatly enhanced the adsorption capacity of protein on the surface of titanium. The amount of adsorption on titanium surface of AO UV group was even higher than that of AO group after incubation for 3 h. UV treatment significantly increased osteoblast adsorption on titanium nanotubes. Early adhesion to the surface, The adhesion rate of osteoblasts on the surface of osteoblasts was increased, the adhesion morphology of the cells was affected, and the remodeling of cytoskeleton and the formation of adhesion plaque were promoted. [conclusion] UV treatment promoted the early biological activities of titanium nanotubes, which was related to the change of surface charge caused by the change of acid, basic and hydroxyl groups on the surface of titanium nanotubes.
【學位授予單位】:南方醫(yī)科大學
【學位級別】:博士
【學位授予年份】:2017
【分類號】:R783.6
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