牽張成骨后正畸牙齦溝液中AST水平變化研究
[Abstract]:Objective to observe the dynamic changes of aspartate aminotransferase (AST) in gingival crevicular fluid (GCF) after the mandibular distraction osteogenesis model was established in dogs. Thus, the reconstruction of periodontal tissue was analyzed. Methods eight beagle dogs with no periodontal disease and normal permanent dentition were selected and were excluded from periodontal disease, third premolar defect, crown fracture, loosening, malformation and other dental pulp diseases. After distraction osteogenesis between the third and fourth premolars of the mandible, 8 dogs were randomly divided into two groups: one group (2 weeks later) and the other group (6 weeks) moving teeth. There were 4 rats in each group. Gingival crevicular fluid (GCF) from filter paper was recovered by centrifugal washing method to detect the level of AST. The experimental teeth of the two groups were observed at different time points (1d/2d/3d/7d/14d/28d). The dynamic changes of AST level in gingival crevicular fluid at different sites (near and far). Results all the selected experimental animals were able to tolerate distraction osteogenesis and were replaced by new bone tissue in the space of distraction osteogenesis regeneration zone. The expected distraction distance was obtained. The new bone area of distraction osteogenesis is hard, the continuity of bone is better, the bone cortex is flat basically, and there are no adverse symptoms such as large area of bone defect or nonunion of mandible in distraction osteogenesis area. But the tongue side was bulging and slightly rough. After distraction osteogenesis, the bone mineral density of the new bone region was observed by X-ray film. The results showed that the bone density of the new bone was basically the same as that of the autogenous bone, and there was no obvious boundary between the two kinds of bone. The AST level of the two experimental teeth increased gradually after three days of stress, and the increase was more obvious in the second week than in the sixth week. On the contrary, the AST level began to decrease at 7 d, reached the lowest level at 21 d, then recovered to increase trend, and AST level reached a higher level again at 28 d. Conclusion: in this experiment, beagle dog was selected as experimental object of distraction osteogenesis, and a relatively scientific, simple and reliable animal model was established according to its own characteristics. The traction speed and frequency can be controlled in the experiment, which lays the foundation of animal model in other related distraction osteogenesis experiments. It was also found that the overall level of AST in gingival crevicular fluid was significantly higher than that after 6 weeks of distraction osteogenesis, but the change of AST level was not linear with the passage of time. This kind of change has certain guiding significance to the clinical research in the future. Although the movement of teeth after 2 weeks of osteogenesis was faster than that of 6 weeks, the change of AST level in moving gingival crevicular fluid was found to be relatively serious by analyzing the changes of AST level in moving gingival crevicular fluid. Therefore, the dynamic change of AST in gingival crevicular fluid can be used as an effective index to judge and select the best time to apply orthodontic force after distraction osteogenesis. However, the cost of using beagle dog as experimental object is relatively high, so this experiment is only a small sample animal experiment, and the conclusions need to be further studied and demonstrated.
【學位授予單位】:安徽醫(yī)科大學
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:R783.5
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