Early tissue reaction in the tension zone of PDL during orthodontic tooth movement

被引:24
|
作者
Tsuge, A. [1 ]
Noda, K. [1 ]
Nakamura, Y. [1 ]
机构
[1] Tsurumi Univ, Sch Dent Med, Dept Orthodont, Yokohama, Kanagawa, Japan
基金
日本学术振兴会;
关键词
Interleukin-1; beta; Pentraxin; 3; Basic fibroblast growth factor; Inflammation; Laser capture microdissection; FIBROBLAST-GROWTH-FACTOR; RAT PERIODONTAL-LIGAMENT; OSTEOBLAST DIFFERENTIATION; INFLAMMATION; CELLS; INTERLEUKIN-1; INCIDENT; DISEASE; PROTEIN; PTX3;
D O I
10.1016/j.archoralbio.2016.01.007
中图分类号
R78 [口腔科学];
学科分类号
1003 ;
摘要
Objective: The aim of the study was to examine the early tissue reaction in the tension zone of periodontal ligament (PDL) during orthodontic tooth movement. Design: Upper first molars of rats were moved buccally with fixed appliances. The PDL in the tension zone was examined histologically, immunohistochemically and at a molecular level after 24 h, 3 days and 7 days. Results: After 24 h of orthodontic force loading, the periodontal space appeared considerably expanded. The periodontal fibers were stretched between the bone and the root. Three days after loading, the expanded periodontal space had slightly narrowed, the periodontal fiber arrangement was relaxed, and the blood vessels did not appear elongated. A considerable layer of osteoid was formed on the bone surface. The total cross-sectional areas of the PDL in experimental groups were significantly larger than control group. The total cross-sectional areas of the blood vessels were not significantly different among the groups. Significantly high expressions of IL-1 beta and PTX3 were characteristically observed not only in the endothelial cells and cells around the blood vessel, but also in fibroblasts throughout the PDL of the tension zone 24 h after orthodontic force loading. Three and 7 days after loading, these showed tendencies to return to control levels. Conclusions: The present results suggest that the early reaction in the tension zone of the PDL during tooth movement consists of two phases: first, inflammation and second, rapid recovery and renovation of the PDL with bone formation. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码:17 / 25
页数:9
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