中国组织工程研究 ›› 2019, Vol. 23 ›› Issue (7): 1001-1006.doi: 10.3969/j.issn.2095-4344.1067

• 口腔组织构建 oral tissue construction • 上一篇    下一篇

下颌持续前导对成年及幼年期大鼠髁突软骨血管内皮生长因子表达和Micro-CT下髁突骨质变化的差异

武  敏1,李  雪1,高  洁1,杨  帅1,蔡毅志2,王明国1   

  1. (1潍坊医学院口腔医学院,山东省潍坊市  261053;2山东大学口腔医学院,山东省济南市  250012)
  • 收稿日期:2018-08-30 出版日期:2019-03-08 发布日期:2019-03-08
  • 通讯作者: 王明国,博士,主任医师,潍坊医学院口腔医学院,山东省潍坊市 261053
  • 作者简介:武敏,女,1988年生,山东省济南市人,汉族,潍坊医学院在读硕士,主要从事口腔种植与修复方面的研究。

Micro-CT changes and vascular endothelial growth factor expression in reconstructed mandibular condylar cartilage under continuous mandibular advancement in growing and adult rats

Wu Min1, Li Xue1, Gao Jie1, Yang Shuai1, Cai Yizhi2, Wang Mingguo1   

  1. (1Weifang Medical University School of Stomatology, Weifang 261053, Shandong Province, China; 2Shandong University School of Stomatology, Jinan 250012, Shandong Province, China)
  • Received:2018-08-30 Online:2019-03-08 Published:2019-03-08
  • Contact: Wang Mingguo, MD, Chief physician, Weifang Medical University School of Stomatology, Weifang 261053, Shandong Province, China
  • About author:Wu Min, Master candidate, Weifang Medical University School of Stomatology, Weifang 261053, Shandong Province, China

摘要:

文章快速阅读:

文题释义:
功能性矫治器:是一种治疗错颌畸形的装置或称正畸矫治器,它可产生作用力或者利用咀嚼肌或口周肌的功能作用力,通过戴用的矫治器传递至被矫治的部位,改变错位的牙颌器官,使错位牙齿及牙周支持组织发生改变,诱导颌面部器官的生长发育向正常方向进行。
生长因子:一类通过与特异的、高亲和的细胞膜受体结合,调节细胞生长与其他细胞功能等多效应的多肽类物质。其是由多种细胞分泌,作用于特定的靶细胞,调节细胞分裂、基质合成与组织分化的细胞因子。生长因子对不同种类细胞具有一定的专一性,通常培养细胞的生长需要多种生长因子顺序的协调作用。
摘要
背景
:既往实验结果表明下颌前导能够使幼年期大鼠髁突发生改建,表现为促进髁突组织生长。但下颌前导对成年期大鼠髁突改建影响以及在髁突软骨超微结构等方面与幼年期大鼠的差异仍是研究的关键。
目的:观察成年期大鼠与幼年期大鼠在下颌持续前导作用下髁突软骨的改建差异以及超微结构的变化。
方法:30只4周龄的SD大鼠和30只9周龄的SD大鼠建立下颌前导模型。分别随机分为是实验组(15只)和对照组(15只)。实验组坚持佩戴上颌斜面导板,对照组不需要佩戴该装置,分别在第3,7,14,21,30天处死动物并取材,免疫组织化学染色检测血管内皮生长因子在髁突中的表达及分布,Micro CT分析髁突骨质的变化。
结果与结论:①与对照组相比,实验组成年期大鼠与幼年期大鼠血管内皮生长因子阳性细胞率及灰度值在第7天开始增多,成年期大鼠实验组30 d时达到最高值(P < 0.01);幼年期大鼠实验组21 d时达到最大值(P < 0.01),30 d时灰度值较21 d时减小,但仍大于对照组;②与对照组相比,Micro-CT显示实验组的新生骨和骨小梁厚度、骨小梁数量和分离度随时间延长而增加;③在下颌持续前导下,成年期与幼年期大鼠髁突软骨出现增生性改建,并存在血管内皮生长因子的高表达,但是幼年期大鼠更易发生适应性改建。

中国组织工程研究杂志出版内容重点:组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松组织工程
ORCID: 0000-0001-9722-9247(武敏)

关键词: 下颌, 错合牙, 血管内皮生长因子, 组织构建

Abstract:

BACKGROUND: Previous experimental results have shown that mandibular advancement can remodel the condylar process in growing rats, which is shown to promote the growth of condylar tissue. However, the influence of mandibular advancement on condylar remodeling and ultrastructure of condylar cartilage in adult rats different from those in growing rats are still a key issue.
OBJECTIVE: To observe the condylar remodeling and ultrastructural variations in the mandibular condylar cartilage in adult and growing rats undergoing mandibular advancement.
METHODS: Thirty 9-week-old male Sprague-Dawley rats and thirty 4-week-old male Sprague-Dawley rats were randomly divided into experimental and control groups with 15 adult rats and 15 growing rats in each group. Rats in the experimental group were subjected to wearing mandibular advancement splints. Rats were sacrificed on days 3, 7, 14, 21, and 30. Sections from the condyles were cut, and vascular endothelial growth factor expression in the condylar cartilage was examined through immunohistochemical analysis. These samples were also observed under Micro-CT. 
RESULTS AND CONCLUSION: Compared with the control group, the number of vascular endothelial growth factor positive cells in the condylar cartilage and the gray value gradually increased in the experimental group on day 7 of the intervention: for the adult rats, the positive cell number and gray value were at the maximum level on day 30 (P < 0.01), while for the growing rats, the highest number of positive cells and gray value appeared on day 21 (P < 0.01), and the gray value on day 30 was lower than that on day 21 but still higher than that in the control group. Micro-CT revealed that the trabecula and the newly formed bone in the experimental group gradually thickened, and the number and separation of trabeculae increased with time. To conclude, both adult and growing rats display hyperplastic remodeling in the condyle with the presence of high expression of vascular endothelial growth factor under continuous mandibular advancement. However, the adaptive remodeling is earlier in the growing rats than in the adult rats.

中国组织工程研究杂志出版内容重点:组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松组织工程

Key words: Mandible, Malocclusion, Angle Class II, Vascular Endothelial Growth Factors, Tissue Engineering

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