中国组织工程研究 ›› 2022, Vol. 26 ›› Issue (32): 5162-5166.doi: 10.12307/2022.1027

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

大鼠髁突软骨下骨骨微结构生长发育的特征

刘  纯1,贾  莹1,杨世榕1,丁  琪2,杨  桦1,陈  波3   

  1. 1贵州医科大学,贵州省贵阳市  550004;2贵州医科大学附属口腔医院正畸科,贵州省贵阳市  550004;3贵州中医药大学,贵州省贵阳市  550025
  • 收稿日期:2021-09-27 接受日期:2021-11-11 出版日期:2022-11-18 发布日期:2022-05-12
  • 通讯作者: 贾莹,教授,硕士生导师,贵州医科大学,贵州省贵阳市 550004
  • 作者简介:刘纯,女,1991年生,湖南省湘西州人,土家族,贵州医科大学在读硕士,医师,主要从事口腔正畸学研究。
  • 基金资助:
    国家自然科学基金(81860795),项目负责人:贾莹;贵州省科技计划项目(黔科合[2018]2754号),项目负责人:贾莹;贵阳市科技计划项目(筑科合同[2018]1-83号),项目负责人:杨桦

Characteristics of the growth, development and microarchitecture of condyle subchondral bone in rats

Liu Chun1, Jia Ying1, Yang Shirong1, Ding Qi2, Yang Hua1, Chen Bo3   

  1. 1Guizhou Medical University, Guiyang 550004, Guizhou Province, China; 2Department of Orthodontics, School of Stomatology, Guizhou Medical University, Guiyang 550004, Guizhou Province, China; 3Guizhou University of Traditional Chinese Medical, Guiyang 550025, Guizhou Province, China
  • Received:2021-09-27 Accepted:2021-11-11 Online:2022-11-18 Published:2022-05-12
  • Contact: Jia Ying, Professor, Master’s supervisor, Guizhou Medical University, Guiyang 550004, Guizhou Province, China
  • About author:Liu Chun, Master candidate, Physician, Guizhou Medical University, Guiyang 550004, Guizhou Province, China
  • Supported by:
    the National Natural Science Foundation of China, No. 81860795 (to JY); Guizhou Science and Technology Project, No. qkh [2018]2754 (to JY); Guiyang Science and Technology Project, No. Zhuke contract [2018]1-83 (to YH)

摘要:

文题释义:
髁突软骨下骨:是髁突骨改建与骨重塑的最终呈现区域,富含血管与神经,能够营养软骨,并且能够感受应力,在解剖结构上具有更为活跃的改建基础。
骨微结构:骨质变化多先以骨微结构改变表现出来。骨微结构主要通过成骨和破骨细胞的数量、骨小梁形态结构、骨胶原密度和胶原连接、骨小梁排列结构等的变化导致骨强度和骨量改变。

背景:髁突的生长发育是影响整个颞下颌关节健康的一个重要因素。髁突软骨下骨作为髁突骨改建与骨重塑的最终呈现区域,具有更为活跃的改建基础,而以往研究并未对髁突软骨下骨及其微观结构进行充分探讨。
目的:应用Micro CT观察大鼠髁突软骨下骨微结构及生长发育特点。
方法:24只3周龄SD大鼠雌雄各半,随机分为0月龄组、3月龄组、5月龄组和7月龄组,每组6只。麻醉处死后截取右侧下颌髁突,行Micro CT扫描,将髁突9宫格划分后,选取中部前、后段软骨下骨作为兴趣区域,检测骨微结构参数。
结果与结论:①雌鼠0-7个月之间多数参数发生了显著生长变化(P < 0.05);从3-5个月,骨面积密度、骨表面积和骨体积比例、骨小梁数目、连通性以及骨小梁连接密度发生了显著变化(P < 0.05),部分参数开始稳定;到7个月,只有骨体积分数和总孔隙率依然显示显著差异(P < 0.05);②雄鼠从0-7个月仅骨小梁模式因子、骨小梁分离度、结构模式指数以及连通性随时间生长变化不明显(P > 0.05);从3-5个月多数参数平稳变化(P > 0.05);生长至7月龄,骨面积密度、骨小梁数目、连通性及骨小梁厚度大幅改变(P < 0.05);③从3-7个月雌雄大鼠骨形态、骨小梁形态、骨小梁空间结构均发生显著变化,但雄性变化较雌性波动更大;④结果说明,髁突软骨下骨骨质致密,以板状骨为主;雌性髁突软骨下骨生长发育早于雄性,并且先于雄性进入生长平台期。

https://orcid.org/0000-0002-6044-4573 (刘纯)

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

关键词: 颞下颌关节, 髁突, 髁突软骨下骨, 骨微结构, 微计算机断层扫描技术, 生长发育, 大鼠

Abstract: BACKGROUND: The growth and development of the condyle is an important factor affecting the health of the temporomandibular joint. The condyle subchondral bone, as the final presentation area of condylar bone reconstruction and bone remodeling, has a more active basis for remodeling. However, previous studies have not fully explored the subchondral bone of the condyle and its microarchitecture.
OBJECTIVE: To study the microarchitecture, growth and development characteristics of rat condyle subchondral bone by Micro-CT. 
METHODS: Twenty-four Sprague-Dawley rats of both sexes, aged 3 weeks, were randomly divided into 0-month group, 3-month group, 5-month group, and 7-month group (6 rats per group). After execution under anesthesia, the right mandibular condyle of each rat was cut out for Micro-CT scans, in which the condyle was divided into nine grids, with the middle anterior and posterior subchondral bone as the regions of interest to detect the bone microstructure parameters.
RESULTS AND CONCLUSION: Most parameters of female rats changed significantly at the age from 0 to 7 months (P < 0.05). From 3 to 5 months of age, there were significant changes in bone mineral density, bone surface area to bone volume ratio, trabecular number, connectivity, and changes density (P < 0.05), and some parameters began to level off. By 7 months, only bone volume fraction and total porosity still showed significant differences (P < 0.05). For male rats aged from 0 to 7 months, only trabecular pattern factor, trabecular separation, structural model index, and connectivity changed insignificantly with time (P > 0.05). From 3 to 5 months of age, most parameters of male rats changed steadily (P > 0.05). For male rats at the age of 7 months, bone mineral density, trabecular number, connectivity, and trabecular thickness changed significantly (P < 0.05). From 3 to 7 months of age, there were significant changes in bone morphology, trabecular morphology and spatial structure of trabecular bone in male and female rats, but these changes in males were greater than those in females. The above results explain that the condyle subchondral bone is dense and dominated by the lamellar bone; and the condyle subchondral bone develops earlier and presents with a steady growth earlier in female rats than male rats. 

Key words: temporomandibular joint, condyle, condyle subchondral bone, bone microarchitecture, Micro-CT, growth and development, rat

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