[1]李祉欣,张凯亮,李瑞萍,等.正畸牵引力对牙釉质层微观结构的影响[J].南方医科大学学报,2020,(08):1165-1171.
 Effect of orthodontic traction on the microstructure of dental enamel[J].Journal of Southern Medical University,2020,(08):1165-1171.
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正畸牵引力对牙釉质层微观结构的影响()
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《南方医科大学学报》[ISSN:1673-4254/CN:44-1627/R]

卷:
期数:
2020年08期
页码:
1165-1171
栏目:
出版日期:
2020-07-30

文章信息/Info

Title:
Effect of orthodontic traction on the microstructure of dental enamel
作者:
李祉欣张凯亮李瑞萍许龄丹何璐璐庞晓婵卢纪元曹宝成张宝平
关键词:
正畸力牙釉质层微结构釉质脱矿
Keywords:
orthodontic force enamel layer microstructure enamel demineralization
文献标志码:
A
摘要:
目的 探讨正畸牵引力对牙釉质层微观结构的影响,为口腔正畸临床实践提供力学依据。方法 选取48颗离体前磨牙,随机分为6组,8颗/组。A组为空白对照组,仅使用光固化粘接法粘接正畸托槽,不加任何力。B1、B2、B3组均使用光固化粘接法粘接正畸托槽,分别加载50 g力持续6月,200 g力持续6月和200 g力持续1月。C1、C2组分别使用光固化粘接和化学固化粘接技术粘接托槽。对试样组的牙齿进行不脱钙环氧树脂包埋,经硬组织切片机切片后,使用扫描电子显微镜(SEM)、原子力显微镜(AFM)及能谱仪(EDS)对断裂界面形态和元素组成进行分析。结果 实验组离体牙相比对照组粘合剂残余指数较大,SEM观察到牙釉质表面出现微裂纹和空隙结构,AFM显示不同粘接方式釉质表面形成与打磨方向呈角度的微裂纹。实验组随托槽上加的力值增大,牙釉质界面微裂隙越多。界面粗糙度方面A与C2组具有差异(P<0.05);峰-谷距离方面,A、C1和C2组三者具 有显著差异(P<0.05)。结论 正畸牵引力改变了正常牙釉质层的微观结构。
Abstract:
Objective To investigate the effect of orthodontic traction on the microstructure of dental enamel. Methods Forty-eight isolated premolars were randomly divided into 6 groups (n=8), including Group A (blank control group), in which the teeth were bonded with the orthodontic brackets without any loading force; Groups B1, B2, and B3 where the teeth were bonded with the orthodontic brackets using clinical adhesives and loaded with 50 g force for 6 months, 200 g force for 6 months, and 200 g force for 1 month, respectively; and Groups C1 and C2, where the teeth were bonded with straight wire brackets using light curing bonding and chemical curing bonding techniques, respectively. All the teeth were embedded with non-decalcified epoxy resin. Scanning electron microscope (SEM), atomic force microscope (AFM), and energy spectrometer (EDS) were used to analyze interface morphology and elemental composition of the teeth sliced with a hard tissue microtome. Results Compared with those in Group A, the teeth in the other 5 groups showed increased adhesive residue index with microcracks and void structures on the enamel surface under SEM; AFM revealed microcracks on the enamel surface with angles to the grinding direction. A larger loading force on the bracket resulted in more microcracks on the enamel interface. The interface roughness differed significantly between Groups A and C2, and the peak-to-valley distance differed significantly between Groups A, C, and C2. Conclusion Orthodontic traction can cause changes in the microstructure of normal dental enamel.
更新日期/Last Update: 2020-07-29