Fatigue and fracture behavior of radicular dentin substrate: prevention of tooth fracture

根基牙本质基质的疲劳和断裂行为：预防牙齿断裂

• 批准号: 21791950
• 负责人: INOUE Toshiko
• 金额: $ 2.5万
• 依托单位: Showa University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21791950/
• 关键词: 歯; 歯質; 象牙質; 強度特性; 疲労強さ; 引張強さ; 歯根; 人歯

The purpose of this study was to compare the fatigue and tensile strengths of radicular dentin. Dentin slabs were prepared along the radicular tooth and trimmed into dumbbell-shaped specimens. Subsequently, fatigue and tensile tests were performed. The staircase method was employed to determine fatigue strength and its standard deviation. Mean fatigue strength and tensile strength were 44.3 ± 5.0 and 84.4 ± 8.3 MPa, respectively. The fatigue strength of radicular dentin was only approximately one half of the tensile strength. Additionally, fracture surfaces were observed by scanning electron microscopy. In engineering materials, fatigue failures are often facilitated by cyclic crack extension, which is identified by a series of self-similar inflections on the fracture surface regarded as “striations”. We confirmed that striations spacing on fracture surfaces of radicular dentin ranged from approximately 3 to 10 μm.

本研究的目的是比较根面牙本质的疲劳强度和抗拉强度。沿牙根沿着制备牙本质板，并修剪成哑铃形标本。随后，进行疲劳和拉伸试验。采用阶梯法确定疲劳强度及其标准差。平均疲劳强度和拉伸强度分别为44.3 ± 5.0和84.4 ± 8.3 MPa。根面牙本质的疲劳强度约为抗拉强度的一半。此外，通过扫描电子显微镜观察断裂表面。在工程材料中，疲劳失效往往是由循环裂纹扩展，这是确定了一系列的自相似曲折断裂表面上被视为“条纹”。我们证实根面牙本质断裂面上的条纹间距约为3 ~ 10 μm。

项目成果

Aging and three dimensional changes of bone structure in rats

大鼠衰老及骨结构三维变化

• 作者: Inoue T;Amano H;Nishimura F;Miyazaki T.
• 通讯作者: Miyazaki T.

Fatigue and tensile properties of radicular dentin substrate

根基牙本质基质的疲劳和拉伸性能

• DOI: 10.1016/j.jbiomech.2010.11.025
• 发表时间: 2011
• 期刊: Journal of Biomechanics
• 影响因子: 2.4
• 作者: Inoue T;Nishimura F;Debari K;Kou K;Miyazaki T
• 通讯作者: Miyazaki T

CCIラットにおける下顎骨の形態異常に関する研究

CCI大鼠下颌形态异常的研究

• 发表时间: 2011
• 作者: Inoue T;Yamamoto M;Saito M;Debari K;Kou K;Nishimura F;Miyazaki T;天野均,井上利志子,龍家圭,田中政巳,柴田俊一,山田庄司;天野 均,井上利志子,田中政巳,小林真一,山田庄司
• 通讯作者: 天野 均,井上利志子,田中政巳,小林真一,山田庄司

Comparison of nanohardness between coronal and radicular intertubular dentin

• DOI: 10.4012/dmj.28.295
• 发表时间: 2009-05-01
• 期刊: DENTAL MATERIALS JOURNAL
• 影响因子: 2.5
• 作者: Inoue, Toshiko;Saito, Makoto;Miyazaki, Takashi
• 通讯作者: Miyazaki, Takashi

Chemical analysis of coronal and radicular dentin using Fourier transform infrared spectroscopy

使用傅里叶变换红外光谱法对冠状牙本质和根牙本质进行化学分析

• 发表时间: 2009
• 期刊: Dental Medicine Research
• 作者: Inoue T;Yamamoto M;Saito M;Debari K;Kou K;Nishimura F;Miyazaki T
• 通讯作者: Miyazaki T