| 李萍萍,吴奇.酸蚀对人磨牙抗压强度影响的体外研究[J].口腔材料器械杂志,2020,29(3):133-137. |
| 酸蚀对人磨牙抗压强度影响的体外研究 |
| In vitro study of the effect of acid etching on compressive strength of human molars |
| 投稿时间：2020-06-13 修订日期：2020-07-16 |
| DOI：10.11752/j.kqcl.2020.03.03 |
| 中文关键词: 人磨牙 酸蚀 抗压强度 数值模拟 |
| 英文关键词:Molar Acid etching Compressive strength Numerical simulation |
| 基金项目:北京工业大学校基础研究基金（编号：546319539），北京市朝阳区博士后科研经费资助项目（编号：Z2019413） |
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| 中文摘要: |
| 目的 研究饮食引起的酸性口腔环境对人磨牙抗压强度的影响，评估咬合坚硬食物应力下的脆性折断风险，结合体外压缩强度试验和数值计算进行定量评估。方法 采用乙酸水溶液对尺寸差异较小的人磨牙进行体外等效酸蚀处理，分无酸蚀、轻度、中度和重度酸蚀组。对全部牙体进行压缩强度试验，建立有限元模型分析断裂破坏过程和规律。结果 4组牙体破坏形式相似，均为无屈服阶段的脆性断裂。在无酸蚀组出现最大破坏载荷为2.79 kN，在重度酸蚀组出现最小破坏载荷为1.30 kN。有限元分析结果表明：牙体破坏时最大与最小应力分别为289 MPa和141 MPa。本研究等效重度酸蚀体外实验表明磨牙强度下降53.4%。数值模拟结果预测，当垂直牙体咬合受力时，符合几何突变处出现最大应力集中的规律。结论 酸蚀对牙体抗压强度有显著影响，长期酸蚀在咬合坚硬食物条件下，存在局部应力集中导致的脆断风险。 |
| 英文摘要: |
| Objective The aim of this study was to investigate the diet-mediated acid oral environment on the mechanical properties of human teeth, to evaluate the risk of brittle fracture under stress caused by biting hard food, and quantitatively determine the impact of acid corrosion on the damage degree of human teeth based on compressive strength numerical calculation. Methods Human molars with small difference in sizes were divided into four groups with different ratios of acetic acid solution. Compression tests were carried out on all of the teeth. A finite element model was established to analyze the fracture process. Results Failure modes of the four groups were similar, all of them were brittle fracture without yield stage. The maximum damage load 2.79 kN was found in the non-acid group and the minimum damage load 1.3 kN was found in the severe acid group. The results of finite element simulation showed that the maximum and minimum stresses were 289 MPa and 141 MPa respectively, the strength decreased 53.4%. Conclusion Acid etching has a significant effect on the compressive strength of teeth. Under the acid condition of hard food biting for a long time, there is a risk of local stress concentration and brittle fracture. |
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