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首页> 外文期刊>Journal of Lasers in Medical Sciences >Effects of 810nm Diode Laser Irradiation on Flexural Strength of Dentin: An Invitro Study
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Effects of 810nm Diode Laser Irradiation on Flexural Strength of Dentin: An Invitro Study

机译：810nm二极管激光辐照对牙本质抗弯强度的影响：一项体外研究

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INTRODUCTION: Thermal changes in laser assisted root canal therapy with the use of diode laser can predispose tooth structure to the fracture. This study evaluated the changes in flexural strength of dentin blocks after diode laser irradiations (810 nm). METHODS: A total of 60 dentinal blocks were prepared from freshly extracted teeth in three different thicknesses (300, 500 and 1000μm) and 20 sections in each of these thicknesses were divided randomly to the test and control groups. Samples in the test groups were irradiated at 2W power setting by scanning movement of 2mm/s of diode laser, and the controls were stored in normal saline. The flexural strength of samples was evaluated by UTM (Universal Testing Machine). Data analysis was done with the SPSS Software 11.5. RESULTS: Samples of 300μ had the lowest flexural strength (mean: 71/65 mpa) followed by 500 (116.64 mpa) and 1000μ (217.56 mpa). Statistical analyses showed that after laser irradiation, the flextural strength in the samples of 300μ was significantly lower than that in the other groups (500μ, 1000μ) (P= 0.017). CONCLUSION: Within the limits of this study, diode laser irradiation in laser assisted root canal therapy has no significant effect on flexural strength of root dentinal walls with the thickness of more than 500μ. Although in areas with critical dentinal width (≤300μ), this setting can jeopardize root micromechanical properties and predispose tooth to the root fracture.
机译：简介：使用二极管激光器的激光辅助的根管治疗中的热变化可能会使牙齿结构易于骨折。这项研究评估了二极管激光照射（810 nm）后牙本质块抗弯强度的变化。方法：从新鲜拔出的牙齿中制备三种不同厚度（300、500和1000μm）的60个牙本质块，将每种厚度的20个切片随机分为测试组和对照组。通过扫描2mm / s二极管激光器的运动，以2W的功率设置照射测试组中的样品，并将对照保存在生理盐水中。样品的弯曲强度通过UTM（通用试验机）进行评价。数据分析是使用SPSS Software 11.5完成的。结果：300μm样品的弯曲强度最低（平均：71/65 mpa），其次是500μm（116.64 mpa）和1000μm（217.56 mpa）。统计分析表明，激光辐照后，300μs样品的抗折强度明显低于其他组（500μ，1000μ）（P = 0.017）。结论：在本研究的范围内，激光辅助根管治疗中的二极管激光辐照对厚度超过500μ的牙根壁的抗弯强度没有显着影响。尽管在牙本质临界宽度（≤300μ）的区域中，此设置可能会损害牙根的微机械性能，并使牙齿容易发生牙根骨折。

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