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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >Degree of conversion and mechanical properties of a BisGMA:TEGDMA composite as a function of the applied radiant exposure.
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Degree of conversion and mechanical properties of a BisGMA:TEGDMA composite as a function of the applied radiant exposure.

机译：BisGMA：TEGDMA复合材料的转化度和机械性能与所施加的辐射暴露的关系。

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OBJECTIVE: Verify the influence of radiant exposure (H) on composite degree of conversion (DC) and mechanical properties. METHODS: Composite was photoactivated with 3, 6, 12, 24, or 48 J/cm(2). Properties were measured after 48-h dry storage at room temperature. DC was determined on the flat surfaces of 6 mm x 2 mm disk-shaped specimens using FTIR. Flexural strength (FS) and modulus (FM) were accessed by three-point bending. Knoop microhardness number (KHN) was measured on fragments of FS specimens. Data were analyzed by one-way ANOVA/Tukey test, Student's t-test, and regression analysis. RESULTS: DC/top between 6 and 12 J/cm(2) and between 24 and 48 J/cm(2) were not statistically different. No differences between DC/top and bottom were detected. DC/bottom, FM, and KHN/top showed significant differences among all H levels. FS did not vary between 12 and 24 J/cm(2) and between 24 and 48 J/cm(2). KHN/bottom at 3 and 6 J/cm(2) was similar. KHN between top and bottom was different up to 12 J/cm(2). Regression analyses having H as independent variable showed a plateau region above 24 J/cm(2). KHN increased exponentially (top) or linearly (bottom) with DC. FS and FM increased almost linearly with DC/bottom up to 55% conversion. CONCLUSIONS: DC and mechanical properties increased with radiant exposure. Variables leveled off at high H levels.
机译：目的：验证辐射暴露（H）对复合转化率（DC）和机械性能的影响。方法：用3、6、12、24或48 J / cm（2）对复合材料进行光活化。在室温下干燥48小时后测量性能。使用FTIR在6mm×2mm盘状样品的平坦表面上测定DC。通过三点弯曲获得抗弯强度（FS）和模量（FM）。努氏显微硬度值（KHN）在FS标本的碎片上测量。通过单向方差分析/ Tukey检验，Student's t检验和回归分析对数据进行分析。结果：DC /顶部之间6至12 J / cm（2）和24至48 J / cm（2）之间没有统计学差异。未检测到DC /顶部和底部之间的差异。 DC /底部，FM和KHN /顶部在所有H水平之间显示出显着差异。 FS在12至24 J / cm（2）和24至48 J / cm（2）之间没有变化。 KHN /底部分别为3和6 J / cm（2）。顶部和底部之间的KHN最高可达12 J / cm（2）。以H为自变量的回归分析显示高于24 J / cm（2）的平稳区域。 KHN与DC呈指数增长（顶部）或线性增长（底部）。 FS和FM随着DC /底部的转换几乎线性增长，最高达到55％。结论：DC和机械性能随辐射暴露而增加。变量在高H水平下趋于平稳。

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