Objective

This study is focused on testing experimental rapid prototyping materials for occlusal splints made from Urethandimethacrylate (UDMA) and Urethanmethacrylate (UMA).

Methods

Materials were mixed from UDMA and UMA in ratios of 1.0:0.0, 0.75:0.25, 0.5:0.5, 0.25:0.75 and 0.0:1.0. Specimens were printed using digital light processing (DLP). After post-processing, the specimens underwent testing on flexural strength, modulus of elasticity, hardness, wear behavior, surface roughness, gloss and color stability. All tests were performed after 24 h (baseline) and 10 days of water storage (aging). Splints underwent cyclic pull-off and insertion testing, which was alongside simulated using finite element analysis.

Results

The mechanical properties were significantly influenced by changes in the UDMA:UMA ratio. Statistical analysis revealed that increased amounts of UMA correlated with a decrease in flexural strength (92.0 to 30.7 MPa), modulus of elasticity (2.4 to 0.6 GPa), hardness (155.1 to 102.0 N/mm²) and wear resistance (−1394.9 to −1742.1 μm). Materials with higher amounts of UMA were also more likely to be influenced by water storage. Specimens with 75% and 100% UMA content were partly not analyzable due to soft consistency.

Optical properties showed only minor influence from UMA content and aging. Differences in surface roughness (3.9 to 2.4 μm) and color stability were insignificant. Gloss was partly influenced by the UDMA:UMA ratio and water storage.

Mean survival rates for cyclic pull-off and insertion testing ranged from 2537 to 23,857 cycles. A correlation between the amount of UMA and survival rates was observed.

Significance

The addition of up to 25% UMA showed promising results, complying with clinical standards and delivering acceptable results in the cyclic pull-off and insertion test. Further investigation on increments between 0 and 25% UMA could help to find an optimum.

中文翻译：

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研究新型聚氨酯二甲基丙烯酸酯 (UDMA) 和聚氨酯甲基丙烯酸酯 (UMA) 基快速成型材料的机械和光学性能

客观的

本研究的重点是测试由氨基甲酸乙酯 (UDMA) 和氨基甲酸乙酯 (UMA) 制成的咬合夹板的实验性快速原型材料。

方法

由 UDMA 和 UMA 以 1.0:0.0、0.75:0.25、0.5:0.5、0.25:0.75 和 0.0:1.0 的比例混合材料。使用数字光处理 (DLP) 打印样本。后处理后的试样进行抗弯强度、弹性模量、硬度、磨损行为、表面粗糙度、光泽度和颜色稳定性测试。所有测试均在 24 小时（基线）和 10 天的水储存（老化）后进行。夹板经过循环拉拔和插入测试，同时使用有限元分析进行模拟。

结果

UDMA:UMA 比率的变化显着影响了机械性能。统计分析显示，增加的 UMA 量与弯曲强度（92.0 至 30.7 MPa）、弹性模量（2.4 至 0.6 GPa）、硬度（155.1 至 102.0 N/mm ²）和耐磨性（-1394.9 至 -）的降低相关1742.1 微米）。UMA 含量较高的材料也更可能受到储水的影响。由于软稠度，具有 75% 和 100% UMA 含量的样本部分无法分析。

UMA 含量和老化对光学性能的影响很小。表面粗糙度（3.9 至 2.4 μm）和颜色稳定性的差异微不足道。光泽部分受 UDMA:UMA 比率和储水量的影响。

循环拔出和插入测试的平均存活率为 2537 到 23,857 个周期。观察到UMA的量与存活率之间的相关性。

意义

添加高达 25% 的 UMA 显示出有希望的结果，符合临床标准并在循环拉拔和插入测试中提供可接受的结果。进一步研究 0 到 25% UMA 之间的增量可能有助于找到最佳值。