Aim

The aim of this in vitro study was to assess the mechanical properties of five commercially available subtractive computer-aided design and computer-aided manufacturing (CAD-CAM) milled splint materials, as well as to compare them with conventional heat-polymerized and autopolymerizing resins used in the construction of conventional splints.

Material and methods

Five CAD-CAM milled (ProArt CAD Splint, Therapon Transpa, Temp Premium Flexible Transpa, Cast, and Aqua), one autopolymerizing (Palapress), and one heat-polymerized (Paladon 65) resin materials were evaluated. Flexural strength, E-modulus, Vickers hardness, fracture toughness, fracture work, water sorption, and water solubility were measured. Samples were evaluated after dry and water storage for 30 days at 37 °C. Data were collected and statistically analyzed.

Results

Under both storage circumstances, the flexural strength values of Paladon 65, Therapon Transpa, Temp Premium Flexible Transpa, and Aqua were statistically non-significant (P=0.055). The polycarbonate-based CAD-CAM material Temp Premium Flexible Transpa had the highest statistically significant values of the fracture toughness and fracture work (P<0.001). Moreover, it exhibited the lowest percentages of water sorption and water solubility among the investigated materials (P<0.001). All of the CAD-CAM materials exhibited dry elastic moduli greater than Palapress and lower than Paladon 65. One of the CAD-CAM materials, Cast, had the highest dry Vickers hardness value, which was non-significant when compared to Therapon Transpa (P=0.762).

Conclusion

CAD-CAM polycarbonate-based splint materials exhibit higher fracture toughness and fracture work as well as lower water sorption and solubility than polymethyl methacrylate-based ones. The mechanical characteristics of the assessed CAD-CAM milled splint materials were not typically superior to those of the conventional heat-polymerized resin. However, some of them outperformed the autopolymerizing acrylic resin in terms of flexural strength, surface microhardness, water sorption, and water solubility.

中文翻译：

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咬合夹板材料的表征：CAD-CAM 与传统树脂的对比

目的

这项体外研究的目的是评估五种市售减材计算机辅助设计和计算机辅助制造 (CAD-CAM) 研磨夹板材料的机械性能，并将它们与传统的热聚合和自聚合树脂进行比较用于制造传统夹板。

材料与方法

对五种 CAD-CAM 铣削材料（ProArt CAD 夹板、Therapon Transpa、Temp Premium Flexible Transpa、Cast 和 Aqua）、一种自聚合树脂材料（Palapress）和一种热聚合树脂材料（Paladon 65）进行了评估。测量了弯曲强度、弹性模量、维氏硬度、断裂韧性、断裂功、吸水性和水溶性。样品在 37°C 下干燥和水储存 30 天后进行评估。收集数据并进行统计分析。

结果

在两种储存情况下，Paladon 65、Therapon Transpa、Temp Premium Flexible Transpa 和 Aqua 的弯曲强度值在统计上均不显着（P = 0.055）。基于聚碳酸酯的 CAD-CAM 材料 Temp Premium Flexible Transpa 具有最高的断裂韧性和断裂功的统计显着值 ( P <0.001)。此外，它在所研究的材料中表现出最低的吸水率和水溶性百分比（P <0.001）。所有 CAD-CAM 材料的干弹性模量均大于 Palapress 且低于 Paladon 65。其中一种 CAD-CAM 材料 Cast 具有最高的干维氏硬度值，与 Therapon Transpa 相比不显着（P=0.762）。

结论

CAD-CAM 聚碳酸酯基夹板材料比聚甲基丙烯酸甲酯基夹板材料具有更高的断裂韧性和断裂功，以及更低的吸水率和溶解度。评估的 CAD-CAM 研磨夹板材料的机械特性通常并不优于传统热聚合树脂的机械特性。然而，它们中的一些在弯曲强度、表面显微硬度、吸水性和水溶性方面优于自聚合丙烯酸树脂。