Objective

To determine the mechanical properties of a newly-developed CAD/CAM resin composite block and compare with other resin composite blocks and a polymer-infiltrated ceramic block.

Methods

Experimental composite block was formulated by our proprietary resin and filler technologies and cured via Hot Isostatic Pressing (HIP). Bar-shaped specimens (1 × 4×12 − 13 mm, n = 10) for flexural strength, flexural modulus and modulus of resilience were sectioned from block materials and measured in accordance to modified ISO-6872. Cylinder specimens for compressive strength (2 × 4 mm, n = 8) and for diametral tensile strength (6 × 3 mm, n = 8) were milled from the block materials and tested according to ASTM-D695 and ANSI/ADA-Specification #27, respectively. Block specimens (5 mm, n = 3) for Vickers hardness were polished and measured for five indentations on each specimen. The data was analyzed by one-way ANOVA and post-hoc Tukey tests (p ≤ 0.05).

Results

Experimental composite block showed higher or significantly higher flexural strength, flexural modulus, modulus of resilience, compressive strength, diametral tensile strength and Vickers hardness than the other commercially available block materials except Vita Enamic for flexural modulus and hardness and Cerasmart for modulus of resilience. Some positive correlations were observed among the different mechanical properties.

Significance

New composite block exhibited higher mechanical properties as compared to commercially available composite block materials. Superior mechanical properties for resin composite block materials were obtained by composite and curing processing technologies. Resin composite blocks with higher mechanical properties are good options for the fabrication of CAD/CAM indirect restorations.

中文翻译：

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一种新型高力学性能的CAD/CAM树脂复合砌块

客观的

确定新开发的 CAD/CAM 树脂复合砌块的力学性能，并与其他树脂复合砌块和聚合物渗透陶瓷砌块进行比较。

方法

实验性复合砌块采用我们专有的树脂和填料技术配制而成，并通过热等静压 (HIP) 固化。弯曲强度、弯曲模量和回弹模量的棒状试样 (1 × 4 × 12 − 13 mm, n = 10) 从块状材料上切下，并根据修改后的 ISO-6872 进行测量。压缩强度（2 × 4 毫米，n = 8）和径向抗拉强度（6 × 3 毫米，n = 8）的圆柱体试样由块体材料铣削而成，并根据 ASTM-D695 和 ANSI/ADA-Specification # 进行测试27 个。对维氏硬度块试样 (5 mm, n = 3) 进行抛光并测量每个试样上的五个压痕。数据通过单向方差分析和事后 Tukey 检验（p ≤ 0.05）进行分析。

结果

实验复合砌块的弯曲强度、弯曲模量、回弹模量、压缩强度、径向拉伸强度和维氏硬度均高于或显着高于其他市售砌块材料，除了 Vita Enamic 的弯曲模量和硬度以及 Cerasmart 的回弹模量。在不同的机械性能之间观察到一些正相关。

意义

与市售复合砌块材料相比，新型复合砌块表现出更高的机械性能。通过复合和固化加工技术，获得了树脂复合砌块材料优越的力学性能。具有较高机械性能的树脂复合块是制作 CAD/CAM 间接修复体的良好选择。