Objective

This study investigated the handling and surface characteristics of universal resin composites and determined the interrelations among the composites’ handling, mechanical, and physical properties.

Methods

Five recently introduced universal resin composites were tested. Twelve specimens per material were used to measure the stiffness and stickiness (handling properties) of the resin composite pastes. Additionally, surface properties (Knoop hardness number [KHN], surface roughness [Sa], surface gloss [SG], water contact angle [CA], and surface free energy [SFE]) of cured resin composites were determined in 12 specimens per material immediately after preparation (baseline) and after subjection to thermal cycles (TCs).

Results

Handling and surface properties of the resin composites were material dependent. All the resin composites showed significantly lower KHN in the post-TC subgroups than that in the baseline subgroups. However, the influence of TC on the other surface properties was dependent on the material used. Some resin composites did not indicate any significant differences in Sa, SG, or CA between the baseline and post-TC groups.

Significance

Although the resin composites in the baseline groups presented with different handling and surface properties, the surface properties of most of the composites were significantly affected by TC. Extremely strong positive or negative correlations were observed between stiffness and stickiness, KHN and Sa, KHN and SG, Sa and SG, and CA and SFE. Most correlations between the handling and surface properties were weak. Therefore, the selection of resin composites in clinical situations should be based on comprehensive consideration of their properties.

中文翻译：

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通用树脂复合材料的处理性能和表面特性

客观的

本研究调查了通用树脂复合材料的处理和表面特性，并确定了复合材料处理、机械和物理性能之间的相互关系。

方法

对五种最近推出的通用树脂复合材料进行了测试。每种材料使用 12 个试样来测量树脂复合浆料的刚度和粘性（处理性能）。此外，在每种材料的 12 个样品中测定固化树脂复合材料的表面特性（努普硬度值 [KHN]、表面粗糙度 [ Sa ]、表面光泽度 [SG]、水接触角 [CA] 和表面自由能 [SFE]）在制备（基线）和热循环 (TC) 后立即进行。

结果

树脂复合材料的处理和表面特性取决于材料。所有树脂复合材料在 TC 后亚组中的 KHN 均显着低于基线亚组。然而，TC 对其他表面特性的影响取决于所使用的材料。一些树脂复合材料在基线和 TC 后组之间的Sa、SG 或 CA没有任何显着差异。

意义

尽管基线组中的树脂复合材料具有不同的处理和表面性能，但大多数复合材料的表面性能受到 TC 的显着影响。在刚度和粘性、KHN 和Sa、KHN 和 SG、Sa和 SG 以及 CA 和 SFE之间观察到极强的正相关或负相关。处理和表面特性之间的大多数相关性都很弱。因此，在临床选用树脂复合材料时，应综合考虑其性能。