Statement of problem

Manufacturers of the recently introduced nanofilled bis-acryl composite resins no longer recommend polishing to produce interim restorations; however, whether this advice is appropriate is unclear.

Purpose

The purpose of this in vitro study was to evaluate the effect of the type of interim resin material, polishing procedure, and artificial staining on surface roughness, gloss, and color.

Material and methods

Disk-shaped specimens were prepared from 1 unfilled acrylic resin (Duralay) and 3 bis-acryl composite resins (Structur 3—nanofilled, Systemp C&B—microhybrid, Proviplast—microhybrid). The specimens of each material were assigned to 2 subgroups (n=15): polished and unpolished. Surface roughness (Ra—μm), gloss (UB), and color (ΔE) were analyzed at baseline and after 14 days of artificial staining. Roughness and gloss data were separately analyzed by 3-way ANOVA and color by 2-way ANOVA, followed by the post hoc Tukey test (α=.05).

Results

The baseline roughness of all materials was significantly reduced by the polishing procedure, whereas the baseline gloss was increased (P<.001). Only the unpolished Proviplast had a significant increase in Ra values after aging. Structur 3 had higher gloss than Systemp C&B and Proviplast. The acrylic resin had the lowest color change after staining.

Conclusions

The polishing procedure produced smother and glossier surfaces for all the materials tested. The nanofilled bis-acryl composite resin material had higher gloss than the microhybrid bis-acryls tested, but it was not different from the acrylic resin. The 14 days of artificial staining did not promote significant changes in Ra or gloss values, except for Ra in the unpolished Proviplast subgroup, indicating excellent performance of the materials. The acrylic resin had the highest color stability.

中文翻译：

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纳米填充的双丙烯酸复合树脂材料：是否需要抛光？

问题陈述

最近推出的纳米填充双丙烯酸复合树脂的制造商不再建议抛光以产生临时修复体。但是，尚不清楚该建议是否合适。

目的

这项体外研究的目的是评估临时树脂材料的类型，抛光步骤和人工染色对表面粗糙度，光泽和颜色的影响。

材料与方法

由1种未填充的丙烯酸树脂（Duralay）和3种双丙烯酸复合树脂（Structur 3-纳米填充，Systemp C＆B-微混合，Proviplast-微混合）制备圆盘状样品。每种材料的标本被分为2个子组（n = 15）：抛光和未抛光。在基线和人工染色14天后分析表面粗糙度（Ra-μm），光泽度（UB）和颜色（ΔE）。粗糙度和光泽度数据分别通过3通ANOVA和2通ANOVA进行颜色分析，然后进行事后Tukey测试（α= .05）。

结果

通过抛光程序，所有材料的基线粗糙度均显着降低，而基线光泽度则有所提高（P < .001）。老化后，只有未抛光的Proviplast的Ra值显着增加。Structur 3的光泽度高于Systemp C＆B和Proviplast。丙烯酸树脂在染色后具有最低的颜色变化。

结论

抛光程序使所有测试材料产生更光滑的表面。纳米填充的双丙烯酸复合树脂材料的光泽度高于所测试的微杂双丙烯酸树脂，但与丙烯酸树脂没有区别。14天的人工染色并没有促进Ra或光泽度值的显着变化，除了未抛光的Proviplast亚组中的Ra以外，这表明材料具有出色的性能。丙烯酸树脂具有最高的颜色稳定性。