Hamza Tamer A, Johnston William M, Schricker Scott R
Assistant Professor and Head, Crowns and Fixed Prosthetic Department, Faculty of Dental Medicine, Al-Azhar University, Cairo Egypt.
Professor, Division of Restorative and Prosthetic Dentistry, The Ohio State University, Columbus, Ohio.
J Prosthet Dent. 2014 Aug;112(2):228-34. doi: 10.1016/j.prosdent.2014.01.008. Epub 2014 Mar 28.
Polyhedral silsesquioxane (POSS) nanofillers can reinforce interim materials. However, the interaction between the POSS and the brand and its effect on color are unknown.
The purpose of this study was to determine the effect on the flexural strength, color, and color stability of 4 commercially available interim materials modified with 1 wt% POSS.
Four commercial interim resin materials were used in this study: Jet, Trim, Temphase, and Protemp. The flexural strength of the interim materials was measured with and without 1 wt% POSS with an Instron universal testing machine. The color of the interim material and the material with 1 wt% POSS were evaluated, followed by the evaluation of the color change after coffee staining. The data were analyzed with a 2-way analysis of variance (ANOVA) followed by the Tukey standardized range test (HSD) to determine statistical significance (α=.05).
POSS enhanced the flexural strength of Protemp and Trim but had no effect on Temphase and Jet. POSS had a significant affect on the color (L*, a*, b*), but only 2 pairwise differences (in L* Trim versus Trim POSS and in a* Temphase versus Temphase POSS) were detected. The effect of POSS on color change after coffee staining was minimal. POSS only had a significant effect on ΔL, and only 1 pairwise difference was detected (Temphase versus Temphase POSS). The collapsed means revealed significant differences in color change among brands after coffee staining.
The reinforcement effect of POSS on flexural strength depended on the brand, suggesting that the chemistry of the resin affects the ability of POSS to modify mechanical properties. POSS affected the initial color of the interim materials but had little effect on the color change after coffee staining.
多面体倍半硅氧烷（POSS）纳米填料可增强临时材料。然而，POSS与品牌之间的相互作用及其对颜色的影响尚不清楚。
本研究的目的是确定1 wt% POSS改性对4种市售临时材料的弯曲强度、颜色和颜色稳定性的影响。
本研究使用了4种商用临时树脂材料：Jet、Trim、Temphase和Protemp。使用Instron万能试验机测量添加和不添加1 wt% POSS时临时材料的弯曲强度。对临时材料和添加1 wt% POSS的材料的颜色进行评估，然后评估咖啡染色后的颜色变化。数据采用双向方差分析（ANOVA），随后进行Tukey标准化范围检验（HSD）以确定统计学显著性（α = 0.05）。
POSS提高了Protemp和Trim的弯曲强度，但对Temphase和Jet没有影响。POSS对颜色（L*、a*、b*）有显著影响，但仅检测到2对差异（L方面Trim与Trim POSS，a方面Temphase与Temphase POSS）。POSS对咖啡染色后颜色变化的影响最小。POSS仅对ΔL有显著影响，仅检测到1对差异（Temphase与Temphase POSS）。汇总均值显示咖啡染色后各品牌之间颜色变化存在显著差异。
POSS对弯曲强度的增强作用取决于品牌，这表明树脂的化学性质会影响POSS改变机械性能的能力。POSS影响临时材料的初始颜色，但对咖啡染色后的颜色变化影响不大。
