Cavalcante Larissa M, Masouras Konstantinos, Watts David C, Pimenta Luiz A, Silikas Nick
Department of Restorative Dentistry, The University of Passo Fundo, School of Dentistry, Brazil.
Am J Dent. 2009 Feb;22(1):60-4.
To investigate the effect of filler-particle size of experimental and commercial resin composites, undergoing toothbrush abrasion, on three surface properties: surface roughness (SR), surface gloss (G) and color stability (CS).
Four model (Ivoclar/Vivadent) and one commercial resin composite (Tokuyama) with varying filler-size from 100-1000 nm were examined. Six discs (10 mm x 2 mm) from each product were prepared and mechanically polished. The samples were then submitted to 20,000 brushing strokes in a toothbrush abrasion machine. SR parameters (Ra, Rt and RSm), G, and CS were measured before and after toothbrush abrasion. Changes in SR and G were analyzed by 2-way ANOVA, with Bonferroni post hoc test. CS values were submitted to one-way ANOVA and Bonferroni post hoc test (alpha=0.05).
Initial G values ranged between 73-87 gloss units (GU) and were reduced after toothbrush abrasion to a range of 8-64 GU. Toothbrush abrasion resulted in significant modifications in SR and G amongst the materials tested, attributed to filler sizes. There was statistically significant difference in color (delta E* ranged from 0.38-0.88). Filler size did not affect color stability. Toothbrush abrasion resulted in rougher and matte surfaces for all materials tested. Although the individual differences in surface roughness among filler sizes were not always significant, the correlation showed a trend that larger filler sizes resulted in higher surface roughness after abrasion for the SR parameters Ra and Rt (r = 0.95; r = 0.93, respectively). RSm showed an increase after toothbrush abrasion for all resin composites, however no significant correlation was detected (r = 0.21).There was a significant correlation between G and Ra ratios (r = - 0.95).
研究经受牙刷磨损的实验性和商业性树脂复合材料的填料粒径对三种表面性能的影响，这三种表面性能分别为表面粗糙度（SR）、表面光泽度（G）和颜色稳定性（CS）。
检测了四种型号（义获嘉/伟瓦登特）和一种商业树脂复合材料（德山），其填料粒径在100 - 1000纳米之间变化。从每种产品制备六个圆盘（10毫米×2毫米）并进行机械抛光。然后将样品在牙刷磨损机中进行20000次刷牙冲程。在牙刷磨损前后测量SR参数（Ra、Rt和RSm）、G和CS。通过双向方差分析及Bonferroni事后检验分析SR和G的变化。CS值进行单向方差分析和Bonferroni事后检验（α = 0.05）。
初始G值在73 - 87光泽单位（GU）之间，牙刷磨损后降低到8 - 64 GU范围内。牙刷磨损导致所测试材料的SR和G发生显著变化，这归因于填料粒径。颜色存在统计学显著差异（ΔE*范围为0.38 - 0.88）。填料粒径不影响颜色稳定性。牙刷磨损使所有测试材料的表面更粗糙且呈哑光状。尽管填料粒径之间表面粗糙度的个体差异并不总是显著的，但相关性表明一种趋势，即对于SR参数Ra和Rt，较大的填料粒径在磨损后导致更高的表面粗糙度（r分别为0.95和0.93）。所有树脂复合材料在牙刷磨损后RSm均增加，但未检测到显著相关性（r = 0.21）。G与Ra比值之间存在显著相关性（r = - 0.95）。
