Department of Restorative Dentistry, Piracicaba Dental School-State University of Campinas, SP, Brazil.
J Esthet Restor Dent. 2011 Apr;23(2):106-14. doi: 10.1111/j.1708-8240.2011.00406.x.
It is unknown whether the staining pigment concentration would affect the color of composite resin and whether the absorption of the staining pigment is related to the degree of conversion (DC).
The purpose of this study was to evaluate the effect of light-curing units (LCUs) on DC, superficial staining (ΔE), and pigment concentration (PC) in a nanofilled composite resin (Z350, 3M ESPE) using different beverages.
Specimens were polymerized for 20 seconds using four LCUs (N=50): quartz-tungsten-halogen (QTH)--450 mW/cm(2); laser (LAS)--300 mW/cm(2); second-generation light-emitting diode (LED)-1100 mW/cm(2); and third generation LED--700 mW/cm(2). DC (%) was measured using Fourier transform infrared spectroscopy. Specimens concerning each group (N=10) were then immersed in one of the solutions (distilled water, red wine, whisky, coffee, and cola--40 min/day, for 40 days). Specimen's color was measured before and after exposure to solutions using a colorimeter (Commission Internacionale de I'Eclairaga Lab* color scale), and ΔE was calculated. Specimens were then prepared for the spectrophotometric analysis to measure PC. Data were submitted to two-way analysis of variance and Tukey's test (p=0.05).
DC: QTH presented the lowest DC, with statistical differences for LAS, LED 2, and LED 3. Whisky and wine showed lower PC mean values than cola and coffee. No statistical difference was observed for LCUs regarding PC and all staining solutions, except cola. Whisky showed the highest values for ΔE regarding all LCUs. Wine showed statistically lower ΔE than whisky, with water presenting the lowest ΔE. LAS and QTH showed higher values than LED 2 concerning ΔE.
LCUs interfered with DC and altered the PC and ΔE of the composite resin submitted to different staining solutions. There was no correlation among DC, PC, and ΔE.
Light-curing modes might interfere with staining susceptibility, stain's retention, and DC of a composite resin, compromising the clinical performance. The highest pigment absorption was not associated with the highest superficial staining of the composite resin. Alcoholic drinks lead to greater superficial staining and non-alcoholic solutions lead to a higher pigment concentration.
目前尚不清楚染色颜料浓度是否会影响复合树脂的颜色，以及染色颜料的吸收是否与转化率（DC）有关。
本研究的目的是评估使用不同饮料的光固化单位（LCU）对纳米复合树脂（Z350，3M ESPE）的 DC、表面染色（ΔE）和颜料浓度（PC）的影响。
用 4 个 LCU（N=50）对样本进行 20 秒的聚合：石英钨卤（QTH）-450 mW/cm²；激光（LAS）-300 mW/cm²；第二代发光二极管（LED）-1100 mW/cm²；第三代 LED-700 mW/cm²。使用傅立叶变换红外光谱法测量 DC（%）。然后，将每组（N=10）的样本浸入一种溶液（蒸馏水、红酒、威士忌、咖啡和可乐-40 分钟/天，持续 40 天）中。使用色度计（国际照明委员会 Lab*颜色标度）在暴露于溶液前后测量样本的颜色，并计算 ΔE。然后准备样本进行分光光度分析以测量 PC。数据提交给双因素方差分析和 Tukey 检验（p=0.05）。
DC：QTH 的 DC 最低，LAS、LED 2 和 LED 3 存在统计学差异。威士忌和红酒的 PC 平均值低于可乐和咖啡。LCU 对 PC 以及所有染色溶液均无统计学差异，可乐除外。威士忌对所有 LCU 的 ΔE 均显示出最高值。红酒的 ΔE 明显低于威士忌，而水的 ΔE 最低。LAS 和 QTH 的 ΔE 值高于 LED 2。
LCU 会干扰 DC，并改变复合树脂在不同染色溶液中的 PC 和 ΔE。DC、PC 和 ΔE 之间没有相关性。
光固化模式可能会影响复合树脂的染色敏感性、染色保留和 DC，从而影响临床性能。最高的颜料吸收并不与复合树脂的最高表面染色相关。含酒精的饮料会导致更大的表面染色，而非酒精溶液会导致更高的颜料浓度。
