Mahajan Rohini P, Shenoy Vanitha U, Sumanthini M V, Mahajan Harsha P, Walzade Pranjal S, Mangrolia Rajan
Department of Conservative Dentistry and Endodontics, MGM Dental College and Hospital, Navi Mumbai, Maharashtra, India, Phone: +918600167260, e-mail:
Department of Conservative Dentistry and Endodontics, MGM Dental College and Hospital, Navi Mumbai, Maharashtra, India.
J Contemp Dent Pract. 2019 Feb 1;20(2):226-230.
Composite resins are choice of restorations due to their lifelike characteristics. Recently "microhybrid" and "nano- hybrid" composites have been introduced. Microhybrids and Nanocomposites have a small particle size and possess better qualities as compared to traditional composite resins. The intake of beverages like black tea, coffee green tea has increased in the community. The beverages cause discoloration with time on the composite restorations making it aesthetically unacceptable.
Aim is to evaluate discoloration of microhybrid and nano- hybrid composite resins by black tea, black coffee, green tea and distilled water at 0, 3, 6, 9, and 12 days.
160 samples were fabricated in molds from two nanohybrid composite and two microhybrid composites. They were light cured and allocated into four groups were stored in an incubator throughout the experiment at 37° C. Initial baseline color was recorded by a spectrophotometer. These samples were immersed in vials containing black tea, black coffee, green tea and distilled water for three, six, nine, 12 days. Color analysis was done at each interval.
Data was tabulated and the readings after immersion and baseline were compared between four composite resins. Data were analyzed using the appropriate test by testing normality. A value <0.05 was considered to be significant.
Significant discoloration was observed in all four composite resins. Discoloration increased from the third day to 12th day. Maximum discoloration was observed on the 12th day.
The order of discoloration in the beverages was: Flash > Tetric n ceram > matrix > tetricceram. The order of discoloration caused by test solutions on composite resin was: Black coffee>black tea>green tea > distilled water.
复合树脂因其逼真的特性而成为修复材料的首选。近年来，“微混合”和“纳米混合”复合树脂相继问世。与传统复合树脂相比，微混合和纳米复合树脂的颗粒尺寸更小，性能更佳。在社会群体中，红茶、咖啡、绿茶等饮品的摄入量有所增加。随着时间的推移，这些饮品会导致复合树脂修复体变色，使其美观性大打折扣。
旨在评估微混合和纳米混合复合树脂在0、3、6、9和12天时被红茶、黑咖啡、绿茶和蒸馏水染色的情况。
用两种纳米混合复合树脂和两种微混合复合树脂在模具中制作160个样本。样本经光固化处理后分为四组，在整个实验过程中于37℃的培养箱中保存。用分光光度计记录初始基线颜色。将这些样本分别浸泡在装有红茶、黑咖啡、绿茶和蒸馏水的小瓶中3天、6天、9天、12天。在每个时间间隔进行颜色分析。
将数据制成表格，比较四种复合树脂浸泡后的读数与基线读数。通过检验正态性，使用适当的检验方法对数据进行分析。P值<0.05被认为具有显著性。
在所有四种复合树脂中均观察到显著变色。变色从第三天到第十二天逐渐增加。在第十二天观察到最大变色。
饮品导致变色的顺序为：Flash>Tetric n ceram>matrix>tetricceram。测试溶液导致复合树脂变色的顺序为：黑咖啡>红茶>绿茶>蒸馏水。
