Poggio Claudio, Viola Matteo, Mirando Maria, Chiesa Marco, Beltrami Riccardo, Colombo Marco
Department of Clinical, Surgical, Diagnostic and Pediatric Sciences, Section of Dentistry, University of Pavia, Pavia, Italy.
Dent Res J (Isfahan). 2018 May-Jun;15(3):166-172.
Acidic beverages, such as soft drinks (orange juice and cola), can produce erosion of resin composites. The aim of this study was to evaluate the effect of immersion in acidic drink on the Vickers microhardness (VK) of different esthetic restorative materials (one nanohybrid Ormocer-based composite, one nanoceramic composite, one nanofilled composite, and one microfilled hybrid composite).
In this study, thirty specimens of each esthetic restorative material were divided into three subgroups ( = 10): specimens of group 1 were used as control, specimens of group 2 were immersed in 50 ml of acidic drink for 1 day, specimens of group 3 were immersed in 50 ml of acidic drink for 7 days. Data were analyzed by Shapiro-Wilk test to assess the normality of the distributions followed by nonparametric Kruskal-Wallis analysis of variance and Mann-Whitney U-test comparison test among groups. A significant level of α = 0.05 was set for comparison between the groups.
Mann-Whitney U-test showed that each material showed lower microhardness values after immersion in acidic solution ( < 0.05). Paired -test confirmed that microhardness for each composite did not change after immersion in distilled water (Control group) ( > 0.05). Significant changes were registered for all restorative materials after immersion in acidic solution for 1 day and 7 days ( < 0.05).
The Filtek Supreme XTE, a nanofilled composite, and Admira Fusion, a nanohybrid ormocer-based composite, showed the best behavior. The Ceram X Universal (nanoceramic composite) although reached lower hardness values than the previous materials, but resisted well to the 1 week immersion in soft-drink. Finally, the Gradia Direct achieved the most disappointing results: Low microhardness values are justified by the nature of its filling (microfilled hybrid composite).
酸性饮料，如软饮料（橙汁和可乐），会对树脂复合材料产生侵蚀。本研究的目的是评估浸泡在酸性饮料中对不同美学修复材料（一种基于纳米杂化有机硅氧烷的复合材料、一种纳米陶瓷复合材料、一种纳米填充复合材料和一种微填充混合复合材料）维氏显微硬度（VK）的影响。
在本研究中，每种美学修复材料的30个样本被分为三个亚组（每组n = 10）：第1组样本用作对照，第2组样本浸泡在50毫升酸性饮料中1天，第3组样本浸泡在50毫升酸性饮料中7天。数据通过Shapiro-Wilk检验进行分析，以评估分布的正态性，随后进行非参数Kruskal-Wallis方差分析和组间Mann-Whitney U检验比较。设定显著性水平α = 0.05用于组间比较。
Mann-Whitney U检验表明，每种材料在浸泡在酸性溶液后显微硬度值均降低（P < 0.05）。配对t检验证实，每种复合材料在浸泡在蒸馏水中（对照组）后显微硬度没有变化（P > 0.05）。所有修复材料在浸泡在酸性溶液1天和7天后均出现显著变化（P < 0.05）。
纳米填充复合材料Filtek Supreme XTE和基于纳米杂化有机硅氧烷的复合材料Admira Fusion表现最佳。Ceram X Universal（纳米陶瓷复合材料）虽然硬度值低于前两种材料，但在软饮料中浸泡1周后耐受性良好。最后，Gradia Direct的结果最令人失望：其低显微硬度值由其填充材料的性质（微填充混合复合材料）决定。
