da Rosa Gabriela Migliorin, da Silva Luciana Mendonça, de Menezes Márcio, do Vale Hugo Felipe, Regalado Diego Ferreira, Pontes Danielson Guedes
Department of Operative Dentistry, School of Health Sciences, State University of Amazonas, UEA, Manaus, Brazil.
Department of Operative Dentistry, Postgraduate Program in Dentistry, Faculty of Dentistry, Federal University of Amazonas, UFAM, Manaus, Brazil.
Eur J Dent. 2016 Apr-Jun;10(2):170-175. doi: 10.4103/1305-7456.178305.
The present study verified the influence of whitening dentifrices on the surface roughness of a nanohybrid composite resin.
Thirty-two specimens were prepared with Filtek™ Z350 XT (3M/ESPE) and randomly divided into four groups (n = 08) that were subjected to brushing simulation equivalent to the period of 1 month. The groups assessed were a control group with distilled water (G1), Colgate Total 12 Professional Clean (G2), Sensodyne Extra Whitener Extra Fresh (G3), and Colgate Luminous White (G4). A sequence of 90 cycles was performed for all the samples. The initial roughness of each group was analyzed by the Surface Roughness Tester (TR 200-TIME Group Inc., CA, USA). After the brushing period, the final roughness was measured, and the results were statistically analyzed using nonparametric Kruskal-Wallis and Dunn tests for intergroup roughness comparison in the time factor. For intragroup and "Δ Final - Initial" comparisons, the Wilcoxon test and (one-way) ANOVA were, respectively, performed (α = 0.05).
The roughness mean values before and after brushing showed no statistically significant difference when the different dentifrices were used. None of the dentifrices analyzed increased significantly the nanohybrid composite resin surface roughness in a 1 month of tooth brushing simulation.
These results suggest that no hazardous effect on the roughness of nanohybrid composite resin can be expected when whitening dentifrices are used for a short period. Similar studies should be conducted to analyze other esthetic composite materials.
本研究验证了美白牙膏对纳米混合复合树脂表面粗糙度的影响。
用Filtek™ Z350 XT（3M/ESPE）制备32个样本，并随机分为四组（n = 8），使其接受相当于1个月时长的刷牙模拟。评估的组包括用蒸馏水的对照组（G1）、高露洁全效12专业清新牙膏（G2）、舒适达极致美白清新牙膏（G3）和高露洁亮白牙膏（G4）。对所有样本进行90个周期的操作。每组的初始粗糙度通过表面粗糙度测试仪（TR 200 - TIME Group Inc.，美国加利福尼亚州）进行分析。在刷牙期结束后，测量最终粗糙度，并使用非参数Kruskal - Wallis和Dunn检验对时间因素中的组间粗糙度比较进行统计分析。对于组内比较和“最终 - 初始差值”比较，分别进行Wilcoxon检验和（单因素）方差分析（α = 0.05）。
使用不同牙膏刷牙前后的粗糙度平均值无统计学显著差异。在1个月的刷牙模拟中，所分析的牙膏均未显著增加纳米混合复合树脂的表面粗糙度。
这些结果表明，短期内使用美白牙膏对纳米混合复合树脂的粗糙度没有有害影响。应开展类似研究以分析其他美学复合材料。
