Department of Operative Dentistry, Endodontics and Dental Materials, Bauru Dental School, University of Sao Paulo, Al. Octavio Pinheiro Brisolla, 9-75, Bauru, Sao Paulo, Brazil.
J Dent. 2009 Dec;37(12):970-7. doi: 10.1016/j.jdent.2009.08.002. Epub 2009 Aug 15.
To evaluate the influence of two surface sealants (BisCover/Single Bond) and three application techniques (unsealed/conventional/co-polymerization) on the roughness of two composites (Filtek Z250/Z350) after the toothbrushing test.
Seventy-two rectangular specimens (5 mm x10 mm x 3 mm) were fabricated and assigned into 12 groups (n=6). Each sample was subjected to three random roughness readings at baseline, after 100,000 (intermediate), and 200,000 (final) toothbrushing strokes. Roughness (R) at each stage was obtained by the arithmetic mean of the reading of each specimen. Sealant removal was qualitatively examined (optical microscope) and classified into scores (0-3). Data were analyzed by Student's paired t-test, two-way ANOVA/Tukey's test, and by Wilcoxon, Kruskal-Wallis and Miller's test (alpha=0.05).
Z250 groups at baseline did not differ statistically from each other. Unsealed Z350 at baseline had lower R values. All the unsealed groups presented gradual decrease in R from baseline to final brushing. From baseline to the intermediate stage, Z250 co-polymerized groups presented a significant reduction in R (score 3). Conventionally sealed groups had no significant changes in R (scores 2-0.8). From baseline to the intermediate stage, the conventionally sealed Z350 Single Bond group had an increase in R (score 1.5). In the final stage, all the conventionally sealed groups presented a reduction in R (scores 0.7-0). Co-polymerized Single Bond groups had a significant reduction in R (scores 2.5-2.7), and co-polymerized BisCover groups an increase in R (scores 2.8-3).
At any brushing stage, sealed composites presented superior performance when compared with unsealed composites.
评估两种表面密封剂（BisCover/SingleBond）和三种应用技术（未密封/常规/共聚）对两种复合材料（Filtek Z250/Z350）在刷牙测试后的粗糙度的影响。
制备 72 个矩形样本（5mm×10mm×3mm），并将其分为 12 组（n=6）。每个样本在基线、100,000 次（中间）和 200,000 次（最终）刷牙冲程后进行三次随机粗糙度读数。每个样本的读数算术平均值获得每个阶段的粗糙度（R）。用光学显微镜定性检查密封剂去除情况，并将其分类为评分（0-3）。使用学生配对 t 检验、双因素方差分析/Tukey 检验以及 Wilcoxon、Kruskal-Wallis 和 Miller 检验对数据进行分析（alpha=0.05）。
基线时 Z250 组之间没有统计学差异。基线时未密封的 Z350 具有较低的 R 值。所有未密封组的 R 值从基线到最终刷牙呈逐渐下降趋势。从基线到中间阶段，Z250 共聚组的 R 值显著降低（评分 3）。常规密封组的 R 值没有显著变化（评分 2-0.8）。从基线到中间阶段，常规密封的 Z350 SingleBond 组的 R 值增加（评分 1.5）。在最终阶段，所有常规密封组的 R 值均降低（评分 0.7-0）。共聚 SingleBond 组的 R 值显著降低（评分 2.5-2.7），共聚 BisCover 组的 R 值增加（评分 2.8-3）。
在任何刷牙阶段，与未密封的复合材料相比，密封的复合材料表现出更好的性能。
