Universidad de Buenos Aires, Facultad de Odontología, Cátedra de Materiales Dentales, Buenos Aires, Argentina.
Acta Odontol Latinoam. 2022 Apr 30;35(1):10-15. doi: 10.54589/aol.35/1/10.
The aim of this study was to determine Vickers microhardness (HV) in bulk fill resins at different depths. Test specimens were prepared with different bulk fill resins: Filtek Bulk-Fill (3M ESPE) [FBF], Surefill SDR flow (Dentsply) [SDR], Fill-UP (COLTENE) [FU] and Surefill (Dentsply) [SF]. Semi-cylindrical test specimens were prepared in a mold 6 mm in diameter and 4 mm thick (n=5). A 1000 mW/cm2 light curing unit was applied (Coltolux LED - Coltene) for 20 seconds. HV was determined with three indentations (Vickers Future Tech FM300, 300 g, 8 s) at four depths: 1, 2, 3 and 4 mm from the top surface to the interior. Data were recorded immediately (t0) and 24 hours later (t24). Results were analyzed with two-way ANOVA (p<0.05), and multiple comparisons were performed using Tukey's test. Mean and SD of HV at t0 for each mm were: [FBF] t0: 49.23(4.65) / 48.32(3.36) / 44.38(2.06) / 40.59(2.58); [FBF] t24: 61.37(3.47) / 62.63(3.03) / 57.27(5.22) / 56.37(5.88);[SDR]t0:27.81(3.13) / 28.07(2.4) / 27.24(2.94) / 25.71(3.0); [SDR] t24: 35.11(2.16) / 35.17(1.96) / 35.53(1.81) / 33.18(2.08); [FU] t0: 41.43(1.41) / 39.87(0.88) / 38.11(1.81) / 39.09(1.92); [FU] t24: 49.27(1.54) / 48.77(1.77) / 48.65(1.88) / 46.76(4.93); [SF] t0: 71.35(7.09) / 67.39(9.76) / 68.95(6.21) / 64.1(8.35); [SF] t24: 76.06(6.61) / 75.31(9.37) / 75.2(11.57) / 69.81(12.14). ANOVA showed significant effect of material, depth and recording time (p<0.05), and Tukey's test showed that recording sites (depths) differed significantly, giving four homogeneous groups. Under the conditions of this study, it can be concluded that microhardness of bulk-fill resins can be affected by depth and post-curing time.
本研究旨在确定不同深度的几种块状充填树脂的维氏显微硬度（HV）。使用不同的块状充填树脂制备试件：Filtek Bulk-Fill（3M ESPE）[FBF]、Surefill SDR 流动型（登士柏）[SDR]、Fill-UP（科尔滕）[FU]和 Surefill（登士柏）[SF]。在直径为 6 毫米、厚度为 4 毫米的模具中制备半圆柱形试件（n=5）。应用 1000 mW/cm2 的光固化器（Coltolux LED-Coltene）进行照射 20 秒。在距离试件表面 1、2、3 和 4 毫米处的四个深度处进行三次压痕（Vickers Future Tech FM300，300 g，8 s），以确定 HV。即刻（t0）和 24 小时后（t24）记录数据。采用双因素方差分析（p<0.05）分析结果，并采用 Tukey 检验进行多重比较。t0 时各毫米处 HV 的均值和标准差[FBF]t0：49.23(4.65) / 48.32(3.36) / 44.38(2.06) / 40.59(2.58)；[FBF]t24：61.37(3.47) / 62.63(3.03) / 57.27(5.22) / 56.37(5.88)；[SDR]t0：27.81(3.13) / 28.07(2.4) / 27.24(2.94) / 25.71(3.0)；[SDR]t24：35.11(2.16) / 35.17(1.96) / 35.53(1.81) / 33.18(2.08)；[FU]t0：41.43(1.41) / 39.87(0.88) / 38.11(1.81) / 39.09(1.92)；[FU]t24：49.27(1.54) / 48.77(1.77) / 48.65(1.88) / 46.76(4.93)；[SF]t0：71.35(7.09) / 67.39(9.76) / 68.95(6.21) / 64.1(8.35)；[SF]t24：76.06(6.61) / 75.31(9.37) / 75.2(11.57) / 69.81(12.14)。方差分析显示材料、深度和记录时间均有显著影响（p<0.05），Tukey 检验显示记录部位（深度）有显著差异，可分为四个同质组。在本研究条件下，可以得出结论，块状充填树脂的显微硬度可受到深度和后固化时间的影响。
