Analytical Laboratory of Restorative Biomaterials - LABiom-R, School of Dentistry, Universidade Federal Fluminense, Niterói, Rio de Janeiro, Brazil.
Universidade Federal Fluminense/Faculdade de Odontologia -Rua Mário Santos Braga, nº 30 - Campus Valonguinho, Centro, Niterói, RJ, CEP 24040, Brazil.
Clin Oral Investig. 2024 Aug 23;28(9):496. doi: 10.1007/s00784-024-05887-w.
To evaluate the marginal integrity (MI%) and to characterize specific properties of a thermoviscous bulk-fill resin composite, two regular bulk-fill resin composites, and a non-bulk-fill resin composite.
VisCalor bulk (VBF), Filtek One Bulk Fill (OBF), and Aura Bulk Fill (ABF) were evaluated. Filtek Z250 XT (ZXT) was used as non-bulk-fill control. MI% was evaluated in standardized cylindrical cavities restored with the composites by using a 3D laser confocal microscope. The following properties were characterized: volumetric polymerization shrinkage (VS%), polymerization shrinkage stress (Pss), degree of conversion (DC%), microhardness (KHN), flexural strength (FS), and elastic modulus (EM). Data were analyzed by one-way and two-way ANOVA, and Tukey HSD post-hoc test (α = 0.05).
VBF presented the highest MI% and the lowest VS% and Pss (p < 0.05). DC% ranged from 59.4% (OBF) to 71.0% (ZXT). ZXT and VBF presented similar and highest KHN than OBF and ABF (p < 0.05). ABF presented the lowest FS (p < 0.05). EM ranged from 5.5 GPa to 7.7 GPa, with the values of ZXT and VBF being similar and statistically higher than those of OBF and ABF (p < 0.05).
Thermoviscous technology employed by VisCalor bulk was able to improve its mechanical behavior comparatively to regular bulk-fill resin composites and to contribute to a better marginal integrity in restorations built up in cylindrical cavities with similar geometry to a class I cavity as well. Although presenting overall better physicomechanical properties, Z250 XT presented the worst MI%.
The marginal integrity, which is pivotal for the success of resin composite restorations, could be improved using VisCalor bulk-fill. The worst MI% presented by Z250 XT reinforces that non-bulk-fill resin composites shall not be bulk-inserted in the cavity to be restored.
评估边缘完整性（MI%）并分析一种热塑粘性块状填充树脂复合材料、两种常规块状填充树脂复合材料和一种非块状填充树脂复合材料的特定性能。
评估 VisCalor bulk（VBF）、Filtek One Bulk Fill（OBF）和 Aura Bulk Fill（ABF）。Filtek Z250 XT（ZXT）用作非块状填充对照。通过使用 3D 激光共聚焦显微镜评估在标准化圆柱形腔室内用复合材料修复后的 MI%。对以下性能进行了表征：体积聚合收缩（VS%）、聚合收缩应力（Pss）、转化率（DC%）、显微硬度（KHN）、弯曲强度（FS）和弹性模量（EM）。采用单因素和双因素方差分析及 Tukey HSD 事后检验（α=0.05）对数据进行分析。
VBF 表现出最高的 MI%和最低的 VS%和 Pss（p<0.05）。DC%范围为 59.4%（OBF）至 71.0%（ZXT）。ZXT 和 VBF 具有与 OBF 和 ABF 相似且高于 OBF 和 ABF 的最高 KHN（p<0.05）。ABF 表现出最低的 FS（p<0.05）。EM 范围为 5.5 GPa 至 7.7 GPa，ZXT 和 VBF 的值与 OBF 和 ABF 的值相似且统计学上更高（p<0.05）。
与常规块状填充树脂复合材料相比，VisCalor bulk 采用的热塑技术能够改善其机械性能，并有助于在具有类似 I 类腔形状的圆柱形腔室内构建的修复体中获得更好的边缘完整性。尽管 Z250 XT 具有整体更好的物理机械性能，但 MI%最差。
对于树脂复合材料修复体的成功至关重要的边缘完整性，可以通过使用 VisCalor 块状填充来改善。Z250 XT 表现出最差的 MI%，这进一步证实了非块状填充树脂复合材料不应整块插入要修复的腔室内。
