Magalhães Tiago, Fidalgo-Pereira Rita, Torres Orlanda, Carvalho Óscar, Silva Filipe S, Henriques Bruno, Özcan Mutlu, Souza Júlio C M
University Institute of Health Sciences (IUCS), CESPU, 4585-116 Gandra PRD, Portugal.
Center for Interdisciplinary Research in Health (CIIS), Faculty of Dental Medicine (FMD), Universidade Católica Portuguesa (UCP), 3504-505 Viseu, Portugal.
J Funct Biomater. 2023 Mar 7;14(3):148. doi: 10.3390/jfb14030148.
This study aimed to assess the layer thickness and microstructure of traditional resin-matrix cements and flowable resin-matrix composites at dentin and enamel to composite onlay interfaces after cementation on low loading magnitude.
Twenty teeth were prepared and conditioned with an adhesive system for restoration with resin-matrix composite onlays manufactured by CAD-CAM. On cementation, tooth-to-onlay assemblies were distributed into four groups, including two traditional resin-matrix cements (groups M and B), one flowable resin-matrix composite (group G), and one thermally induced flowable composite (group V). After the cementation procedure, assemblies were cross-sectioned for inspection by optical microscopy at different magnification up to ×1000.
The layer thickness of resin-matrix cementation showed the highest mean values at around 405 µm for a traditional resin-matrix cement (group B). The thermally induced flowable resin-matrix composites showed the lowest layer thickness values. The resin-matrix layer thickness revealed statistical differences between traditional resin cement (groups M and B) and flowable resin-matrix composites (groups V and G) ( < 0.05). However, the groups of flowable resin-matrix composites did not reveal statistical differences ( < 0.05). The thickness of the adhesive system layer at around 7 µm and 12 µm was lower at the interfaces with flowable resin-matrix composites when compared to the adhesive layer at resin-matrix cements, which ranged from 12 µm up to 40 µm.
The flowable resin-matrix composites showed adequate flowing even though the loading on cementation was performed at low magnitude. Nevertheless, significant variation in thickness of the cementation layer was noticed for flowable resin-matrix composites and traditional resin-matrix cements that can occur in chair-side procedures due to the clinical sensitivity and differences in rheological properties of the materials.
本研究旨在评估在低加载量粘结后，传统树脂基质水门汀和可流动树脂基质复合材料在牙本质、牙釉质与复合高嵌体界面处的层厚度及微观结构。
制备20颗牙齿，并用粘结系统进行预处理，以用计算机辅助设计与制造（CAD-CAM）制作的树脂基质复合高嵌体进行修复。粘结时，将牙齿-高嵌体组件分为四组，包括两种传统树脂基质水门汀（M组和B组）、一种可流动树脂基质复合材料（G组）和一种热致可流动复合材料（V组）。粘结程序完成后，将组件进行横断面切片，通过光学显微镜在高达×1000的不同放大倍数下进行检查。
传统树脂基质水门汀（B组）的树脂基质粘结层厚度均值最高，约为405 µm。热致可流动树脂基质复合材料的层厚度值最低。树脂基质层厚度在传统树脂水门汀（M组和B组）与可流动树脂基质复合材料（V组和G组）之间存在统计学差异（<0.05）。然而，可流动树脂基质复合材料组之间未显示出统计学差异（<0.05）。与树脂基质水门汀处厚度范围为12 µm至40 µm的粘结层相比，可流动树脂基质复合材料界面处约7 µm和12 µm厚的粘结系统层更薄。
尽管粘结时加载量较低，但可流动树脂基质复合材料仍显示出足够的流动性。然而，由于临床敏感性和材料流变学特性的差异，在椅旁操作中，可流动树脂基质复合材料和传统树脂基质水门汀的粘结层厚度存在显著差异。
