目的:这项研究的目的是对定制或标准牙齿根内桩周围的树脂基质水泥的层厚度和微观结构进行综合审查。
方法:在PubMed上使用以下科学术语的组合进行了电子搜索:根腔内桩,树脂水泥,厚度,适应,牙髓后,层厚度,fit,形状,和牙髓核。文献选择标准接受以英语发表的文章,截至2021年5月,涉及体外分析,荟萃分析,随机对照试验,和前瞻性队列研究。
结果:搜索确定了154项研究,其中24项被认为与本研究相关。选定的研究提供了考虑水泥层厚度的重要数据,牙齿准备,牙髓后,和树脂基水泥的类型。根管系统的解剖学变异性,如椭圆形或C形,代表了用牙根内牙桩修复牙齿的挑战。肛门内柱与不同根部区域的拟合是可变的,导致树脂基质水泥的厚层和不规则层。像毛孔这样的缺陷,微裂纹,在树脂基水泥微观结构中检测到微间隙,并代表应力集中和断裂点。定制的牙根内柱提供了适当的配合,并减少了树脂基质水泥的层厚度。
结论:事实上,树脂基质水泥的层厚度取决于牙髓桩与牙根管的配合。树脂水泥厚度的增加会导致气孔等缺陷的出现,微裂纹,以及可以在界面处引起应力集中和断裂的微间隙。
结论:牙髓桩与牙根管的配合决定了树脂-基质水泥的层厚度,以建立足够的固位。然而,例如,树脂-基质水泥层厚度的增加可导致大量的缺陷,如孔隙或裂缝,并因此降低界面的强度。
OBJECTIVE: The aim of this study was to perform an integrative
review on the layer
thickness and microstructure of resin-matrix cements around custom-made or standard teeth root intracanal posts.
METHODS: An electronic search was conducted on the PubMed using a combination of the following scientific terms: intraradicular post, root intracanal post, resin cement, thickness, adaptation, endodontic post, layer
thickness, fit, shape, and endodontic core. The literature selection criteria accepted articles published in the English language, up to May 2021, involving in vitro analyses, meta-analyses, randomized controlled trials, and prospective cohort studies.
RESULTS: The search identified 154 studies, of which 24 were considered relevant to this study. The selected studies provided important data considering cement layer thickness, tooth preparation, endodontic post, and type of resin-matrix cement. The anatomical variability of root canal systems, such as the oval- or C-shaped, represents a challenge in dental restoration with tooth root intracanal posts. The fitting of intracanal posts to different root regions is variable resulting in thick and irregular layers of resin-matrix cement. Defects like pores, micro-cracks, and micro-gaps were detected in the resin-matrix cement microstructure and represent spots of stress concentration and fracture. Custom-made tooth root intracanal posts provide a proper fitting and decrease the layer
thickness of resin-matrix cement.
CONCLUSIONS: In fact, the layer thickness of resin-matrix cements depends on the fitting of endodontic posts to tooth root canals. An increase of resin cement
thickness causes the appearance of defects like pores, micro-cracks, and micro-gaps that can induce stress concentration and fractures at interfaces.
CONCLUSIONS: The fitting of the endodontic post into the teeth root canal determine the layer thickness of the resin-matrix cement to establish an adequate retention. However, the increase in the
thickness of the resin-matrix cement layer can lead to a high number of defects like pores or cracks and therefore decrease the strength of the interface.