评价短纤维增强直接和间接覆盖修复体的骨折行为。
Evaluation of fracture behavior in short fiber-reinforced direct and indirect overlay restorations.
机构信息
Department of Biomaterials Science and Turku Clinical Biomaterial Center -TCBC, Institute of Dentistry, University of Turku, Turku, Finland.
Department of Prosthetic Dentistry, Faculty of Dentistry, Baskent University, Ankara, Turkey.
出版信息
Clin Oral Investig. 2023 Sep;27(9):5449-5458. doi: 10.1007/s00784-023-05164-2. Epub 2023 Jul 21.
OBJECTIVES
The aim was to assess how incorporating a short-fiber composite (SFC) core would affect the fracture behavior of direct and indirect overlays. Furthermore, to examine the relationship between the thickness ratio of SFC core to particulate-filled composite (PFC) veneering and the fracture-behavior of bilayered-structured restorations.
MATERIALS AND METHODS
A total of 120 molars were used to create MOD cavities, with palatal cusps removed. Four different groups of direct overlays were then made (n = 15/group), all of which featured a SFC core (everX Flow) with varying thicknesses (0, 1, 4, and 5 mm), as well as a surface layer of PFC (G-aenial Posterior), with the overall thickness of the bilayered-structured restoration set at 5 mm. Additionally, four groups of CAD/CAM restorations were created (Cerasmart 270 and Initial LiSi Block), with or without 2 mm of SFC core reinforcement. Following the fabrication of these restorations, cyclic fatigue aging was carried out for a total of 500,000 cycles, with an applied maximum load (F) of 150 N. Subsequently, each restoration underwent quasi-static loading until fracture. The fracture mode was subsequently evaluated using optical microscopy and SEM.
RESULTS
There were no statistically significant differences (p > 0.05) observed in the fracture resistance of indirect overlays reinforced with a 2-mm SFC core compared to those made solely from restorative materials. Direct overlays constructed using plain SFC or with a 4-mm layer thickness of SFC core exhibited significantly higher fracture resistance values (2674 ± 465 and 2537 ± 561 N) (p < 0.05) when compared to all other groups tested, according to the statistical analysis ANOVA.
CONCLUSIONS
The most effective method for restoring large MOD cavities was found to be direct restoration using SFC either alone or as a bulk core in combination with PFC composite.
CLINICAL RELEVANCE
The use of SFC as bulk reinforcing base will significantly improve the loading performance of directly layered restorations.
目的
评估短纤维复合材料（SFC）芯的加入如何影响直接和间接贴面的断裂行为。此外，还研究了 SFC 芯与颗粒填充复合树脂（PFC）贴面的厚度比与双层结构修复体断裂行为之间的关系。
材料和方法
共使用 120 颗磨牙制作 MOD 腔，去除腭尖。然后制作了四组不同的直接贴面（n=15/组），均采用不同厚度的 SFC 芯（everX Flow）（0、1、4 和 5mm）以及 PFC 表层（G-aenial Posterior），双层结构修复体的总厚度设定为 5mm。此外，还制作了四组 CAD/CAM 修复体（Cerasmart 270 和 Initial LiSi Block），其中一些有 2mm 的 SFC 芯增强。这些修复体制作完成后，进行了总计 50 万次的循环疲劳老化，施加的最大载荷（F）为 150N。随后，每个修复体都进行了准静态加载直至断裂。随后使用光学显微镜和 SEM 评估断裂模式。
结果
与仅由修复材料制成的间接贴面相比，用 2mm SFC 芯增强的间接贴面的抗断裂能力没有统计学上的显著差异（p>0.05）。与所有其他测试组相比，使用普通 SFC 或 4mm 厚 SFC 芯构建的直接贴面具有更高的抗断裂能力值（2674±465 和 2537±561N）（p<0.05），根据方差分析的统计分析。
结论
恢复大 MOD 腔的最有效方法是单独使用 SFC 或与 PFC 复合树脂结合使用 SFC 作为大块芯进行直接修复。
临床意义
SFC 作为大块增强基底的使用将显著提高直接分层修复体的承载性能。
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