Department of Operative and Esthetic Dentistry, Faculty of Dentistry, University of Szeged, Szeged, Hungary.
dicomLAB Dental Ltd, Szeged, Hungary.
Odontology. 2021 Jan;109(1):222-230. doi: 10.1007/s10266-020-00522-y. Epub 2020 May 2.
The aim was to explore the fracture-behavior, survival and marginal-microgaps within the root-canal of immature anterior teeth restored with different fiber-reinforced post-core composites (FRCs). 180 bovine-incisors were randomly divided into 6 groups (n = 30). One group served as control (group 6). The rest of the teeth were prepared to an internal diameter of 1.6 mm and the apex was sectioned. After application of an MTA-plug, teeth were restored with FRC materials: Group 1: Bioblock technique with short fiber-reinforced composite (SFRC); Group 2: Bioblock technique with flowable SFRC; Group 3: Individually-made FRC post; Group 4: Conventional FRC post; Group 5: dual-cure core build-up composite. After restorations were completed, teeth (n = 5/group) were sectioned and then stained. Specimens were viewed under a stereo microscope and the percentage of microgaps within the root-canal was calculated. Fatigue-survival was measured using a cyclic-loading testing machine in the rest of the specimens. Flowable SFRC application in the root-canal (Group 2) did not differ from intact-teeth regarding fatigue-survival (p > 0.05). The rest of the groups produced significantly lower survival (p < 0.05) compared to intact-teeth. Post/core restorations made from conventional FRC post (Group 4) exhibited a high number of microgaps (38.3%) at the examined interphase in the root-canal. The restoration of immature incisors with the use of flowable SFRC as post-core material displayed promising performance in a matter of fatigue-resistance and survival.
目的是探索不同纤维增强型桩核复合材料（FRC）修复未成熟前牙根管内的断裂行为、存活率和边缘微间隙。180 颗牛切牙被随机分为 6 组（n=30）。一组作为对照组（第 6 组）。其余的牙齿被制备到 1.6mm 的内径，根尖被截断。在应用 MTA 塞后，用 FRC 材料修复牙齿：第 1 组：短纤维增强复合材料的 Bioblock 技术（SFRC）；第 2 组：Bioblock 技术中的流动 SFRC；第 3 组：定制 FRC 桩；第 4 组：常规 FRC 桩；第 5 组：双固化核堆积复合材料。修复完成后，每组（n=5）取 5 颗牙齿进行切割，然后染色。将标本在立体显微镜下观察，并计算根管内的微间隙百分比。其余标本的疲劳存活率使用循环加载试验机进行测量。在根管中应用流动 SFRC（第 2 组）与完整牙齿的疲劳存活率没有差异（p>0.05）。其余组的存活率明显低于完整牙齿（p<0.05）。传统 FRC 桩制成的桩核修复体（第 4 组）在根管的检查界面处显示出大量的微间隙（38.3%）。使用流动 SFRC 作为桩核材料修复未成熟切牙在抗疲劳和存活率方面表现出良好的性能。
