Faculty of Dentistry, Department of Endodontics, Kutahya Health Sciences University, Kutahya, Turkey.
Faculty of Dentistry, Department of Endodontics, Suleyman Demirel University, Isparta, Turkey.
PLoS One. 2021 Oct 13;16(10):e0258534. doi: 10.1371/journal.pone.0258534. eCollection 2021.
This ex vivo study aimed to evaluate the strengthening effect of different ferrule and reattachment designs with fiber and adhesive materials on vertically fractured teeth.
Ninety extracted single-root premolars were instrumented and divided into nine groups (two control groups and seven experimental groups; n = 10). The negative control (NC) group comprised of intact teeth, while the positive control (PC) group comprised of root canal-treated teeth. The roots of the teeth in the experimental groups were vertically fractured into two equal fragments. The fragments were reattached with one of the followings: 4-methacryloxyethyl trimellitate anhydride/methacrylate-tri-n-butyl borane (4-META/MMA-TBB) resin, 4-META/MMA-TBB + quartz fiber post, 4-META/MMA-TBB + glass fiber bundles, 4-META/MMA-TBB + quartz fiber post + 1 mm ferrule, 4-META/MMA-TBB + glass fiber bundles + 1 mm ferrule, 4-META/MMA-TBB + quartz fiber post + 2 mm ferrule, and 4-META/MMA-TBB + glass fiber bundles + 2 mm ferrule. The core build-ups were made with composite resin. The specimens were subjected to compressive loading until failure occurred. Mean load necessary to fracture each sample and the fracture types of these samples were recorded.
The highest mean fracture load was recorded in the NC group (1,036.7 N), which was not significantly higher than the PC group (989.66 N) (p > 0.05). The roots reattached with quartz fiber post demonstrated significantly less fracture strength (871.9 N) as compared to the other test and control groups (p < 0.05). There was no significant difference between the PC group and reattached fragments with different ferrule designs in terms of fracture resistance (p > 0.05).
The customized fiber bundles may be more suitable for reattachment of vertically fractured teeth than the rigid fiber posts. For reattachment procedures, the ferrule design may be preferred to increase the fracture strength of vertically fractured teeth.
本离体研究旨在评估不同套圈和再附着设计对垂直折裂牙的强化效果，使用纤维和黏接材料。
90 颗离体单根前磨牙被仪器化，并分为 9 组（2 个对照组和 7 个实验组；n = 10）。阴性对照组（NC）包括完整的牙齿，而阳性对照组（PC）包括根管治疗的牙齿。实验组的牙齿根部被垂直地分成两个相等的片段。使用以下方法之一将这些片段重新附着：4-甲基丙烯酰氧基乙基偏苯三酸酐/甲基丙烯酸三-n-丁基硼烷（4-META/MMA-TBB）树脂、4-META/MMA-TBB+石英纤维桩、4-META/MMA-TBB+玻璃纤维束、4-META/MMA-TBB+石英纤维桩+1mm 套圈、4-META/MMA-TBB+玻璃纤维束+1mm 套圈、4-META/MMA-TBB+石英纤维桩+2mm 套圈和 4-META/MMA-TBB+玻璃纤维束+2mm 套圈。用复合树脂进行核堆积。将标本置于压缩载荷下，直至发生断裂。记录每个样本断裂所需的平均载荷和这些样本的断裂类型。
NC 组记录的平均断裂载荷最高（1036.7N），但与 PC 组（989.66N）相比差异无统计学意义（p>0.05）。与其他测试和对照组相比，用石英纤维桩重新附着的牙根显示出明显较低的断裂强度（871.9N）（p<0.05）。PC 组与不同套圈设计的重新附着片段在抗断裂能力方面无显著差异（p>0.05）。
定制纤维束可能比刚性纤维桩更适合重新附着垂直折裂牙。对于再附着程序，套圈设计可能更有利于增加垂直折裂牙的断裂强度。
