Gallicchio Vito, Lodato Vincenzo, De Santis Roberto, Rengo Sandro
Department of Neurosciences, Reproductive and Odontostomatological Sciences, University "Federico II" of Naples, Via S. Pansini 5, 80131 Naples, Italy.
Institute of Polymers, Composites and Biomaterials-National Research Council of Italy, V.le J.F. Kennedy 54-Mostra d'Oltremare Pad. 20, 80125 Naples, Italy.
Materials (Basel). 2022 Feb 1;15(3):1141. doi: 10.3390/ma15031141.
Physical and mechanical properties of continuous carbon or glass fiber reinforced endodontic posts are relevant to increase the retention and resistance of the tooth-restoration system. Hollow posts have been recently designed for delivering the luting cement through the post hole, thus enhancing the post-dentin interface by reducing the risk of air bubbles formation. Methods: Three type of endodontic posts, a carbon fiber hollow post, a glass fiber hollow post and a compact glass fiber post were investigated. Mechanical properties of these posts were assessed through bending tests. Teeth were subjected to fatigue cycling and the strength of restored teeth was detected through static tests. Failure modes were investigated through optical and scanning electron microscopy. Results show that composite posts increase the mechanical stability by more than 100% compared to premolars restored with particulate composite. Carbon fiber posts retain the highest strength (1467 N ± 304 N) among the investigated post and core restoration, but an unfavorable type of fracture has been observed, preventing the tooth re-treatment. Instead, more compliant posts (i.e., glass fiber reinforced composite, providing a strength of 1336 N ± 221 N), show a favorable mode of fracture that allows the re-treatment of teeth in the case that failure occurs. Glass fiber hollow posts show a good trade-off between strength and a favorable type of fracture.
连续碳纤维或玻璃纤维增强根管桩的物理和机械性能与提高牙齿修复系统的固位力和抗力相关。最近设计的中空桩可通过桩孔输送粘结水门汀，从而通过降低气泡形成的风险来增强桩-牙本质界面。方法：研究了三种类型的根管桩，即碳纤维中空桩、玻璃纤维中空桩和致密玻璃纤维桩。通过弯曲试验评估这些桩的机械性能。对牙齿进行疲劳循环试验，并通过静态试验检测修复后牙齿的强度。通过光学显微镜和扫描电子显微镜研究失效模式。结果表明，与用颗粒状复合材料修复的前磨牙相比，复合桩可使机械稳定性提高100%以上。在所研究的桩核修复体中，碳纤维桩保持最高强度（1467 N±304 N），但观察到一种不利的骨折类型，妨碍了牙齿再治疗。相反，更具柔韧性的桩（即玻璃纤维增强复合材料，强度为1336 N±221 N）显示出有利的骨折模式，在发生失败的情况下允许对牙齿进行再治疗。玻璃纤维中空桩在强度和有利的骨折类型之间表现出良好的权衡。
