Yang Beibei, Wang Boxuan, Du Liangzhi, Wang Fang
Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University, Xi'an, Shaanxi, PR China; Clinical Research Center of Shaanxi Province for Dental and Maxillofacial Diseases, College of Stomatology, Xi'an Jiaotong University, Xi'an, Shaanxi, PR China.
Postgraduate student, Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University, Xi'an, Shaanxi, PR China.
Int Dent J. 2025 Jul 19;75(5):100918. doi: 10.1016/j.identj.2025.100918.
Ferrule heights and post-core materials are key factors for post-core restorations, and the interaction between them needs further investigation. This study used finite element analysis to evaluate the stress distribution of post-core models with different materials and varying ferrule heights.
A 3-dimensional finite element model of the maxillary central incisor was constructed, along with 3 additional groups with different ferrule heights: 2 mm, 1 mm, and 0 mm. Meanwhile, various materials were designed to form the post-core: Zirconia, Titanium, Fiberglass, PEEK, and CFR-PEEK (PEEK reinforced by 30% carbon fiber). A 100 N load was applied at an angle of 45° with the tooth's longitudinal axis on the palatal surface of the crown. The peak von Misses (VM) stress values were recorded.
As the ferrule height increased, a stress reduction was observed at post-core and post-cement interfaces, while the stress in root and cement interfaces increased; meanwhile, the peak VM stress of the post-core decreased among all groups, while that of rigid material groups (Zirconia/Titanium) decreased more significantly; in addition, the peak VM stress at post-core and cement interfaces increased, and that of the 0 mm ferrule PEEK group was the highest.
Ferrule heights and post-core materials affect stress distribution on post-core restorations. A sufficiently large ferrule height can effectively compensate for the stress concentration of highly rigid materials, and PEEK post-core should be carefully used in 0 mm ferrule cases.
This study would provide suggestions for dentists to choose appropriate post-core materials according to various ferrule heights.
桩核高度和桩核材料是桩核修复的关键因素，它们之间的相互作用需要进一步研究。本研究采用有限元分析方法，评估不同材料和不同桩核高度的桩核模型的应力分布情况。
构建上颌中切牙的三维有限元模型，并增加另外3组不同桩核高度的模型：2mm、1mm和0mm。同时，设计了多种材料来制作桩核：氧化锆、钛、玻璃纤维、聚醚醚酮（PEEK）以及碳纤维增强聚醚醚酮（CFR-PEEK，由30%碳纤维增强的PEEK）。在牙冠腭面与牙齿纵轴呈45°角施加100N的载荷。记录冯·米塞斯（VM）应力峰值。
随着桩核高度增加，桩核与粘结剂界面处应力减小，牙根与粘结剂界面处应力增大；同时，所有组中桩核的VM应力峰值均降低，而刚性材料组（氧化锆/钛）的降低更为显著；此外，桩核与粘结剂界面处的VM应力峰值增加，0mm桩核高度的PEEK组的应力峰值最高。
桩核高度和桩核材料会影响桩核修复体的应力分布。足够大的桩核高度可有效补偿高刚性材料的应力集中，在0mm桩核的情况下应谨慎使用PEEK桩核。
本研究将为牙医根据不同桩核高度选择合适的桩核材料提供建议。
