Yu Hao, Feng Zhihong, Wang Ling, Mihcin Senay, Kang Jianfeng, Bai Shizhu, Zhao Yimin
State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Stomatology, Digital Dentistry Center, School of Stomatology, The Fourth Military Medical University, Xi'an 710032, China.
State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Stomatology, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi'an 710032, China.
Polymers (Basel). 2022 Aug 22;14(16):3422. doi: 10.3390/polym14163422.
This study aimed to investigate the biomechanical behaviors of polyether ether ketone (PEEK) and traditional materials (titanium and fiber) when used to restore tooth defects in the form of prefabricated post or customized post via computational modelling.
First, the prototype of natural tooth, and the prototypes of prefabricated post and customized post were established, respectively, whilst the residual root was restored with dentin ferrule using reverse engineering methods. Then, the stress and strain of CFR-PEEK (PEEK reinforced by 30% carbon fiber) and pure PEEK (PEEK without any reprocessing) post were compared with those made in traditional materials using the three-dimensional finite element method.
From the stress point of view, compared with metal and fiber posts, CFR-PEEK and pure PEEK prefabricated post both demonstrated reduced post-core interface stress, post stress, post-root cement stress and root cement stress; moreover, CFR-PEEK and pure PEEK customized post demonstrated reduced post stress, post-root cement stress and root cement stress, while the strain of CFR-PEEK post was the closest to that of dentin.
Compared with the traditional posts, both the CFR-PEEK and pure PEEK posts could reduce the risk of debonding and vertical root fracture, whether they were used as prefabricated posts or customized posts, but the biomechanical behavior of carbon fiber-reinforced CFR-PEEK restorations was the closest to dentin, no matter if they were used as prefabricated post or customized post. Therefore, the CFR-PEEK post could be more suitable to restore massive tooth defects. Pure PEEK needs filler reinforcement to be used for post-retained restoration.
本研究旨在通过计算建模研究聚醚醚酮（PEEK）和传统材料（钛和纤维）以预制桩或定制桩的形式修复牙齿缺损时的生物力学行为。
首先，分别建立天然牙原型、预制桩和定制桩的原型，同时采用逆向工程方法用牙本质箍修复残根。然后，使用三维有限元方法比较CFR-PEEK（30%碳纤维增强的PEEK）和纯PEEK（未经过任何再加工的PEEK）桩与传统材料制成的桩的应力和应变。
从应力角度来看，与金属桩和纤维桩相比，CFR-PEEK和纯PEEK预制桩均表现出桩核界面应力、桩应力、桩根粘结剂应力和牙根粘结剂应力降低；此外，CFR-PEEK和纯PEEK定制桩表现出桩应力、桩根粘结剂应力和牙根粘结剂应力降低，而CFR-PEEK桩的应变最接近牙本质的应变。
与传统桩相比，CFR-PEEK桩和纯PEEK桩无论是作为预制桩还是定制桩使用，都能降低脱粘和垂直根折的风险，但碳纤维增强的CFR-PEEK修复体的生物力学行为无论作为预制桩还是定制桩使用都最接近牙本质。因此，CFR-PEEK桩可能更适合修复大面积牙齿缺损。纯PEEK需要填充增强材料才能用于桩固位修复。
