Cervino Gabriele, Romeo Umberto, Lauritano Floriana, Bramanti Ennio, Fiorillo Luca, D'Amico Cesare, Milone Dario, Laino Luigi, Campolongo Francesco, Rapisarda Silvia, Cicciù Marco
Department of Biomedical and Dental Sciences, Morphological and Functional Images, School of Dentistry, University of Messina, ME, Italy.
Department of Oral and Maxillo-facial Sciences, Pediatric Dentistry Unit, "Sapienza" University of Rome, Rome, Italy.
Open Dent J. 2018 Mar 30;12:219-229. doi: 10.2174/1874210601812010219. eCollection 2018.
The objective of this investigation is to study prosthodontics and internal components resistance to the masticatory stress and considering different force directions by using Finite Element Method analysis (FEM). The structural materials of the components are usually Titanium alloy grade 4 or 5 and thus, guarantee the integration of the fixture in the bone due to the osteointegration phenomena. Even if the long-term dental implant survival rate is easy to be obtained and confirmed by numerous researches, the related clinical success, due to the alteration of the mechanical and prosthodontics components is still controversial.
By applying engineering systems of investigations like FEM and Von Mises analyses, it has been investigated how dental implant material was held against the masticatory strength during the dynamic masticatory cycles. A three-dimensional system involved fixture, abutment and the connection screws, which were created and analyzed. The elastic features of the materials used in the study were taken from recent literature data.
Data revealed a different response for both types of devices, although implant neck and dental abutment showed better results for all conditions of loading while the abutment screw represented aweak point of the system.
The data of this virtual model showed all the features of different prosthetic retention systems under the masticatory load. Clinicians should find better prosthetic balance in order to better distribute the stress over the component and to guarantee patients' clinical long-term results.
本研究的目的是通过有限元方法分析（FEM），研究口腔修复学及内部组件对咀嚼应力的抵抗能力，并考虑不同的力方向。组件的结构材料通常为4级或5级钛合金，因此，由于骨结合现象，可确保固定装置在骨内的整合。即使众多研究很容易获得并确认长期牙种植体的存活率，但由于机械和口腔修复组件的改变，相关的临床成功率仍存在争议。
通过应用诸如有限元方法和冯·米塞斯分析等工程研究系统，研究了在动态咀嚼周期中牙种植体材料如何抵抗咀嚼力。创建并分析了一个包含固定装置、基台和连接螺钉的三维系统。研究中使用材料的弹性特征取自近期的文献数据。
数据显示两种装置有不同的反应，尽管种植体颈部和牙基台在所有加载条件下都显示出更好的结果，而基台螺钉是系统的薄弱点。
该虚拟模型的数据显示了咀嚼负荷下不同修复固位系统的所有特征。临床医生应找到更好的修复平衡，以便更好地在组件上分散应力，并确保患者的临床长期效果。
