Structural and mechanical implications of PMMA implant shape and interface geometry in cranioplasty--A finite element study
Jazyk angličtina Země Scotland Médium print-electronic
Typ dokumentu časopisecké články, práce podpořená grantem
PubMed
26646634
DOI
10.1016/j.jcms.2015.10.014
PII: S1010-5182(15)00354-6
Knihovny.cz E-zdroje
- Klíčová slova
- 3D printing, Cranial trauma, Osteotomy, Patient-specific modelling, Rehabilitation,
- MeSH
- analýza metodou konečných prvků MeSH
- analýza zatížení zubů MeSH
- lebka * MeSH
- lidé MeSH
- mechanický stres MeSH
- polymethylmethakrylát MeSH
- protézy a implantáty * MeSH
- rozhraní kost/implantát * MeSH
- zubní implantáty * MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Názvy látek
- polymethylmethakrylát MeSH
- zubní implantáty * MeSH
This computational study investigates the effect of shape (defect contour curvature) and bone-implant interface (osteotomy angle) on the stress distribution within PMMA skull implants. Using finite element methodology, 15 configurations--combinations of simplified synthetic geometric shapes (circular, square, triangular, irregular) and interface angulations--were simulated under 50N static loads. Furthermore, the implant fixation devices were modelled and analysed in detail. Negative osteotomy configurations demonstrated the largest stresses in the implant (275 MPa), fixation devices (1258 MPa) and bone strains (0.04). The circular implant with zero and positive osteotomy performed well with maximum observed magnitudes of--implant stress (1.2 MPa and 1.2 MPa), fixation device stress (11.2 MPa and 2.2 MPa), bone strain (0.218e-3 and 0.750e-4). The results suggest that the preparation of defect sites is a critical procedure. Of the greatest importance is the angle at which the edges of the defect are sawed. If under an external load, the implant has no support from the interface and the stresses are transferred to the fixation devices. This can endanger their material integrity and lead to unphysiological strains in the adjacent bone, potentially compromising the bone morphology required for anchoring. These factors can ultimately weaken the stability of the entire implant assembly.
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