Assessment of cranial reconstruction utilizing various implant materials: finite element study

Area of Science:

• Biomaterials Science
• Neurosurgery
• Mechanical Engineering

Background:

• Cranioplasty, a procedure to repair skull defects, traditionally uses titanium implants.
• Titanium's limitations necessitate exploring alternative materials for improved cranial reconstruction.
• Impact injuries can necessitate craniectomy, creating a need for effective cranioplasty solutions.

Purpose of the Study:

• To investigate alternative materials to titanium for cranial implants.
• To address limitations associated with titanium in cranioplasty procedures.
• To enhance the performance and success rate of cranial reconstruction.

Main Methods:

• A 3D skull model with a defect was created and virtually reconstructed with an implant.
• Simulations were performed using various materials (alumina, zirconia, hydroxyapatite, PMMA, zirconia-reinforced PMMA) under 2000N impact forces.
• Stresses and strains on the skull and brain were analyzed for each material compared to titanium.

Main Results:

• Alumina and zirconia implants significantly reduced skull and brain stresses and strains compared to titanium.
• PMMA and hydroxyapatite implants were prone to fracture and potentially caused skull damage.
• None of the tested implants exceeded critical stress and strain limits for the brain.

Conclusions:

• Alumina and zirconia demonstrate potential as superior alternatives to titanium for cranial implants.
• Zirconia-reinforced PMMA offers improved performance over standard PMMA for cranial implants.
• Alternative materials could enhance cranioplasty success by overcoming titanium's limitations.