Cold-Injection Molded Gentamicin-Impregnated Polymethyl Methacrylate Implants for Cranioplasty

Current cranioplasty options include autologous bone or synthetic substitutes. However, ordering custom 3D implants can be difficult and time-consuming. Prior research has shown that autologous bone is limited by availability and healing time. Synthetic alternatives are widely used but lack standardization. No prior work had resolved the challenge of reliably producing accurate, cost-effective implants. This gap motivated the development of a streamlined method using 3D printing and mold-based fabrication. Existing methods often involve high variability due to operator dependence. This paper introduces a novel technique that reduces such variability. The need for a consistent and efficient cranioplasty solution remains unmet in current literature.

The aim of the study was to evaluate a streamlined technique for producing patient-specific cranioplasty implants. The focus was on using 3D CAD design and cold injection molding to improve reproducibility. The problem addressed is the variability and inefficiency of current implant fabrication methods. The motivation stems from the need for accurate and consistent implants in cranial reconstruction. This approach aims to minimize post-molding adjustments and reduce operator-dependent factors. The study tested the feasibility and outcomes of this method in real-world clinical settings. The goal was to demonstrate a reliable and efficient alternative to conventional cranioplasty techniques. The results could inform future standardization of 3D-printed implant production.

The study involved 15 patients requiring cranioplasty. Implants were designed using 3D computer-assisted design (CAD) software. A cold injection molding technique was used to fabricate the implants. Commercially available 3D printers were used to create the initial molds. Silicone molds were prepared for replication with consistent results. The implants were made from polymethyl methacrylate (PMMA) impregnated with gentamicin. Post-molding manipulation was minimal, and dimensional accuracy was maintained. Postoperative computed tomography scans were used to assess implant fit and outcomes.

The cold injection technique produced consistent and accurate implants for all 15 patients. No dimensional variation was observed in the final implants. Postoperative CT scans showed excellent fit of the implants in cranial defects. The complication rate was low, indicating good clinical outcomes. The method required minimal post-molding manipulation. Reproducibility was higher compared to other implant types. The implants demonstrated high precision and accuracy in fit. The process reduced operator-dependent variability in implant fabrication.

The authors propose that the cold injection technique improves implant consistency and accuracy. This method reduces the need for post-molding adjustments. The study supports the reliability of this technique in cranioplasty. The findings suggest that this approach is more efficient than traditional methods. The use of 3D CAD and silicone molds enables accurate implant replication. The low complication rate supports the clinical viability of this method. The results indicate that this technique can be reliably used in clinical practice. The authors suggest that this method may be a valuable option for cranioplasty procedures.