Auricular reconstruction remains one of the biggest challenges faced by plastic surgeons. Reconstruction with autologous cartilage has proven to offer a lasting reconstruction with acceptable cosmetic results when performed by very experienced surgeons; however, the learning curve is long and few surgeons around the world have mastered this technique. For less experienced surgeons clinical outcome is frequently wanting; moreover, reconstructions with autologous cartilage carry its own burden of donor site morbidity and surgical complications. In order to reduce operating time, avoid the risks and complications inherent of cartilage harvest and homogenize clinical outcome of ear reconstruction, auricular off the shelf scaffolds have been manufactured using biomaterial.
The only auricular scaffold present in the market today is made of high density porous polyethylene and commercialized under the trade name Medpor®. Despite its limited success porous polyethylene has not fully convinced surgeons due to its stiffness and extrusion rates. A novel nanocomposite polymer has been developed by Prof. Seifalian and its team at UCL by the incorporation of polyhedral oligomeric silsesquioxane (POSS) nanocage as pendant side chains into poly (carbonate-urea) urethane. POSS PCU can be shaped as an auricle, it mimics the elastic properties of auricular native cartilage and supports cell growth and proliferation. In this project we have used human dermal fibroblasts primary cells (HFF) to study and compare cellular response on POSS PCU and Medpor®.
In vitro experiments detected significantly higher cell adhesion on POSS PCU when compared to Medpor® (p < 0,05). Dynamic condition at 50 RMP was found reduce cell attachment on both polymers; under this condition POSS PCU supports higher cell adhesion than Medpor®. Even though no difference on cell proliferation or metabolic activity per cell was found between the two polymers, POSS PCU, with higher cell adhesion, have higher overall cell proliferation and metabolic activity.
Collagen production per cell was found to be significantly increased on Medpor®; however, the higher cell number found on POSS PCU managed to produce as much total collagen as its counterpart. Even though POSS PCU is non-degradable, HFF were found to lower POSS PCU young’s modulus and make the scaffolds more flexible. Even though further refinement of POSS PCU scaffold production and the need for additional in vitro and in vivo studies, this biomaterial is a promising alternative for auricular reconstruction.
Citación recomendada (normas APA)
Carlos Enrique Ramírez Blanco, "Auricular reconstruction with a nanocomposite polymer = Reconstrucción auricular con un nanopolimero", -:-, 2012. Consultado en línea en la Biblioteca Digital de Bogotá (https://www.bibliotecadigitaldebogota.gov.co/resources/2084007/), el día 2025-04-04.
