Biomechanical substrate models for testing osteosynthesis screw

Abstract

Experimental analyzes on bio-models can investigate biomechanical parameters, mainly, when models are able to simulate the facial skeleton. The aim of this study was to compare and correlate the density by micro-computerized tomography and drilling resistance of three differents bio-models or substrates (polyurethane foam block, femur bovine and swine ribs) when insert osteosynthesis screw. The substrate blocks density were analyzed using X-ray microtomography (microCT) and the final insertion torque was analyzed using a surgical motor. Results: Group 1 (femur bovine) obtained the highest values of density and Group 3 (Polyurethane foam 40 pcf) that showed the lowest value of density. Regarding the final Torque insertion values, Group 1 (femur bovine) and Group 3 (Polyurethane foam 40 pcf) showed higher results than Group 2 (swine ribs), with a statistical difference. Conclusion: The polyurethane blocks with a density of 40 PCF showed final insertion torque similar to the bovine femur blocks, demonstrating that they are bone substitutes suitable for screw insertion tests.