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Effect of ethylene vinyl acetate (EVA) closed cell foam on transmitted forces in mouthguard material

2002; BMJ; Volume: 36; Issue: 3 Linguagem: Inglês

10.1136/bjsm.36.3.205

1473-0480

B. Westerman, P. M. Stringfellow, J. A. Eccleston, D. Harbrow,

Restraint-Related Deaths

Objectives: To compare transmitted forces through ethylene vinyl acetate (EVA) mouthguard material and the same EVA material with gas inclusions in the form of a closed cell foam. Method: EVA mouthguard materials with and without foam gas inclusions and 4 mm thick were impacted with a constant force from an impact pendulum. Various porosity levels in the foam materials were produced by 1%, 5%, and 10% by weight foaming agent. The forces transmitted through the EVA after energy absorption by the test materials were measured with a force sensor and compared. Results: Only minor non-significant differences in transmitted forces through the EVA with and without foam were shown. Conclusions: The inclusion of gas in the form of a closed cell foam in 4 mm thick EVA mouthguard materials did not improve the impact performance of the EVA mouthguard material.