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Effect of ethylene vinyl acetate (EVA) closed cell foam on transmitted forces in mouthguard material
B Westerman1, P M Stringfellow, J A Eccleston
1University of Queensland, 500 Sandgate Road, Clayfield 4001, Queensland, Australia. airgard@mgard.com.au
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.
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