Abstract
Purpose: This study aims to provide a systematic evaluation of the EVA application in orofacial protectors while focusing on sports. Design/methodology/approach: The research comprises a numerical analysis. During experimental tests, EVA was analysed in special more specific studies about its influence on the mechanical behaviour of EVA were performed. In the numerical analyses of the EVA orofacial protector, the studies focused on its effect in the zygomatic bone protection, in a simplified geometry. Findings: According to the experimental and numerical results from a systematic study of EVA, its application to orofacial protection can be considered satisfactory. Research limitations/implications: The limitations for this research is the complex geometry of the face, number of materials and parameters involved in this study. Practical implications: For facial protection, a better performance is obtained with a combination of rigid and soft EVA material. Particularly for the zygomatic bone, a 3 mm thick plate of soft EVA overlapped by a 1 mm thick plate of rigid EVA is indicated. Originality/value: The studies made for this researchers group show that the EVA use in facial protection for sports is effective.
Highlights
According to the World Health Organization (WHO) [1], “Health is a state of complete physical, mental and social well-being and not merely the absence of disease or infirmity.”Areas of study related to life, health and disease are called human health sciences
Ethylene-vinyl acetate (EVA), object of this study, is a thermoplastic copolymer derived from petroleum
Studies in the biological area involving impact have become impossible to perform in vivo due to ethical awareness
Summary
According to the World Health Organization (WHO) [1], “Health is a state of complete physical, mental and social well-being and not merely the absence of disease or infirmity.”. Ethylene-vinyl acetate (EVA), object of this study, is a thermoplastic copolymer derived from petroleum For dental use, it is in the form of rigid or flexible flat plates, in thicknesses of 1–5 mm, without the presence of blowing agents, differently from EVA plates available in the common market. It is in the form of rigid or flexible flat plates, in thicknesses of 1–5 mm, without the presence of blowing agents, differently from EVA plates available in the common market It is indicated as a shock absorber material, for producing mouth and facial protectors for sports practice, as pointed out by Coto et al [6], as well as dental bleaching trays, orthodontic restraints and as the base for facial prostheses
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