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Mouthguard sheet temperature after heating under pressure former.

Fumi Mizuhashi1, Kaoru Koide1, Ryo Mizuhashi2

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Summary

Ethylene vinyl acetate (EVA) and polyolefin sheets show different temperature changes during mouthguard fabrication heating. EVA sheets result in thicker mouthguards compared to polyolefin, ensuring better thickness maintenance.

Keywords:
mouthguardpressure formationtemperature

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Dental Materials

Background:

  • Ethylene vinyl acetate (EVA) and polyolefin sheets are standard materials for fabricating custom-fit mouthguards.
  • Understanding thermal behavior during fabrication is crucial for consistent mouthguard properties.
  • Previous research has not fully clarified temperature variations in these sheets during heating.

Purpose of the Study:

  • To investigate the effect of sheet temperature changes during the heating process for mouthguard fabrication.
  • To compare the thermal behavior and resulting mouthguard properties between ethylene vinyl acetate and polyolefin sheets.

Main Methods:

  • Four-millimeter thick sheets of EVA and polyolefin were used.
  • Sheet temperatures were measured at displacements of 10, 15, and 20 mm after heating.
  • Sheets were pressure-formed at 100°C, and mouthguard thickness and fit were assessed.

Main Results:

  • Sheet temperatures increased with larger displacements for both materials (P < 0.01).
  • Significant temperature differences were observed between EVA and polyolefin at 10 and 15 mm displacements (P < 0.01).
  • EVA-formed mouthguards exhibited greater thickness at the incisor and molar regions compared to polyolefin (P < 0.01 and P < 0.05).

Conclusions:

  • Mouthguard sheet temperature changes differ significantly between ethylene vinyl acetate and polyolefin materials during heating.
  • Ethylene vinyl acetate sheets demonstrate superior ability to maintain mouthguard thickness under identical heating conditions compared to polyolefin.