Variation in mouthguard thickness according to heating conditions during fabrication Part 2: sheet shape and effect of thermal shrinkage

Dental Traumatology : Official Publication of International Association for Dental Traumatology
Mutsumi Takahashi, Kaoru Koide

Abstract

The aim of this study was to investigate the influence of the thermal shrinkage to thickness of the mouthguard with the heating method by the setting position of a sheet and the working model using an ethylene vinyl acetate sheet prepared by extrusion. Mouthguards were fabricated with EVA sheets (4.0 mm thick) using a vacuum-forming machine. Two forming conditions were compared: the square sheet was pinched by the clamping frame attached to the forming machine (S); and the round sheet was pinched at the top and bottom and stabilized by the circle tray (R). The sheet was aligned to make the sheet's extrusion direction vertical (V) or parallel (P) to the midline of the working model. The following two heating conditions were compared: (i) the sheet was molded when it sagged 15 mm below the level of the sheet frame measured at the top of the post in condition S (S-0), or that sagged 10 mm in condition R (R-0) in the usual position; (ii) the sheet frame was lowered by 50 mm from the ordinary height (S-50, R-50). Postmolding thickness was determined using a measuring device. Measurement points were the incisal and molar portion. Differences in the change of thickness of mouthguards molded under different heating conditions and extru...Continue Reading

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Citations

Feb 3, 2016·Dental Traumatology : Official Publication of International Association for Dental Traumatology·Mutsumi TakahashiShin-Ichi Iwasaki
Dec 14, 2016·Dental Traumatology : Official Publication of International Association for Dental Traumatology·Mutsumi TakahashiShin-Ichi Iwasaki
Mar 16, 2017·Dental Traumatology : Official Publication of International Association for Dental Traumatology·Mutsumi TakahashiShin-Ichi Iwasaki
Jun 27, 2020·Dental Traumatology : Official Publication of International Association for Dental Traumatology·Mutsumi Takahashi, Yogetsu Bando
Mar 31, 2019·Dental Traumatology : Official Publication of International Association for Dental Traumatology·Mutsumi Takahashi, Yogetsu Bando
May 22, 2021·Dental Traumatology : Official Publication of International Association for Dental Traumatology·Laura Sliwkanich, Aviv Ouanounou
Aug 14, 2021·British Dental Journal·B Wilson, L Hemm

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