Thickness and fit of mouthguards adjusted by notching thermoplastic sheets under different heating conditions.
Thickness and fit of mouthguards adjusted by notching thermoplastic sheets under different heating conditions.
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通过在不同加热条件下对热塑性片材进行切口来调整护齿套的厚度和贴合度。
DOI：
10.1111/edt.12143
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
Mutsumi Takahashi
中科院分区：
文献类型：
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作者：
F. Mizuhashi;K. Koide;Mutsumi Takahashi
本研究借由在热塑性共聚物乙烯醋酸乙烯酯（伊娃）片上开槽，然后加热至不同程度，来探讨护齿器的厚度与适合度。使用的材料是3.8毫米厚的运动护齿套。分别在距前后缘20 mm和距左右缘15 mm处切取长度为90 mm和80 mm的切口，制成伊娃片，并与原片进行比较。当片材被加热直到它们从基线悬挂1.5、2.0、2.5和3.0cm时，使用真空成型机形成片材。我们测量了中门齿和第一磨牙处护齿的厚度和贴合度。通过三因素方差分析，分析了根据测量部件、片材类型和加热条件的厚度和适合性的差异。测量部位和片型差异有显著性（P < 0.01），切口片保持所需厚度。测量部位之间和加热条件之间的拟合度存在差异（P < 0.01），但不受开槽的影响。当片材被加热到3.0 cm的悬挂距离时，护齿套贴合性是最佳的。这些结果表明，伊娃片材的厚度和贴合性可以通过将片材开槽并加热至3.0 cm的悬挂距离来保持。这些发现可用于制作合适的护齿。
This study examines the thickness and fit of mouthguards by notching thermoplastic copolymer ethylene vinyl acetate (EVA) sheets and then heating them to various degrees. The material used was a 3.8-mm-thick sports mouthguard. Notches with a length of 90 and 80 mm were cut into an EVA sheet 20 mm from the anterior and posterior margins and 15 mm from the right and left margins, respectively, and the sheet was compared with the original. The sheets were formed using a vacuum former when the sheets were heated until they hung 1.5, 2.0, 2.5, and 3.0 cm from the baseline. We measured the thickness and fit of the mouthguard at the central incisor and first molar. Differences in thickness and fit according to the measurement parts, sheet type, and heating conditions were analyzed by three-way anova. The measurement parts and sheet type significantly differed (P < 0.01), and the notched sheet maintained the required thickness. Fit differed among the measurement parts and by heating conditions (P < 0.01), but was not affected by the notching. The mouthguard fit was optimal when the sheets were heated to a hanging distance of 3.0 cm. These results suggest that the thickness and fit of the EVA sheet could be maintained by notching and heating the sheet to a hanging distance of 3.0 cm. These findings could be useful for fabricating appropriate mouthguards.