The influence of working cast residual moisture and temperature on the fit of vacuum-forming athletic mouth guards

Yuri Yonehata, Yoshinobu Maeda, Hiroyuki Machi, Ronald Sakaguchi

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Statement of problem. The comfort and effectiveness of athletic mouth guards are believed to depend on their degree of fit to oral tissues. Vacuum-forming machines are simpler and less expensive than pressure-forming machines. However, it is thought that vacuum-formed mouth guards often do not exhibit adequate adaptation. Purpose. The purpose of this study was to evaluate the effects of cast residual moisture and temperature on the fit of athletic mouth guards made with a vacuum-forming machine. Material and methods. A metal master model simulating the cross section of the maxillary molar region was used to form 20 working plaster casts. The casts represented 4 (5 specimens each) conditions before the forming of the mouth guard specimens: storing in a wet environment at room temperature and storing in a dry environment at room temperature, 5°C, and 40°C. Mouth guard specimens were fabricated with ethylene vinyl acetate sheets (3.8-mm thick) with the use of a vacuum-forming machine. Test casts were created by pouring hand-mixed type III dental stone into each of the mouth guard specimens. The differences in the sagittal cross-sectional heights at the line angle area of the test casts and the working casts were compared. This was achieved by superimposing their 3-dimensional images scanned by a laser scanner. The air permeability was also measured for the hand-mixed stone casts under wet and dry conditions, the vacuum-mixed stone cast, and the high-strength stone specimen. This was achieved by measuring the volume of transmitted air passing through the specimen in the testing tube. One-way analysis of variance with the Scheffé post hoc test (P

Original languageEnglish (US)
Pages (from-to)23-27
Number of pages5
JournalJournal of Prosthetic Dentistry
Volume89
Issue number1
DOIs
StatePublished - Jan 2003

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Mouth Protectors
Vacuum
Sports
Temperature
Air
Surgical Casts
Permeability
Analysis of Variance
Tooth
Lasers
Metals
Pressure

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

The influence of working cast residual moisture and temperature on the fit of vacuum-forming athletic mouth guards. / Yonehata, Yuri; Maeda, Yoshinobu; Machi, Hiroyuki; Sakaguchi, Ronald.

In: Journal of Prosthetic Dentistry, Vol. 89, No. 1, 01.2003, p. 23-27.

Research output: Contribution to journalArticle

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