PMID: 8957779Dec 1, 1996Paper

Dimensional accuracy of thermoformed polymethyl methacrylate

The Journal of Prosthetic Dentistry
Robert G Jagger

Abstract

Thermoforming of polymethyl methacrylate sheet is used to produce a number of different types of dental appliances. The purpose of this study was to determine the dimensional accuracy of thermoformed polymethyl methacrylate specimens. Five blanks of the acrylic resin were thermoformed on stone casts prepared from a silicone mold of a brass master die. The distances between index marks were measured both on the cast and on the thermoformed blanks with an optical comparator. Measurements on the blanks were made again 24 hours after processing and then 1 week, 1 month, and 3 months after immersion in water. Linear shrinkage of less than 1% (range 0.37% to 0.52%) was observed 24 hours after removal of the blanks from the cast. Immersion of the thermoformed specimens in water resulted in an increase in measured dimensions, but after 3 months' immersion these increases were still less than those of the cast (range 0.07% to 0.18%). It was concluded that it is possible to thermoform Perspex polymethyl methacrylate accurately.

References

Dec 1, 1980·Journal of Dentistry·G D StaffordR W Handley
Aug 1, 1959·The Journal of the American Dental Association·J B WOELFEL, G C PAFFENBARGER

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Citations

Oct 5, 2010·American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics·Alexander D VardimonTamar Brosh
Mar 13, 2003·Journal of Oral Rehabilitation·R G JaggerR W Vowles
Sep 19, 2012·Journal of Prosthodontics : Official Journal of the American College of Prosthodontists·Neeraja Turagam, Durga Prasad Mudrakola

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