PMID: 9649173Jul 2, 1998Paper

Distortion behavior of heat-activated acrylic denture-base resin in conventional and long, low-temperature processing methods

Journal of Dental Research
M KawaraK Nemoto

Abstract

There have been many reports on fatal distortion of heat-activated acrylic denture-base resin which is still widely used in the field of removable prosthodontics. However, these reports have failed to report quantitatively on polymerization and thermal shrinkage factors. In the present study, we attempted to verify that the shrinkage of heat-activated acrylic denture-base resin was caused mainly by thermal contraction after processing. Furthermore, we examined the degree of distortion resulting from long, low-temperature processing, and compared the results with that of the conventional method. The strain gauge and thermo-couple were embedded in a specimen at the time of resin packing. The measurement started from the beginning of processing and continued until the specimen was bench-cooled and immediately before and after it was de-flasked, as well as during seven-day immersion in water at 37 degrees C. The resin expanded when processed by the conventional method. Meanwhile, mild shrinkage, possibly polymerization shrinkage, was observed when the resin was processed by the low-temperature method. This suggested that polymerization shrinkage was compensated for by thermal expansion during processing by the conventional method. ...Continue Reading

References

Aug 1, 1989·The Journal of the American Dental Association·T TakamataM E Boone
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Citations

Dec 11, 2002·The Journal of Prosthetic Dentistry·Dalton Matos Rodrigues, João Rodrigues
Nov 26, 2015·Journal of Oral Biology and Craniofacial Research·Rafael L X ConsaniConrado R Caetano
Mar 13, 2009·Gerodontology·Rafael Leonardo Xediek ConsaniMário Alexandre Coelho Sinhoreti
Sep 19, 2012·Journal of Prosthodontics : Official Journal of the American College of Prosthodontists·Neeraja Turagam, Durga Prasad Mudrakola
Jun 22, 2010·Gerodontology·Mateus Bertolini Fernandes Dos SantosMarcelo Ferraz Mesquita
Oct 22, 2005·Dental Materials : Official Publication of the Academy of Dental Materials·Tomoyuki IkedaTakashi Ohyama
Apr 27, 2016·The Journal of Prosthetic Dentistry·Brian J GoodacreMathew T Kattadiyil
Nov 23, 2006·Brazilian Oral Research·Rafael Leonardo Xediek ConsaniMaurício Tanji
Jul 11, 2006·Journal of Prosthodontics : Official Journal of the American College of Prosthodontists·R L ConsaniS Consani
May 16, 2009·The Open Dentistry Journal·Wagner A NegreirosIvan R Faria
Dec 26, 2018·Journal of Prosthodontic Research·Akinori TasakaKaoru Sakurai
Aug 4, 2020·Journal of Prosthodontics : Official Journal of the American College of Prosthodontists·José BecerraJean-François Nguyen

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