title: Young's modulus of warm and cold gutta-percha.
abstract: The purpose of this study was to evaluate the Young's modulus of cold and warm gutta-percha. Rods of gutta-percha. Specially designed by three companies were tested at 20 degrees C and 55 degrees C with a tensile testing machine. The Young's modulus, the yield strength and the percentage of deformation were automatically recorded. There was a statistically significant difference, for the three criteria, between the cold and warm gutta-percha. Warm gutta-percha presented a Young's modulus 100 times smaller, a yield strength 2 times smaller but a percentage of permanent deformation 10 times higher than cold gutta-percha. Gutta-percha Hygenic presented the best characteristics.
authors.affiliation: Department of Restorative Dentistry and Endodontics, University of Marseille, France.
authors.forename: J J
authors.initials: JJ
authors.lastname: Camps
authors.forename: W J
authors.initials: WJ
authors.lastname: Pertot
authors.forename: J Y
authors.initials: JY
authors.lastname: Escavy
authors.forename: M
authors.initials: M
authors.lastname: Pravaz
mesh_terms: D000704:Analysis of Variance; D003080:Cold Temperature; D004548:Elasticity; D006171:Gutta-Percha / Q000737:chemistry*; D006244:Hardness; D006358:Hot Temperature; D008422:Materials Testing; D013816:Thermodynamics
chemical_list: D006171:Gutta-Percha