title: A comparison of cohesive strength and stiffness of Resilon and gutta-percha.
abstract: The purpose of this study was to compare the cohesive strength and stiffness of Resilon and gutta-percha under dry conditions and after 1 month of water storage to determine if they are stiff enough to reinforce roots. Dog-bone shaped specimens were created and pulled to failure at 3 mm/min in a Vitrodyne universal tester. The apparent modulus of elasticity, percent elongation, and yield stress were measured. Cohesive strength was defined as the yield stress. The data were analyzed using a two-way ANOVA for each outcome (alpha = 0.05). The results of this study show that the cohesive strength (that is the tensile stress when they begin to flow or break) and modulus of elasticity (or stiffness) of gutta-percha and Resilon are relatively low. Although the results showed statistically significant differences between the physical properties of gutta-percha and Resilon under varied conditions, these differences were not clinically significant. In conclusion, the stiffness of Resilon and gutta-percha is too low to reinforce roots after root canal therapy.
authors.affiliation: Department of Endodontics, School of Dentistry, Medical College of Georgia, Augusta, Georgia 30912-1244, USA.
authors.forename: Chad
authors.initials: C
authors.lastname: Williams
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Loushine
authors.forename: R Norman
authors.initials: RN
authors.lastname: Weller
authors.forename: David H
authors.initials: DH
authors.lastname: Pashley
authors.forename: Franklin R
authors.initials: FR
authors.lastname: Tay
mesh_terms: D000704:Analysis of Variance; D004548:Elasticity; D006171:Gutta-Percha / Q000737:chemistry*; D012387:Root Canal Filling Materials / Q000737:chemistry*; D014867:Water / Q000009:adverse effects
chemical_list: D012387:Root Canal Filling Materials; C486892:resilon sealer; D014867:Water; D006171:Gutta-Percha