title: Effect of thermocycling on tensile strength and tear resistance of four soft denture liners.
abstract: This study evaluated the effect of thermocycling on the tensile strength and tear resistance of four long-term soft denture liners. One light-activated (Astron Light, AL), two chemically activated (GC Reline Soft, GC; Silagum Comfort, SC), and one heat-cured (Molloplast-B, MLP) soft liner materials were tested. Dumbbell and trouser-leg specimen geometries were used for tensile strength and tear resistance tests, respectively. A total of 120 specimens were prepared. Test specimens for each material (n=5) were subjected to thermal cycling for 1000 and 3000 cycles between 5 degrees C and 55 degrees C in a thermocycler. Before thermocycling, AL gave the lowest tensile strength, while SC exhibited the highest tear resistance value among the materials tested (p < 0.05). Thermal cycling significantly affected the tensile strength of AL as well as the tear resistance values of AL, MLP, and GC materials. This in vitro study revealed that the tensile strength and tear resistance values of the soft liner materials tested varied according to their chemical compositions.
authors.affiliation: Gazi University, Faculty of Dentistry, Department of Prosthodontics, Ankara, Turkey. serraoguz@hotmail.com
authors.forename: Serra
authors.initials: S
authors.lastname: Oguz
authors.forename: Mustafa Murat
authors.initials: MM
authors.lastname: Mutluay
authors.forename: Orhan Murat
authors.initials: OM
authors.lastname: Dogan
authors.forename: Bulent
authors.initials: B
authors.lastname: Bek
mesh_terms: D003799:Dental Stress Analysis; D003822:Denture Liners; D006358:Hot Temperature; D008422:Materials Testing; D013718:Tensile Strength