title: Compressive fatigue limit of four types of dental restorative materials.
abstract: The purpose of this study was to evaluate the quasi-static compressive strength and the compressive fatigue limit of four different dental restorative materials, before and after aging in distilled water for 30 days. A conventional glass ionomer cement (Fuji IX GP; IG), a zinc-reinforced glass ionomer cement (Chemfil rock; CF), a light curable resin-reinforced glass ionomer cement (Fuji II LC; LC) and a resin-based composite (Quixfil; QF) were investigated. Cylindrical specimens (4mm in diameter and 6mm in height) were prepared according to the manufacturer׳s instructions. The compressive fatigue limit was obtained using the staircase method. Samples were tested in distilled water at 37°C, at a frequency of 10Hz with 10(5) cycles set as run-out. 17 fatigue samples were tested for each group. Two-way ANOVA and one-way ANOVA followed by Tukey׳s post-hoc test were used to analyze the results. Among the four types of materials, the resin-based composite exhibited the highest compressive strength (244±13.0MPa) and compressive fatigue limit (134±7.8MPa), followed by the light-cured resin reinforced glass ionomer cement (168±8.5MPa and 92±6.6MPa, respectively) after one day of storage in distilled water. After being stored for 30 days, all specimens showed an increase in compressive strength. Aging showed no effect on the compressive fatigue limit of the resin-based composite and the light-cured resin reinforced glass ionomer cement, however, the conventional glass ionomer cements showed a drastic decrease (37% for IG, 31% for CF) in compressive fatigue limit. In conclusion, in the present study, resin modified GIC and resin-based composite were found to have superior mechanical properties to conventional GIC.
authors.affiliation: Applied Materials Science, Department of Engineering Science, Uppsala University, Uppsala, Sweden.
authors.forename: Song
authors.initials: S
authors.lastname: Chen
authors.affiliation: Applied Materials Science, Department of Engineering Science, Uppsala University, Uppsala, Sweden.
authors.forename: Caroline
authors.initials: C
authors.lastname: Öhman
authors.affiliation: Department of Restorative Dentistry, Kornberg School of Dentistry/Temple University, Philadelphia, PA, United States.
authors.forename: Steven R
authors.initials: SR
authors.lastname: Jefferies
authors.affiliation: Department of Restorative Dentistry, Kornberg School of Dentistry/Temple University, Philadelphia, PA, United States.
authors.forename: Holly
authors.initials: H
authors.lastname: Gray
authors.affiliation: Applied Materials Science, Department of Engineering Science, Uppsala University, Uppsala, Sweden. Electronic address: wei.xia@angstrom.uu.se.
authors.forename: Wei
authors.initials: W
authors.lastname: Xia
authors.affiliation: Applied Materials Science, Department of Engineering Science, Uppsala University, Uppsala, Sweden.
authors.forename: Håkan
authors.initials: H
authors.lastname: Engqvist
mesh_terms: D000704:Analysis of Variance; D003188:Composite Resins; D019245:Compressive Strength; D003764:Dental Materials; D005899:Glass Ionomer Cements; D008422:Materials Testing; D019279:Resin Cements
chemical_list: D003188:Composite Resins; D003764:Dental Materials; D005899:Glass Ionomer Cements; D019279:Resin Cements
keywords: Aging; Compressive; Dental restorative materials; Fatigue