title: Flexural properties of eight flowable light-cured restorative materials, in immediate vs 24-hour water storage.
abstract: This study evaluated the flexural strength, flexural modulus, modulus of resilience and water sorption of eight flowable light-cured restorative materials compared with two conventional restoratives (as control). Forty specimens of each material were made. Twenty specimens were immediately flexural tested, while the remaining 20 were weight-measured and immersed in distilled water in a 37 degrees C incubator. After 24 hours, the samples were weight-measured again to identify water sorption and they were flexural tested. The findings were statistically analyzed using t-test, one-way ANOVA, Tukey test and Pearson's Product-Moment Correlation. The results of the flexural strength test were also analyzed using Weibull statistic. All flowable light-cured restorative materials except Palfique Estelite Low Flow exhibited immediate flexural strength values between the conventional ones. All flowable light-cured restorative materials showed 24-hour flexural strength values between the conventional ones. The Weibull modulus for immediate flexural strength of the materials varied from 6.37 to 15.23, while for 24-hour flexural strength, the strength varied from 8.10 to 14.30. In both conditions, all flowable light-cured resin composites showed lower flexural moduli but higher modulus of resilience than the conventional ones. The water sorption of all resin composites was lower than the flowable light-cured compomer. There was a distinct relation (r=-0.84, p<0.01) between the increasing ratio in modulus of resilience and the amount of water sorption.
authors.affiliation: Department of Biomaterials, Okayama University Graduate School of Medicine and Dentistry, Okayama, Japan.
authors.forename: Rosalina
authors.initials: R
authors.lastname: Tjandrawinata
authors.forename: Masao
authors.initials: M
authors.lastname: Irie
authors.forename: Kazuomi
authors.initials: K
authors.lastname: Suzuki
mesh_terms: D000042:Absorption; D000327:Adsorption; D003188:Composite Resins / Q000737:chemistry*; D003793:Dental Restoration, Permanent; D004548:Elasticity; D006801:Humans; D008422:Materials Testing; D018583:Pliability; D019279:Resin Cements / Q000737:chemistry; D013314:Stress, Mechanical; D013997:Time Factors; D014867:Water / Q000737:chemistry
chemical_list: D003188:Composite Resins; C488280:Metafil Flo; D019279:Resin Cements; C102735:Revolution (composite resin); C407402:Unifil Bond; C476993:dyract flow; C111840:flowable hybrid composite; C086113:palfique estelite; C452226:tetric flow composite resin; D014867:Water; C065770:Herculite XR; C074741:Silux Plus