title: In vitro comparative fluoride release, and weight and volume change in light-curing and self-curing glass ionomer materials.
abstract: The purpose of this study was to evaluate and compare in vitro fluoride release from and weight and volume changes of Photac-Fil, a light-curing polymaleinate restorative glass ionomer, with Ketac-Fil, a self-curing glass ionomer, and Ketac-Silver, a metal reinforced glass ionomer. Five discs of each material, measuring 2 mm height and 5 mm diameter, were suspended in separate vials of distilled water and laboratory artificial saliva. Fluoride release into the solutions was measured using a calibrated fluoride-sensitive ion meter initially at 24 hr and then weekly from 1 to 9 weeks. These results were evaluated statistically using repeated measures analysis of variance. Volumes and weights were recorded at the start and end of the experiment and analyzed using the paired t-test. Photac-Fil released similar amounts of fluoride to Ketac-Silver, but significantly less than Ketac-Fil in distilled water (P < or = 0.05). In artificial saliva, Photac-Fil released similar amounts to Ketac-Fil, but significantly more than Ketac-Silver (P < or = 0.05). Photac-Fil volume increased in distilled water and artificial saliva (P < or = 0.05) as did Ketac-Fil and Ketac-Silver in artificial saliva (P < or = 0.05). The only material that demonstrated significant net weight increase was Ketac-Silver in artificial saliva (P < or = 0.05). In summary, differences in fluoride release between these three glass ionomer materials varied as a function of the media in which they were stored. Whereas Ketac-Fil exhibited significantly greater fluoride release than the other materials in distilled water, in artificial saliva Ketac-Fil and Photac-Fil exhibited comparable fluoride release. Dimensional change, as evaluated by volume and weight differences, was also affected by storage media.
authors.affiliation: University of Missouri-Kansas City School of Dentistry, USA.
authors.forename: A
authors.initials: A
authors.lastname: Wandera
authors.forename: P
authors.initials: P
authors.lastname: Spencer
authors.forename: B
authors.initials: B
authors.lastname: Bohaty
mesh_terms: D000704:Analysis of Variance; D002122:Calcium Chloride / Q000032:analysis / Q000737:chemistry; D016722:Cermet Cements / Q000737:chemistry; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003793:Dental Restoration, Permanent; D005069:Evaluation Studies as Topic; D005459:Fluorides / Q000032:analysis / Q000737:chemistry*; D005899:Glass Ionomer Cements / Q000737:chemistry*; D008027:Light; D008298:Maleates / Q000737:chemistry; D008422:Materials Testing; D010756:Phosphoric Acids / Q000032:analysis / Q000737:chemistry; D012117:Resins, Synthetic / Q000737:chemistry; D012464:Saliva, Artificial / Q000032:analysis / Q000737:chemistry; D017693:Sodium Bicarbonate / Q000032:analysis / Q000737:chemistry; D014867:Water
chemical_list: D016722:Cermet Cements; D005899:Glass Ionomer Cements; D008298:Maleates; D010756:Phosphoric Acids; C081144:Photac-Fil; D012117:Resins, Synthetic; D012464:Saliva, Artificial; D014867:Water; C040964:Ketac-Fil; D017693:Sodium Bicarbonate; C030242:phosphoric acid; D002122:Calcium Chloride; D005459:Fluorides