Effect of APF Minute-Foam on the surface roughness, hardness, and micromorphology of high-viscosity glass ionomers.
OBJECTIVE
The purpose of the study was to evaluate the effect of Oral-B APF Minute-Foam on the surface roughness, hardness and morphology of high-viscosity glass-ionomer cements (GICs).


METHODS
The GICs used were Fuji IX GP and Ketac-Molar. The controls were Vitremer resin-modified GIC and Fuji II conventional GIC. All materials were mixed to a restorative consistency. The encapsulated GICs were mixed with a Rotomix for 10 seconds. For each GIC, 14 specimens (6 mm in diameter and 3 mm thick) were made with a Teflon mold and a fresh mix for each sample. The specimens were allowed to set at room temperature for 15 minutes, and then stored in water at room temperature for 48 hours. Profilometry and microhardness measurements (Knoop) were obtained on the untreated specimens as baseline data. The specimens were then rinsed with water, gently air-dried and 1.23% APF Minute-Foam was applied for 1 minute with a brush, rinsed with water, gently air-dried, and hardness and roughness remeasured. In another set, similar measurements were obtained as before but after a 4 minute application of the APF foam. In a different set similar measurements were obtained as before but after a simulated 2-year application of the APF foam. The data were statistically analyzed using an ANOVA. The Student-Newman-Keuls method and Bonferroni tests (P=.05) were used for multiple comparisons of the means. The SEM was used to evaluate the APF effects on the surface micromorphology of the materials.


RESULTS
Foam application time had no statistically significant effect on the surface roughness of Ketac-Molar and Vitremer. Fuji IX GP showed that 1 and 4 minute applications had lower values than after 2 years. Fuji II revealed similar roughness for the control at 1 and 4 minutes, but higher values after 2 years. Fuji IX GP proved no significant difference in hardness after the different application times. Ketac-Molar demonstrated less hardness than the control at 1 and 4 minutes but higher after 2 years. Foam application time had no statistically significant effect on the surface hardness of Vitremer. Fuji II showed 1 minute had harder values than 4 minutes and 2 years; the control was harder than 2 years.


CONCLUSIONS
The SEM observations revealed that surface micromorphology was not significantly affected by the use of the Oral-B APF Minute-Foam. Treatment with the APF foam tested may be material dependent. It seems to be preferable to apply them for shorter times (1 minute versus 4 minutes) to reduce any adverse effect.
García-Godoy
Franklin
F
Biomaterials Research Center, College of Dental Medicine, Nova Southeastern University, Fort Lauderdale, Fla, USA.
García-Godoy
Alexander
A
García-Godoy
Franklin
F
D000149:Acidulated Phosphate Fluoride / Q000737:chemistry*; D000704:Analysis of Variance; D002327:Cariostatic Agents / Q000737:chemistry*; D003188:Composite Resins / Q000737:chemistry; D005899:Glass Ionomer Cements / Q000737:chemistry*; D006244:Hardness; D006801:Humans; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D019279:Resin Cements / Q000737:chemistry; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D014783:Viscosity; D014867:Water / Q000737:chemistry
D002327:Cariostatic Agents; D003188:Composite Resins; C439808:Fuji IX GP Fast; D005899:Glass Ionomer Cements; D019279:Resin Cements; C084550:Vitremer; C110712:ketac-molar; D014867:Water; C084541:Fuji glass-ionomer lining cement; D000149:Acidulated Phosphate Fluoride