Comparison of the effect of stannous fluoride and sodium fluoride on surface roughness of silorane and methacrylate based restorative material using light polarizing microscope

Abstract EN

Background : Long-term fluoride application on the teeth of patients receiving radiation therapy for head and neck tumors results in excessive roughening of composite restorations.

This in vitro study confirmed to compare the surface roughness and surface morphology of two different fluoride treatments on two dental composites containing different resin matrix by simulating one year of clinical exposure for 10 minutes per day.

Material and methods : Forty specimens of Filtek™ P90 (3M ESPE, USA) and Filtek™ Supreme XT (3M ESPE, USA) of (12 mm diameter and 3mm height) were prepared ..

All specimens were polished with Sof-Lex disks(3M ESPE, USA).

All specimens were brushed for 3 minutes with a soft-bristle tooth brush and mild dentifrice (control group).

Each composite specimens were immersed in one of the two fluoride gels 0.4 % SnF2, or 1.1 % NaF (Alpha-dent, USA) for 10 days, 10 minutes per day (n=10).

All specimens were subjected to surface roughness test before and after fluoride application by profilometer and evaluated using light polarizing microscope.

NOVA and Student t-test were used to analyze the surface roughness value.

Results : The Feltik™ supreme XT specimens showed significantly higher surface roughness value (Ra) than Feltik™P90 before fluoride treatment (P<0.05).

After both fluoride treatments composite disks of both types exhibited significantly higher surface roughness values (P<0.01).

Both composite specimens presented significantly higher surface roughness when treated with 0.4 % SnF2 as compared to NaF (P<0.05) Conclusions : Topically applied fluorides induced adverse effects on the morphologic characteristics and composition of flat, polished composite surfaces.

Daily application of 0.4 % SnF2 could be alternated with courses of 1.1 % NaF which appears to be less damaging.

Zirconium-containing products are sensitive to stannous fluoride.

Compared to methacrylate-based restorative materials, the new Silorane-based material had better topographical performance.