The effect of various dentifrices on surface roughness and gloss of resin composites.
OBJECTIVE
The purpose of this study was to evaluate the effect of different levels of abrasiveness (RDA) of dentifrices on the gloss and surface roughness of resin composites after toothbrushing.


METHODS
Sixty disk-shaped composite specimens (D=10.0mm, 2-mm thick, n=15 per material) were made of: microfill (Durafill), nanofill (Filtek Supreme), minifill hybrid (Filtek 250), and nanohybrid (Premise). One side of each specimen was finished with a carbide bur and polished with Enhance and Pogo. Five specimens of each composite were randomly assigned to one of the dentifrices, Colgate Total (CT; RDA 70), Colgate baking soda & peroxide whitening (CBS; RDA 145), and Colgate tartar control & whitening (CTW; RDA 200). Surface gloss was measured with a glossmeter and surface roughness with a profilometer before and after toothbrushing with a 1:2 slurry (dentifrice/deionised water) at 5760 strokes in a brushing machine (approximately 1Hz). Results were analyzed by three-way ANOVA/Tukey's (p<0.05).


RESULTS
There was a significant reduction in gloss and increase in surface roughness after brushing with all dentifrices. There was no significant difference in gloss when Durafill was brushed with any dentifrice; the other composites showed less gloss reduction when brushed with CT. Durafill, Supreme and Premise did not show significantly different surface roughness results and CBS and CTW did not produce significantly different results.


CONCLUSIONS
Dentifrices of lower abrasivity promote less reduction in gloss and surface roughness for composites of different particle sizes after brushing. Composites containing smaller average fillers showed less reduction in gloss and less increase in surface roughness than ones with larger fillers.
da Costa
Juliana
J
Department of Restorative Dentistry, Division of Operative Dentistry, Oregon Health & Science University School of Dentistry, Portland, OR 97239, USA. dacostaj@ohsu.edu
Adams-Belusko
Anne
A
Riley
Kelly
K
Ferracane
Jack L
JL
D000704:Analysis of Variance; D003188:Composite Resins / Q000737:chemistry*; D019554:Dental Restoration Wear; D003793:Dental Restoration, Permanent; D003802:Dentifrices / Q000737:chemistry*; D011897:Random Allocation; D013499:Surface Properties; D014099:Toothbrushing / Q000379:methods*
D003188:Composite Resins; D003802:Dentifrices; C474035:Filtek Supreme; C444701:Filtek Z250; C507210:premise composite resin; C039734:Durafill