Surface characterization of current composites after toothbrush abrasion.
The present study was designed to evaluate the surface roughness and the gloss of current composites before and after toothbrush abrasion. We assessed forty dimensionally standardized composite specimens (n=8/group) from five composites: two nanohybrids (i. e., IPS Empress Direct Enamel and IPS Empress Direct Dentin), two microhybrids (i. e., Clearfil AP-X and Filtek Z250) and one organically modified ceramics (Admira). All of the specimens were polished with 4000-grid silicon carbide papers. Surface roughness was measured with a profilometer and gloss was measured with a glossmeter before and after powered toothbrush abrasion with a 1:1 slurry (dentifrice/tap water) at 12,000 strokes in a toothbrush simulator. There was a significant increase in the surface roughness and a reduction in gloss after toothbrush abrasion in all of the composites except Clearfil AP-X (p<0.05). Simple regression analysis showed that there was not an association between the surface roughness and the gloss (R(2)=0.191, p<0.001).
Cariology and Operative Dentistry, Department of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan. renatakahashi@hotmail.com
Rena
R
Takahashi
Jian
J
Jin
Toru
T
Nikaido
Junji
J
Tagami
Reinhard
R
Hickel
Karl-Heinz
KH
Kunzelmann
D003188:Composite Resins / Q000737:chemistry*; D003775:Dental Polishing; D019554:Dental Restoration Wear; D003802:Dentifrices / Q000009:adverse effects*; D008855:Microscopy, Electron, Scanning; D012044:Regression Analysis; D018709:Statistics, Nonparametric; D013499:Surface Properties; D014099:Toothbrushing / Q000009:adverse effects*
D003188:Composite Resins; D003802:Dentifrices