Effect of polishing on surface roughness and surface-free energy of direct tooth-colored restorative materials
10.3760/cma.j.issn.1002-0098.2011.s1.019
- VernacularTitle:抛光对直接修复用牙色材料粗糙度及表面能的影响
- Author:
Chong-Yang YUAN
1
;
Xiao-Yan WANG
;
Xue-Jun GAO
Author Information
1. 北京大学口腔医学院(口腔医院)
- Keywords:
Direct tooth-colored restorative materials;
Surface roughness;
Surface free energy:Polishing
- From:
Chinese Journal of Stomatology
2011;46(z1):80-83
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate the effects of polishing on surface roughness (Ra) and surfacefree energy (SFE) of three direct tooth-colored restorative materials.Methods Three direct tooth-colored restorative materials,composite resin(CR) ( Filtek Z350,3M ESPE,America),pre-reacted glass ionomer (Giomer) ( Beautifil Ⅱ,Shofu,Japan) and resin-modified glass ionomer ( RMGIC ) ( Fuji Ⅱ LC,GC,Japan),were placed in cuboidal models (8 mm × 8 mm × 2 mm),covered with mylar film and light-cured.The samples ( n =14) were polished with coarse,medium,fine and superfine instruments in series ( grit 60 μm→grit 30 μm→grit 20 μm→grit 7 μm).Surface roughness (Ra,μm) was determined with a profilometer.Surface contact angles (CA) with Glycerol,Ethylene glycol and distilled water were measured using an image acquisition system and surface-free energy was calculated.Ra and SFE of different materials before and after polishing were compared by SPSS one-way ANOVA (LSD/Dunnett T3 ).Results Before polishing,Ra and SFE of CR [ (0.098 ±0.019) μm,(31.78 ±2.14) mN · m-1] and Giomer [ (0.093 ±0.020) μm,(32.63 ±2.12) mN · m-1] were both lower than those of RMGIC [ (0.134 ±0.019) μm,(40.22 ± 1.05 ) mN · m- 1 ].After polishing,all three materials showed increased Ra,and there were significant differences among three materials(P ＜0.05):CR[ (0.141 ±0.018) μm] ＜ Giomer [ (0.185 ±0.013) μm] ＜ RMGIC [ (0.494 ± 0.075) μm].However,all three materials showed decreased γSTOT after polishing.There was significantly different among the materials ( P ＜ 0.05 ):Giomer [ ( 26.60 ±5.61) mN·m-1] ＜ CR [(29.16±5.73) mN· m-1] ＜ RMGIC [(32.30±3.83) mN · m-1].Conclusions The surface roughness and surface free energy were material type and polishing technique dependent.
