Objective: Aim of this study was to evaluate the effect of different finishing and polishing procedures on surface roughness of a microfilled (Amaris, Voco) and a nanofilled (Clearfil Majesty Esthetic, Kuraray) resin composite material.
Methods: Thirty five specimens of each material were prepared in a plexiglass mold (10 mm in diameter x 2 mm in thickness) and randomly divided into seven finishing and polishing procedures as follows (n=5):
Procedure 1: Mylar strip (control),
Procedure 2: Tungsten carbide burs (12 + 30 blades; respectively) (Axis Dental),
Procedure 3: Diamond burs (Fine, extra fine, ultrafine; respectively) (Meisinger),
Procedure 4: Procedure 2 + Diamond micro-polisher (PoGo, Dentsply/Caulk),
Procedure 5: Procedure 2 + Polishing discs (Super-snap, Shofu),
Procedure 6: Procedure 3 + Diamond micro-polisher (PoGo),
Procedure 7: Procedure 3 + Polishing discs (Super-snap).
Average surface roughness (Ra) in micrometers (µm) was measured using a surface roughness tester (Mahr Perthometer S4P,Germany). Data were analyzed using two way ANOVA and Duncan test (p< 0.05).
Results: Nanofilled composite showed significantly lower Ra values than microfilled composite in procedures 4,6 and 7 (p<0,05). In other procedures there were no significant differences among composites (p>0,05). For nanofilled composite regardless of finishing method polishing with diamond micro-polisher showed similar surface roughness values when compared with Mylar strip (p >0.05). When polishing systems were compared diamond micro-polisher produced smoother surfaces for two tested composites than polishing discs (P <0.05).
| Roughness (Ra), µm Mean(SE) | ||||||
Procedure | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
Amaris | 0,042(0,003)Ea | 0,197(0,005)Ba | 0,222(0,008)Aa | 0,079(0,006)Da | 0,110(0,003)Ca | 0,091(0,009)Da | 0,122(0,004)Ca |
Majesty | 0,043(0,003)Ca | 0,221(0,012)Aa | 0,227(0,008)Aa | 0,055(0,007)Cb | 0,097(0,006)Ba | 0,055(0,004)Cb | 0,102(0,008)Bb |
Same superscript letters indicate no statistically significant difference (p > 0.05). Upper cases compare data in the same row, lower cases in the same column. | |||||||
Conclusions: It may be concluded that; regardless of finishing methods, diamond micro-polisher produced smoother surfaces than polishing discs.