Quantitative and qualitative surface analysis of three resin composites after polishing - An in vitro study

Abstract

Aim: The study aims to measure the surface roughness (Ra) of three resin composites subsequent to polishing with diamond-impregnated polishing paste.

Materials and methods: Sixty specimens (10 mm × 2 mm) were prepared in metal molds using three nanocomposites: GC Sculpt, Filtek Z350 XT, and Tetric N Ceram. Specimens were then subjected to baseline roughening with #600 grit sandpaper and were polished with DirectDia paste according to the manufacturer's instructions. After polishing, the Ra of resin composites of all the specimens was measured using profilometer and the surfaces were seen under scanning electron microscope.

Results: Tetric N Ceram specimens were significantly smoother and had the least R_a value compared to other groups.

Conclusion: Among the three resin composites tested, Tetric N Ceram exhibited the least R_a value owing to the small size of inorganic filler particles.

Keywords: Composite resin; profilometer; surface roughness.

Graph 1

Ra: The mean ± SD is 0.1605 ± 0.017, 0.1126 ± 0.018, and 0.1329 ± 0.021 for GC Sculpt, Tetric N Ceram, and Filtek Z350, respectively. SD: Standard deviation, Ra: Roughness

Figure 2

Scanning electron microscopy. (a and b) GC Sculpt revealed heterogeneous surface with some matrix imperfections. (c and d) Filtek Z350 showed small heterogeneous surface texture with some voids and dislodgment. (e and f) Tetric N Ceram Reveled smooth surface and no particle dislodging was observed