Surface roughness and morphology of resin composites polished with two-step polishing systems

Abstract

The purpose of this study was to investigate surface roughness (Ra) and morphology of supra-nanofilled [Estelite Omega (EO), Estelite ∑ Quick (EQ)], micro-hybrid [Esthet.X HD (EHD), G-aenial (GAE)] and nano-hybrid [Clearfil Majesty Posterior (CMP), Charisma Diamond (CD), Beautifil II (BII)] composites polished with two-step polishing systems [Enhance/PoGo (EP); Venus Supra (VS)]. Composite discs, 30 of each type, were prepared. Each composite group was divided into three subgroups: Mylar (control), EP and VS. Ra was evaluated with profilometer. In each composite group, the control had the lowest Ra. With both polishing systems, EO and EQ had significantly the lowest Ra, whereas CMP and BII had the highest. Except for GAE, CD and BII, the differences in Ra between EP and VS in each composite group were significant, showing smoother surfaces for EP. Supra-nanofilled composites created smoother surfaces than nano-hybrids, and their performance was similar or slightly better than that of micro-hybrids.

Can Reduced‐Step Polishers Be as Effective as Multiple‐Step Polishers in Enhancing Surface Smoothness?

“…In a study by Endo and colleagues, the polishing effect of the Venus Supra polisher on several nano‐hybrid composites was evaluated with SEM and it was observed that there were some dislodged large filler particles along with superficial grinding scratches from the polisher. Say and colleagues also reported resin removal along with some filler debonding with the Venus Supra on a nano‐hybrid composite.…”

“…Many studies have shown that the smoothest surface is obtained when the resin composite is polymerized against a Mylar strip . Even though the highest quality of smoothness is obtained, due to the low mechanical properties of this outer layer and the need for contouring and adjusting the occlusion, further F/P procedures are always necessary.…”

“…In this study, F/P procedures were accomplished using a slow‐speed handpiece adapted to a standardized paralleling device which has designed to keep the applied pressure constant and perpendicular to the surface of the specimens. In most of the previous studies, the pressure applied to F/P instruments were standardized by the hand pressure of the operator which is not a reliable method . There are also some studies which have used highly standardized methods with controllable and measurable applied force .…”

Evaluation of surface roughness of different direct resin-based composites

“…[1516] Hardness of material is defined as its resistance to permanent surface indentation or penetration, and this property is related to material strength, ductility, elastic stiffness, plasticity, strain, toughness, viscoelasticity, and viscosity. [1718]…”

Effect of tooth brushing on gloss retention and surface roughness of five bulk‐fill resin composites

“…In addition to displaying good physical properties, RBC restorations should be esthetically pleasing and smooth to reduce the accumulation of plaque. Consequently, the surface roughness after simulated masticatory and toothbrush wear is an important feature to consider when determining which RBC is best to use in a restoration . In a systematic review to determine if nanofill or submicron RBCs were smoother and retained their surface gloss after toothbrushing compared with micro‐hybrid RBCs, it was reported that there was no good evidence to support the use of nanofill or submicron RBCs compared with microhybrid filled RBCs .…”