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Effect of Polishing Systems on Surface Roughness of Universal Resin Composites
Rationale:
Polishing of resin composites ensures optimal esthetics and longevity. Effective polishing techniques for conventional multi-shade resin composites are well documented. However, less is known regarding acceptable polishing for newer single-shade universal resin composites.
Objective:
This study compared the surface roughness of five universal resin composites (Omnichroma, Neo Spectra, Charisma Diamond One, One Shade) and one conventional multi-shade resin composite (Palfique Asteria) following the use of three polishing systems (one-step, Enhance PoGo; two-step, EVE Diacomp Plus Twist; three-step, Sof-Lex) and Mylar strip (without polishing).
Methods:
A total of 240 specimens were prepared (n=40 for each resin composite). The specimens were grouped into four subgroups (n=10) based on the polishing system applied. The surface roughness of all specimens was evaluated using a non-contact three-dimensional optical profilometer. One randomly selected specimen from each subgroup underwent scanning electron microscope examination.
Results:
Surface roughness was significantly affected by the resin composite type and the polishing system used (p<0.05). The study groups were ranked by surface roughness, from lowest to highest, across all tested materials as follows: Mylar strip < Enhance PoGo < Sof-Lex < EVE Diacomp. The surface roughness values of the universal resin composites were comparable to the multi-shade nanofilled resin composite in all polishing systems.
