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Chinese Journal of Dental Research
Chin J Dent Res 23 (2020), No. 1     25. Mar. 2020
Chin J Dent Res 23 (2020), No. 1  (25.03.2020)

Page 63-69, doi:10.3290/j.cjdr.a44337, PubMed:32232231

Effects of Different Polishing Protocols and Curing Time on Surface Properties of a Bulk-fill Composite Resin
Lassila, Lippo / Dupont, Airald / Lahtinen, Karri / Vallittu, Pekka K. / Garoushi, Sufyan
Objective: To determine the effects of different polishing protocols and curing times on the surface roughness (SR), surface gloss (SG) and surface hardness (SH) of a bulk-fill composite resin (BCR).
Methods: A total of 30 block-shaped specimens (40 mm long × 10 mm wide × 2 mm thick) were made from Filtek Bulk-Fill composite resin and divided into two groups (n = 15) according to curing time (10 and 40 seconds). Each group was subdivided into five groups (n = 3) according to the polishing protocol: laboratory polishing with different silicon paper grits (G1:1200) → (G2:2400) → (G3:4000). Chairside polishing was performed using a series of Sof-Lex spiral (G4) and Jiffy Polisher (G5) points. The SR was measured by a surface profilometer. A Vickers indenter was used to test the SH, and a glossmeter was used to determine the SG at 60 degrees. The SR, SG and SH were quantified before and after polishing. A scanning electron microscopy (SEM) evaluation was then performed.
Results: The curing time did not affect the surface properties of the BCR (P > 0.05). Significant differences in SR (ranging from 0.1 to 2 μm) and SG (ranging from 20 to 90 GU [gloss unit]) were found according to the type of polishing protocol (P < 0.05). The SH values following different polishing protocols were significantly higher (ranging from 82 to 95 VH [Vickers hardness]) than the polishing values obtained before the polishing protocols (P < 0.05).
Conclusion: The tested chairside polishing protocols presented lower SG and higher SR values than the laboratory polishing protocols.

Keywords: bulk-fill composite resin, curing time, polishing protocol, surface properties