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Effects of Different Polishing Protocols and Curing Time on Surface Properties of a Bulk-fill Composite Resin




TekijätLippo Lassila, Airald Dupont, Karri Lahtinen, Pekka K. Vallittu, Sufyan Garoushi

KustantajaQUINTESSENCE PUBLISHING CO INC

Julkaisuvuosi2020

JournalChinese Journal of Dental Research

Tietokannassa oleva lehden nimiCHINESE JOURNAL OF DENTAL RESEARCH

Lehden akronyymiCHIN J DENT RES

Vuosikerta23

Numero1

Aloitussivu63

Lopetussivu69

Sivujen määrä7

ISSN1462-6446

eISSN1867-5646

DOIhttps://doi.org/10.3290/j.cjdr.a44337


Tiivistelmä
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 x 10 mm wide x 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 mu m) 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.



Last updated on 2024-26-11 at 14:13