Effect of different finishing and polishing systems on surface properties of universal single shade resin-based composites

Abstract

Background Recently, universal single-shade resin composites have become increasingly available in the dental market. The modification of their composition can have an inadvertent effect on their physical and surface properties, and subsequently determinantal effect on their clinical function and longevity. Therefore, this study aimed to evaluate the effect of different finishing and polishing (F/P) systems on surface roughness (Ra), surface gloss (GU), and Vickers microhardness (VMH) of universal single-shade RBCs. Materials and methods Four commercial RBCs were used; the universal single-shade RBCs were Omnichroma, Charisma® Diamond ONE, and Vittra APS Unique, and a conventional nanocomposite Filtek™ Z250 XT was used as a control. The 3 F/P systems were Sof-Lex™ XT, Enhance®/PoGo®, and Diacomp® Plus Twist. A total of 160 discs were used for the 3 F/P system groups for all RBCs (n = 10). After F/P, the Ra, GU, and VMH were assessed. The data were analyzed using 2-way ANOVA at p-value < 0.05. Results Significant differences were found among the four RBCs and the 3 F/P systems (p < .000). Omnichroma showed the lowest Ra and acceptable GU, but the lowest VMH. Charisma showed the highest Ra, acceptable GU, and VMH. Vittra showed acceptable Ra, GU, and VMH and Filtek showed the highest GU, VMH, and acceptable Ra. Conclusion Although conventional nanohybrid RBC (Filtek Z250 XT) showed better GU and VMH values, the universal single-shade RBCs demonstrated comparable surface properties. The highest GU & VMH and lowest Ra were achieved by Diacomp followed by Enhance and Soflex.

Flexural strength and degree of conversion of universal single shade resin-based composites

“…Four RBCs available in the market were the main materials chosen for this study ( Table 1 ) [ 29 ]. The universal single shade RBCs were OC (Tokuyama Dental, Tokyo, Japan) [ 18 ], CD (Kulzer GmbH, Hanau, Germany) [ 19 ], and VU (FGM, Joinville, SC, Brazil) [ 20 ] and the conventional resin composite Filtek ™ Z250 XT (FT) (3 M ESPE, St. Paul, MN, US) [ 30 ] was used as a control.…”

“…Base resin: BIS-GMA, UDMA, BIS-EMA, TEGDMA and PEGDMA Nanohybrid (82 wt % 68 vol%) (NE58072) 3 M Dental Products ESPE, St. Paul, Minnesota, United States Abbreviations: Bis-GMA = Bisphenol A diglycidyl dimethacrylate; UDMA=Urethane dimethacrylate; TEGDMA = Triethylene glycol dimethacrylate; Bis-EMA = Bisphenol A ethoxylated dimethacrylate; PEGDMA=Polyethylene glycol dimethacrylate; HEMA, = 2-hydroxyethyl methacrylate. TCD, tricyclodecane; BHT, butylhydroxytoluene [ 29 ]. …”