Abstract
The aim of this study was to evaluate the influence of the polishing period on surface roughness (Ra) before and after thermal aging in four composite resins - CR (Durafill VS, Vittra APS, Filtek Z350XT and Spectra Smart). This in vitro study evaluated: (1) CR in 4 levels; (2) polishing period (PP) in three levels (immediate, 7 and 14 days) and (3) artificial aging in two levels: without aging and after 10,000 cycles. For this, 240 CR specimens were allocated into 12 groups (n=20) according to PP with SofLex Pop On disks. For Ra, 3 measurements on the top surface of each specimen were performed with a diamond tip and constant load of 4mN and 0.25mm/s. Next, the specimens were aged in thermocycling, with temperatures of 5° and 55°C, during 30 seconds in each temperature, and repeated testing afterwards. The data were submitted to statistical tests with 5% significance. The alteration in Ra was observed only in the late polishing in the period of 7 days, where the Durafill VS CR showed higher Ra in comparison to the other CRs. After thermocycling, the groups showed significant difference only with late polishing in the 21-day period; the nanoparticulated RCs (Z350XT˂Vittra APS) recorded the highest Ra values, followed by the microhybrid (DurafillVS) and nanohybrid (Spectra Smart) RCs, respectively. Thus, late polishing in the 7-day and immediate period provided higher Ra values, especially for the nanohybrid and microhybrid composite resins.
Highlights
Because the ability to mimic the characteristics of dental tissues, composite resins have made it possible to make truly imperceptible restorations (Alonso, Darriba, & Caserío, 2017; Pallesen & van Dijken, 2015)
Between the polishing periods for each resin, there was a significant difference for Durafill VS and Spectra Smart resins, where the highest values of surface roughness were recorded in the 7 days (GV) and immediate (G II) polishing periods, respectively (p
Similarities for resins Z 350 XT and Vittra APS were recorded for all polishing periods (p
Summary
Because the ability to mimic the characteristics of dental tissues, composite resins have made it possible to make truly imperceptible restorations (Alonso, Darriba, & Caserío, 2017; Pallesen & van Dijken, 2015). The unique combination of aesthetics, accessibility and greater preservation of healthy dental structure, in recent years, has reported good clinical performance when associated with the applicability of composite resin (Duarte & Saad, 2008; Opdam et al, 2014). They have become one of the most used restorative materials for aesthetic-functional oral-rehabilitation (Alonso et al, 2017). Some reports in the literature correlate early restoration failures and marginal defects from the finishing and polishing process
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