Depth of cure of bulk-fill light cured composite resins with different initiators

  • Santos A
  • Proença L
  • Polido M
  • et al.
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Abstract

Introduction: Bulk-fill composites’ manufacturers claim that these materials can be completely cured on a single layer up to 5mm [1], reducing the risk of bacterial and salivary contamination or air bubbles incorporation between layers [2]. Therefore, bulk-fill resin composites are also less time-consuming [2]. The aim of this study was to evaluate the depth of cure of bulk-fill composites with different times of curing, according to the photoinitiator and the resin shade. Materials and methods: Specimens were prepared incorporating an increment of composite (Tetric EvoCeram Bulk-Fill [TECBF] IVA and IVB - Ivoclar Vivadent or Filtek One Bulk-Fill [FOBF] A3 and B422 - 3M ESPE) in standardized metal molds with 4mm of diameter and height, using the buccal surface of a superior central incisor as a reflection substrate. Twelve groups (n¼10) were defined according to curing time (10, 20 or 40 seconds), shade (lowest/highest value) and photoini- tiator (lucirin/camphoroquinone). Vickers microhardness (VMH) was measured at the top and bottom of each specimen by 5 indentations with a force of 29,42 N for 5 s. The depth of cure (DC) was obtained by the ratio of the bottom/top VHM [3]. Results above 80% were used to consider the sample well cured [4]. Comparative inferential statistical analysis was performed through IBM SPSS Statistics v.24 software using a three-way ANOVA at a significance level of 5%. Results: Regardless the shade, DC of the composite resins studied showed an improvement tendency with an increased polymerization time. In both of resins, time was the main factor in obtaining a suitable depth of cure (p<0.001 and par- (p<0.001). So, 20 s is the time needed to ensure an adequate polymerization, since there is no statistically significant dif- tial eta squared ¼0.771), being 10 s of polymerization insufficient to reach the minimum of 80% of polymerization ferences between 20 and 40 s of polymerization. Color was not found to be a significant factor in the DC of bulk-fill com- posites (p¼0.916). FOBF showed a similar depth of cure but higher superficial hardness when compared to TECBF. Discussion and conclusions: Curing time is the crucial factor in obtaining a proper depth of cure. Color, on the other hand, does not appear to be a significant factor in the depth of cure of the bulk-fill resin composites studied. The pres- ence of different photoinitiators may justify the differences found between the two resin composites.

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APA

Santos, A., Proença, L., Polido, M., & Cristina Azul, A. (2024). Depth of cure of bulk-fill light cured composite resins with different initiators. Annals of Medicine, 51(sup1), 141–141. https://doi.org/10.1080/07853890.2018.1561985

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