Impact of light-cure protocols on the porosity and shrinkage of commercial bulk fill dental resin composites with different flowability

Buelvas, Daina Dayana Arenas; Besegato, João Felipe; Vicentin, Bruno Luiz Santana; Jussiani, Eduardo Inocente; Hoeppner, Márcio Grama; Andrello, Avacir Casanova; Mauro, Eduardo Di

doi:10.1007/s10965-020-02257-4

Cited by 9 publications

(9 citation statements)

References 36 publications

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“…Although porosity strongly depends on the consistency and handling conditions, it is a multifactorial phenomenon and is also influenced by the polymerization of the material. The curing protocol and the resin matrix composition have an impact on the polymer network architecture, and its heterogeneity may lead to increased porosity [40]. In contrast to studies reporting the improved monomer conversion of pre-heated RBCs under isothermal conditions, in a clinical setting, the RBC shows rapid cooling after removal from the warming device [41,42].…”

Section: Discussionmentioning

confidence: 99%

“…Moreover, the rapid cooling of the pre-heated RBC before polymerization may contribute to the structural heterogeneity of the polymer network [44]. A rapid decrease in temperature may lead to early vitrification, which restricts molecular mobility and hinders the diffusion of air bubbles which will become trapped in the material [40], resulting in higher porosity detected by micro-CT.…”

Section: Discussionmentioning

confidence: 99%

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Effect of Pre-Heating on the Monomer Elution and Porosity of Conventional and Bulk-Fill Resin-Based Dental Composites

Dunavári

Berta

Kiss

et al. 2022

IJMS

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The pre-heating of dental resin-based composites (RBCs) improves adaptability to cavity walls, reducing microleakages. However, the rapid cooling of the pre-heated RBC may change the polymerization kinetics, and thus the final network configuration of the RBC. It is well known that unreacted monomers remaining in the set RBC can leach into the oral cavity. However, it is still not clear how the pre-heating and cooling of RBCs alter monomer elution (ME). Thus, the purpose was to determine the ME from room-temperature and pre-heated RBCs, in addition to determining the closed porosity (CP) volume. Bulk-filled RBCs and layered conventional RBC samples were prepared. The pre-polymerization temperature was set at 24 °C and 55/65 °C. The ME from RBC samples was assessed with high-performance liquid chromatography using standard monomers. CP was measured with micro-computed tomography. ME decreased significantly from bulk fills and increased from layered samples as a result of pre-heating. Pre-heating was unfavorable in terms of CP in most RBCs. Based on the effect size analysis, ME and CP were greatly influenced by both material composition, pre-polymerization temperature, and their interaction. While the pre-heating of high-viscosity bulk-fill RBCs is advantageous from a clinical aspect regarding biocompatibility, it increases CP, which is undesirable from a mechanical point of view.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Effect of Pre-Heating on the Monomer Elution and Porosity of Conventional and Bulk-Fill Resin-Based Dental Composites

Dunavári

Berta

Kiss

et al. 2022

IJMS

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“…The amount of energy required for dissociation of hydrogen bonds is proportional to the monomer viscosity, as indicated for Bis-GMA (1200 Pa) and TEGDMA (0.0011 Pa). 42,43 The presence of hydrogen proton donors within the polymer structure contributes to greater crosslinking and therefore limits water sorption as seen for Bis-GMA (32.18 mg mm À3 ) and TEGDMA (66.93 mg mm À3 ). As a result, the leaching of resin monomers and swelling can be accelerated in the presence of compounds with hydroxyl and urethane groups where both proton donors and proton acceptors are present to facilitate water sorption.…”

Section: Polymer and Filler Leachabilitymentioning

confidence: 99%

Unveiling the mechanisms behind surface degradation of dental resin composites in simulated oral environments

et al. 2023

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“…New technologies have been introduced such as the advanced polymerization system (APS), which is used in adhesives and composite resins (24,25,26). This technology involves the combination of different photoinitiators through partial replacement of camphorquinone (24)(25)(26). The incorporation of this system provides different benefits to the materials.…”

Section: Introductionmentioning

confidence: 99%

“…For the conventional type composite, the reduction of camphorquinone allows longer working time under ambient light and predictability of the final color of the material (24). For bulk-fill composites, the main advantage is a greater polymerization capacity, that is, an increase in the degree of conversion and curing depth, enabling its use in large increments (24,26). Considering the adverse biological effects of some monomers (15,27), the manufacturers of APS composites highlight the absence of Bisphenol-A Glycidyl Methacrylate (Bis-GMA), a highly viscous high molecular weight monomer, in these composites.…”

Section: Introductionmentioning

confidence: 99%

Effect of thickness on shrinkage stress and bottom‐to‐top hardness ratio of conventional and bulk‐fill composites

Santin

Velo

Camim

et al. 2021

European J Oral Sciences

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This study evaluated the effect of the material thickness on shrinkage stress and bottom-to-top hardness ratio of conventional and bulk-fill composites. Six commercial composites were selected based on their different technologies: Two conventional (C1, C2), two high-viscosity bulk-fill (HVB1, HVB2), and two low-viscosity bulkfill (LVB1, LVB2). Shrinkage stress was analyzed for five specimens with 2 mm thickness (C-factor 0.75 and volume 24 mm 3 ) and five specimens with 4 mm thickness (C-factor 0.375 and volume 48 mm 3 ) for 300 s in a universal testing machine.Bottom-to-top hardness ratio values were obtained from Knoop microhardness measurements in specimens with 2-and 4-mm thickness (n = 5). Thickness increase resulted in significantly higher shrinkage stress for all materials with the exception of HVB2 and LVB1. C1, C2, HVB2, and LVB1 showed lower bottom-to-top hardness ratios at 4 mm than at 2 mm. Only LVB2 presented a bottom-to-top hardness ratio lower than 80% at 2 mm, while HVB1 surpassed this threshold at 4 mm of depth.The results suggest that the increase of composite thickness affected the shrinkage stress values. Also, thickness increase resulted in lower bottom-to-top hardness ratio. HVB1 showed better behavior than other bulk-fill materials, with low stress and adequate bottom-to-top hardness ratio at 4 mm thickness.

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Impact of light-cure protocols on the porosity and shrinkage of commercial bulk fill dental resin composites with different flowability

Cited by 9 publications

References 36 publications

Effect of Pre-Heating on the Monomer Elution and Porosity of Conventional and Bulk-Fill Resin-Based Dental Composites

Effect of Pre-Heating on the Monomer Elution and Porosity of Conventional and Bulk-Fill Resin-Based Dental Composites

Unveiling the mechanisms behind surface degradation of dental resin composites in simulated oral environments

Effect of thickness on shrinkage stress and bottom‐to‐top hardness ratio of conventional and bulk‐fill composites

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