Publicação
Optimal nano-silica filler concentration to optimize kinetics, rheology and bonding of self-adhesive composites
| datacite.subject.fos | Ciências Médicas::Ciências da Saúde | |
| datacite.subject.sdg | 03:Saúde de Qualidade | |
| dc.contributor.author | Alves, Miguel | |
| dc.contributor.author | Pereira, Pedro | |
| dc.contributor.author | Silva, Diana C. | |
| dc.contributor.author | Delgado, António H. S. | |
| dc.date.accessioned | 2026-06-15T15:43:41Z | |
| dc.date.available | 2026-06-15T15:43:41Z | |
| dc.date.issued | 2026-04 | |
| dc.description.abstract | To determine how silica nanoparticle (NanoSi) content modulates polymerization kinetics, dentin bonding, and interfacial adaptation in self-adhesive flowable resin composites (SAFRCs). Five UDMA/PPGDMA/10-MDP SAFRCs containing 0, 2.5, 5, 7.5, or 10 wt% NanoSi were compared to a commercial reference (Vertise Flow, VF). Real-time ATR-FTIR provided t0.5, Rpmax, delay time, and DCmax; viscosity was measured under controlled shear. Shear bond strength (SBS) was tested at 24 h. Masson’s trichrome and environmental SEM (E-SEM) assessed interfaces. Two-way MANOVA examined formulation and exposure time (20 vs 40 s) effects on kinetics; one-way ANOVA analyzed µSBS (ɑ = 0.05). Formulation and time significantly affected the multivariate kinetic response (Wilks’ λ_formulation = 0.1905, p = 0.0099; Wilks’ λ_time = 0.4296, p = 0.0045), with no interaction. NanoSi_2.5 polymerized fastest (Rpmax 3.17 ± 0.43%·s⁻1); NanoSi_5 was slowest (1.61 ± 0.26%·s⁻1). DCmax increased with filler, peaking at NanoSi_10 (78.77 ± 2.64%); extending exposure from 20 to 40 s raised DCmax by 10.23 ± 2.16% without altering kinetics. All pastes were shear-thinning, with viscosity rising monotonically with NanoSi. SBS differed among materials (ANOVA F = 3.14, p = 0.02): VF was highest (8.6 ± 2.2 MPa); NanoSi_0 reached 6.0 ± 1.1 MPa (NS vs VF); NanoSi_2.5–5 clustered lower (~ 3–4 MPa) and NanoSi_7.5 reached the minimum. Trichrome and E-SEM showed thin, continuous interfaces at 0–2.5 wt% and increasing porosity/thin separations at 7.5–10 wt%. Nanosilica altered cure, flow and interfacial quality trade-offs; faster early kinetics and higher final conversion did not translate into higher SBS, emphasizing the need to optimize interfacial wetting/adaptation alongside mechanical parameters in SAFRC design. A formulation window may exist in which flow, cure, and bonding are balanced to enhance the clinical potential of self-adhesive composites. | eng |
| dc.identifier.citation | Alves, M., Pereira, P., Silva, D.C. et al. Optimal nano-silica filler concentration to optimize kinetics, rheology and bonding of self-adhesive composites. Sci Rep 16, 12638 (2026). https://doi.org/10.1038/s41598-026-43290-5 | |
| dc.identifier.doi | 10.1038/s41598-026-43290-5 | |
| dc.identifier.issn | 2045-2322 | |
| dc.identifier.uri | http://hdl.handle.net/10400.26/63599 | |
| dc.language.iso | eng | |
| dc.peerreviewed | yes | |
| dc.publisher | Springer Nature | |
| dc.relation.hasversion | https://doi.org/10.1038/s41598-026-43290-5 | |
| dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | |
| dc.subject | Self-adhesive flowable composite | |
| dc.subject | Nanoparticles | |
| dc.subject | Polymerization kinetics | |
| dc.subject | Dentin bond strength | |
| dc.subject | Resin–dentin interface | |
| dc.subject | Rheology | |
| dc.title | Optimal nano-silica filler concentration to optimize kinetics, rheology and bonding of self-adhesive composites | eng |
| dc.type | contribution to journal | |
| dspace.entity.type | Publication | |
| oaire.citation.startPage | 12638 | |
| oaire.citation.title | Scientific Reports | |
| oaire.citation.volume | 16 | |
| oaire.version | http://purl.org/coar/version/c_970fb48d4fbd8a85 |