Publicação
Pre-cure contact time and dentin surface roughness in modulating bonding and impregnation of self-adhesive composites to dentin
| datacite.subject.fos | Ciências Médicas::Ciências da Saúde | |
| datacite.subject.sdg | 03:Saúde de Qualidade | |
| dc.contributor.author | Miranda, Inês | |
| dc.contributor.author | Sousa, Teresa Andrade e | |
| dc.contributor.author | Pereira, Pedro | |
| dc.contributor.author | Delgado, António H. S. | |
| dc.date.accessioned | 2026-06-16T15:18:42Z | |
| dc.date.available | 2026-06-16T15:18:42Z | |
| dc.date.issued | 2026-05 | |
| dc.description.abstract | Background: Self-adhesive flowable resin composites (SAFRCs) offer simplified, single-step placement and are intended to reduce technique sensitivity, but their bonding remains largely inconsistent. Therefore, this study investigated whether pre-cure contact time and dentin surface finish affect immediate bond strength and interfacial morphology of two commercial SAFRCs. Materials and methods: Sound human molars were allocated to 12 groups: two SAFRCs (Vertise™ Flow; Constic) × two finishes (fine vs. coarse diamond) × three pre-cure contact times (immediate/0 min, 1 min, 5 min). For positive controls a universal adhesive/conventional composite were applied. Three 2 × 2-mm cylinders/group were bonded to mid-coronal dentin discs and were light-cured (20 s; 950 mW/cm²) and tested in shear bond strength setup (SBS; 24 h at 1 mm/min). One fractured disc/group was examined by SEM and ~ 1-mm interface slices underwent Masson’s trichrome and were imaged at 100× with calibrated scaling. The 12 SAFRC groups were analyzed by three-way ANOVA with Tukey’s (α = 0.05); comparisons with the matched controls were performed separately using one-way ANOVA followed by Dunnett’s test. Results: Material (p = 0.02) and application time (p < 0.0001) significantly affected SBS; surface finish did not (p = 0.97). Five-minute pre-cure contact yielded the highest SBS for both SAFRCs and, in several groups, values not significantly different from the matched controls. SEM showed an application time-dependent improvement of the interface quality: with 0 min application showing no continuous interfacial resin/tubule tags; from 1 to 5 min, progressively continuous resin fronts with tags, most evident at 5 min, irrespective of finish. Masson’s trichrome revealed a more conspicuous dark-pink collagen band at the interface of immediate cure samples and attenuated/discontinuous after 1–5 min. Surface finish mainly altered interfacial contour without qualitative improvement. Conclusion: Prolonged pre-cure contact enhances SAFRC bonding; the tested roughness range was not determinative. Trichrome staining corroborates shallow demineralization with partially exposed collagen, indicating limited monomer infiltration and explaining the material-dependent, low bond efficacy of current SAFRCs. | eng |
| dc.identifier.citation | Miranda, I., Andrade e Sousa, T., Pereira, P. et al. Pre-cure contact time and dentin surface roughness in modulating bonding and impregnation of self-adhesive composites to dentin. BMC Oral Health 26, 847 (2026). https://doi.org/10.1186/s12903-026-08225-6 | |
| dc.identifier.doi | 10.1186/s12903-026-08225-6 | |
| dc.identifier.issn | 1472-6831 | |
| dc.identifier.uri | http://hdl.handle.net/10400.26/63613 | |
| dc.language.iso | eng | |
| dc.peerreviewed | yes | |
| dc.publisher | Springer Nature | |
| dc.relation.hasversion | https://doi.org/10.1186/s12903-026-08225-6 | |
| dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | |
| dc.subject | FE-SEM | |
| dc.subject | shear bond strength | |
| dc.subject | self-adhesive | |
| dc.subject | self-adhesive composite | |
| dc.title | Pre-cure contact time and dentin surface roughness in modulating bonding and impregnation of self-adhesive composites to dentin | eng |
| dc.type | contribution to journal | |
| dspace.entity.type | Publication | |
| oaire.citation.startPage | 847 | |
| oaire.citation.title | BMC Oral Health | |
| oaire.citation.volume | 26 | |
| oaire.version | http://purl.org/coar/version/c_970fb48d4fbd8a85 |