Vinicius Rosa

@article{ISI:001391110500001,
title = {Graphene nanocoating on titanium maintains structural and antibiofilm properties post-sterilization},
author = {Julien Luc Paul Morin and Nileshkumar Dubey and Emma Kim Luong-Van and Baiqing Yu and Clarice Ferreira Sabino and Nick Silikas and Shruti Vidhawan Agarwalla and Castro A H Neto and Vinicius Rosa},
doi = {10.1016/j.dental.2024.10.009},
times_cited = {0},
issn = {0109-5641},
year = {2024},
date = {2024-12-17},
journal = {DENTAL MATERIALS},
volume = {41},
number = {1},
pages = {7-15},
publisher = {ELSEVIER SCI LTD},
address = {125 London Wall, London, ENGLAND},
abstract = {Objective: To evaluate the impact of sterilization methods on the structural integrity and antimicrobial properties of graphene nanocoating on titanium (GN). Methods: GN was transferred to titanium using wet (WT) or dry transfer (DT) techniques and sterilized using an autoclave (AC), glutaraldehyde (GA), or ethylene oxide (EtO). The GN structure was characterized using Raman spectroscopy before and after sterilization. Additional specimens were characterized by Raman after AC and water jetting. Biofilm formation was assessed before and after AC using colony-forming units (CFU), biofilm biomass, and SEM (uncoated titanium was the control). Three independent samples were used for structural characterization and biofilm quantification. Statistical analyses were conducted using one-way analysis of variance (ANOVA) and Tukey's test (alpha = 0.05). Results: WT and DT demonstrated high structural stability after sterilization and water jetting, with negligible coating quality or coverage loss. GN exhibited lower biofilm formation even after AC sterilization, as shown by the reduction in CFU counts, biofilm biomass, and SEM images compared to the control. Significance: GN demonstrated high resistance to the stresses imposed by all sterilization methods tested, maintaining its structural integrity, resistance to water-jet cleaning, and antibiofilm potential. The findings suggest that standard industrial practices can effectively sterilize highly resilient GN on titanium implants and possibly other biomaterials.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{ISI:001305258800001,
title = {Physico-Mechanical Properties and Bonding Performance of Graphene-Added Orthodontic Adhesives},
author = {Shiyao Liu and Ahmed El-Angbawi and Vinicius Rosa and Nick Silikas},
doi = {10.3390/jfb15080204},
times_cited = {0},
year = {2024},
date = {2024-08-01},
journal = {JOURNAL OF FUNCTIONAL BIOMATERIALS},
volume = {15},
number = {8},
publisher = {MDPI},
address = {ST ALBAN-ANLAGE 66, CH-4052 BASEL, SWITZERLAND},
abstract = {This study aimed to assess the key physico-mechanical properties and bonding performance of orthodontic adhesives with graphene addition for bonding a fixed retainer. Transbond LR (3M) and Transbond LV (3M) with no graphene were set as the control groups. Graphene was added into LR and LV at concentrations of 0.01 wt%, 0.05 wt% and 0.1 wt%. The stickiness of the uncured samples (n = 5) and real-time degree of conversion (DC) of the samples (n = 3) were measured over a 24-h period using Fourier-transform infrared spectroscopy. The hardness and other mechanical parameters, including the Martens hardness (HM), indentation modulus (EIT), elastic index (eta IT) and creep (CIT), were measured (n = 5). To measure the shear bond strength (SBS), adhesive composites were applied using a mold to bond the retainer wire to the lingual surfaces of bovine incisors (n = 10). Fracture modes subsequent to the SBS test were examined under light microscopy. Statistical analysis was conducted using ANOVA and Tukey tests (alpha = 0.05). In the LR groups, the LR + 0.01 showed the highest SBS (12.6 +/- 2.0 MPa) and HM (539.4 +/- 17.9 N/mm2), while the LV + 0.05 (7.7 +/- 1.1 MPa) had the highest SBS and the LV + 0.1 had the highest HM (312.4 +/- 17.8 N/mm2) among the LV groups. The most frequent failure mode observed was adhesive fracture followed by mixed fracture. No statistical difference was found between the graphene-added groups and the control groups in terms of the EIT, eta IT and CIT, except that the CIT was significantly lower in the LR + 0.01 than in the control group. Graphene addition had no significant adverse effect on the stickiness and DC of both LR and LV.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}