19 research outputs found
Fabrication of bioactive glass coating on pure titanium by sol-dip method: Dental applications
No full text長崎大学学位論文 [学位記番号]博（医歯薬）甲第1388号 [学位授与年月日]令和4年3月18日(2022-03-18)thesi
Fabrication of bioactive glass coating on pure titanium by sol-dip method: Dental applications
No full textA novel multi-structural reinforced treatment on Ti implant utilizing a combination of alkali solution and bioactive glass sol
No full textNagasaki University (長崎大学)博士(歯学)Objective: Alkali treatment and bioactive glass (BG) sol dip-coating are well-known individual methods for titanium (Ti) surface modification. In this study, a unique combination of alkali treatment and bioactive glass sol dip coating was applied to the Ti substrate, then the mechanical properties and cell responses were investigated.
Methods: Based on the methods introduced above, the Ti substrate was treated by 6 mL of an NaOH 5 M aqueous solution for 24 h at 60 ̊C; this was followed by adding 1.2 mL of a BG 58S sol to form a novel combined nanostructure network covered by a thin BG layer. For the assessment of the formed coating layer, the morphology, elemental analysis, phase structure, adhesion property and the cell response of the untreated and treated surfaces were investigated.
Results:The BG coating layer was reinforced by the nanostructure, fabricated through the alkali treatment. The results obtained by applying the combined modification method confirmed that the mechanical and biological properties of the fabricated surface demonstrated the highest performance compared to that of the unmodified and individually modified surfaces.
Significance:The achieved upgrades for this method could be gained from the demanded porous nanostructure and the apatite transformation ability of the alkali treatment. Therefore, the hybridized application of the alkali-BG treatment could be introduced as a promising surface modification strategy for hard-tissue replacement applications.長崎大学学位論文 学位記番号:博(医歯薬)甲第1483号 学位授与年月日:令和5年3月20日Author: Mahdis Nesabi, Alireza Valanezhad, Sirus Safaee, Tetsurou Odatsu, Shigeaki Abe, Ikuya WatanabeCitation: The Journal of the Mechanical Behavior of Biomedical Materials, 124, art. no. 104837; 2021Nagasaki University (長崎大学), 博士(歯学) (2023-03-20)doctoral thesi
Effect of Different Titanium Surface Treatments on the Adhesion Test Result: Dental Application
No full textEffect of a novel bioactive glass synthesized by sol-gel method on restoring primary damage of enamel
No full textThis study investigated the impact of synthesized bioactive glass (BG) (SiO2–CaO–P2O5–MgO–SrO) on the remineralization and surface characteristics of damaged enamel. The primary objective is to evaluate its potential benefits for dental restoration by enhancing enamel strength and structure. The control group consisted of natural enamel samples, while the treatment group received a 20 % suspension of the synthesized bioactive glass for 15 d. The enamel characteristics were analyzed using XRD, ATR-FTIR, SEM, and microhardness testing. Results indicated that demineralized teeth exhibited a 49.60 % reduction in microhardness, while remineralized teeth showed a significant 22.35 % increase compared to demineralized samples. SEM images confirmed bioactive glass deposition and hydroxyapatite formation on the enamel surface. Although XRD did not reveal significant differences in mineralization levels, ATR-FTIR indicated higher mineralization in control and remineralized groups compared to demineralized ones.Next Materials, 8, art. no. 100867; 2025journal articl
Effect of Different Titanium Surface Treatments on the Adhesion Test Result: Dental Application
No full textThe aim of the study was to investigate the effect of different surface treatment of titanium (Ti) on the adhesion test results for dental application. Ti substrates roughened by 400 to 1 500-grit SiC polish papers and alumina blasting, alkali treated by 5 molar (M) NaOH and KOH solutions and heat treated at the temperature range of 400–800 °C were used in this study. The treated samples were subjected to the adhesion test. According to the results of the adhesion test, the adhesive strength showed the highest value for the blasted titanium among all polished and blasted samples. The Ti samples heated at 650 °C showed the highest adhesive strength among all heat-treated samples. Further, the adhesion test results indicated the higher adhesive strength of chemically treated samples treated by NaOH rather than that by KOH. The polished and heated Ti samples showed the highest adhesive strength among all samples.Journal Wuhan University of Technology, Materials Science Edition, 38(1), pp.255-259; 2023journal articl
Enhancing corrosion resistance of AISI 4130 steel through optimized HVOF tungsten carbide coatings
No full textIn the petroleum and petrochemical industries, equipment integrity is jeopardized by aggressive environments promoting corrosion. This study investigates the impact of high-velocity oxygen fuel (HVOF) thermal spray coating parameters on the quality and corrosion resistance of tungsten carbide coatings applied to AISI 4130 steel. Critical parameters such as powder feed rate (60–72 g/min) and spray intensity (6.7–7.2 bar) were optimized for treated samples S3 and S5. Scanning electron microscopy (SEM) images were analyzed to assess coating thickness and quality. Mechanical properties were evaluated using Vickers hardness tests, revealing a substantial increase in hardness from 225 Vickers for the uncoated sample (S0) to 2010 and 2060 Vickers for coated samples S3 and S5, respectively, and in sample S5 compared to S3, the value increased by 2.46% (∗p < 0.05). Corrosion resistance was assessed through Tafel and Nyquist tests, indicating that the HVOF coatings exhibited superior corrosion resistance compared to the control sample. Notably, sample S5 demonstrated lower current density and a more positive corrosion potential than S3, suggesting enhanced protective performance against corrosive ions. The Nyquist plot analysis further confirmed that sample S5 exhibited a higher corrosion resistance due to its uniform distribution of tungsten carbide and reduced porosity. Ultimately, the HVOF coating with a spray intensity of 7.2 bar and a powder feed rate of 72 g/min (sample S5) was identified as the optimal configuration for maximizing corrosion resistance.Results in Surfaces and Interfaces, 18, art. no. 100450; 2025journal articl
New Trends in 3D and 4D Printed Dental and Orthopedic Implants:Methods, Applications and Future Directions
No full textPowder metallurgy for dental biomaterials: Applications, processing, properties and clinical relevance
No full textAdvances in powder metallurgy (PM) have revolutionized the fabrication of dental biomaterials by enabling precise microstructural control and tailored porosity (up to 80 % porosity in scaffolds) while simultaneously reducing waste and processing time. Although conventional PM processes offer a versatile toolkit for dental applications, consolidation techniques achieve near-full densification (exceeding 85 % of theoretical density) and refine microstructures in metallic and ceramic dental restoratives, resulting in enhanced mechanical integrity (compressive strength up to 203 MPa for TiB2/Ti composites) and biocompatibility. Post-processing treatments, ranging from thermal unbinding and sintering schedules to surface modifications, further optimize the mechanical performance (Young's modulus matching bone at 2.2–12.1 GPa), surface finish, and corrosion resistance of the PM-derived dental components. A diverse array of biomaterials, including titanium–indium alloys for endodontic posts and cobalt–chromium partial denture frameworks, has been successfully produced via PM, demonstrating favorable osseointegration and mechanical performance (tensile strength up to 290 MPa for Ta-Zr alloys). Comprehensive performance evaluations, including fatigue testing, wear analysis, and cytocompatibility assays, confirm the clinical viability of PM-fabricated dental biomaterials. Comparative analyses further elucidate the trade-offs between process parameters, part complexity, and cost efficiency, thereby guiding rational selection for specific prosthetic applications. Nonetheless, challenges persist in scaling PM processes for custom dental geometries, managing the residual porosity (5–15 % in sintered parts), and ensuring consistent biocompatibility across diverse alloy systems. This review aims to cover and analyze these issues by mentioning recent advancements, current limitations, and the future landscape of dental PM-derived biomaterial fabrication in a wide framework
