Publishing type：Research paper (scientific journal)  

DOI： 10.3390/jfb15020030

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Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.57468/jjdsf.23-006

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：MDPI AG  

Zirconia has been used as a prosthesis material for over a decade because of its excellent mechanical properties and esthetics. The surface treatment for zirconia generally involves sandblasting and the application of primers for favorable bond strength between the surface and resin. However, sandblasting causes the microcracking and chipping of the zirconia surface. To overcome these challenges, the metallization of the zirconia surface was performed. Ti and Au were sputtered on yttria stabilized zirconia (YSZ) disks and heated to 800 °C for 15 min in air. These disks were bonded to stainless-steel rods using resin cement. Then, shear bond strength tests were performed using an Instron-type testing machine. The shear bond strength of the Ti sputtering group was significantly higher than that of the other groups. According to the results of X-ray photoelectron spectroscopy and electron probe microanalysis, the Ti-sputtered YSZ surface contained both sub-titanium oxide and titanium oxide before heating. Sub-titanium oxide was converted to titanium oxide by heating. These results suggest that metallization using Ti is effective for zirconia surface treatment to improve the shear bond strength between YSZ and resin cement. This metallization technique for YSZ has potential in clinical applications.

DOI： 10.3390/jfb12040062

PubMed

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：MDPI AG  

We investigated the effect of helium atmospheric-pressure plasma (PL) and deep-ultraviolet (UV) light treatments on the adhesive properties of fiber-reinforced poly(ether-ether-ketone) polymer (PEEK). PEEK disks reinforced with carbon (CPEEK) or glass (GPEEK) fibers were polished, modified with PL and UV for 60 s, and the surface energy was calculated by measuring the contact angles. The disk surfaces were analyzed by X-ray photoemission spectroscopy. Shear bond strength testing was performed using a universal testing machine, and the fracture surfaces were observed by electron probe microanalyzer. Data were analyzed with one and two-way ANOVA and Tukey’s post-hoc test (p < 0.05). The surface energies were increased by the modifications, which created OH functional groups on the surfaces. The bond strengths of CPEEK were increased by PL, and those of GPEEK were increased by PL and UV, owing to chemical bonding at the interface.

DOI： 10.3390/jfb11020027

PubMed

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：OMICS Publishing Group  

DOI： 10.4172/2161-1122.1000524

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Event date： 2023.8

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2023.3

Language：Japanese  

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Event date： 2022.12

Language：Japanese  

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Event date： 2022.6

Language：Japanese  

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Event date： 2021.10

Language：Japanese   Presentation type：Poster presentation  

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