Hidehiko Yashiro

Optical properties of β-tricalcium phosphate and hydroxyapatite for droplet-free hydroxyapatite coating by pulsed-laser deposition

Hidehiko Yashiro, Hiroshi Takashima, Hideki Ohmura, Masayuki Kakehata et autres

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Bonding efficacy of highly translucent zirconia and lithium disilicate glass ceramics after femtosecond laser irradiation

Kaiqi Xu, Masanao Inokoshi, Kumiko Yoshihara, Masayuki Kakehata et autres

PURPOSE: ) glass ceramics. METHODS: specimens). The surface roughness (arithmetic average [Sa] and developed interfacial area ratio [Sdr]) and shear bond strength after 24 h and 10,000 thermal cycles were measured and statistically analyzed. RESULTS: glass-ceramic specimens exhibited high shear bond strength …

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Annealing-temperature dependence of adhesion strength of hydroxyapatite layers coated on zirconia substrates by droplet elimination pulsed-laser deposition scheme

Hidehiko Yashiro, Masayuki Kakehata

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Femtosecond Laser Irradiation to Zirconia Prior to Calcium Phosphate Coating Enhances Osteointegration of Zirconia in Rabbits

Hirotaka Mutsuzaki, Hidehiko Yashiro, Masayuki Kakehata, Ayako Oyane et autres

Calcium phosphate (CaP) coating of zirconia and zirconia-based implants is challenging, due to their chemical instability and susceptibility to thermal and mechanical impacts. A 3 mol% yttrium-stabilized tetragonal zirconia polycrystal was subjected to femtosecond laser (FsL) irradiation to form micro- and submicron …

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A high-quality hydroxyapatite layer coated by droplets eliminated the pulsed-laser deposition scheme

Hidehiko Yashiro, Masayuki Kakehata

Calcium phosphate coatings were employed for medical implants such as dental or orthopedic for bone bonding. Essentially, these layers were dissolved by osteoclast and replaced with newly formed bone by osteoblast. Finally, the implant is fixed with bone without a gap in …

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Zirconia substrate with periodic surface microstructures enhances osteogenic differentiation of rat adipose-derived stem cells

Mayu Yasunaga, Tomoko Watanabe, Gen Yano, Kazutoshi Murotomi et autres

Zirconia substrates with periodic surface microstructures formed by irradiation with a femtosecond laser previously enhanced osteogenic differentiation of rat bone marrow mesenchymal stem cells (BMSCs), associated with a reduction in the cell attachment area. Adipose-derived mesenchymal stem cells (ADSCs) are clinically less …

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Preliminary Study on the Optimization of Femtosecond Laser Treatment on the Surface Morphology of Lithium Disilicate Glass-Ceramics and Highly Translucent Zirconia Ceramics

Masanao Inokoshi, Kumiko Yoshihara, Masayuki Kakehata, Hidehiko Yashiro et autres

All-ceramic restorations have become increasingly popular in dentistry. Toward ensuring that these restorations adhere to the tooth structure, this study determines the optimal femtosecond laser (FL) treatment parameters for lithium disilicate glass-ceramics and highly translucent zirconia ceramics with respect to surface morphology. …

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High crystalline hydroxyapatite coating by eclipse type pulsed-laser deposition for low annealing temperature

Hidehiko Yashiro, Masayuki Kakehata

The eclipse type pulsed-laser deposition (PLD) scheme as a droplet-eliminated method with irradiation on a β-tricalcium phosphate (β-TCP) slab target was employed to achieve high density without holes, high purity, and high crystallinity hydroxyapatite (HAp) coating on a zirconia substrate with a …

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Construction and commissioning of mid-infrared self-amplified spontaneous emission free-electron laser at compact energy recovery linac

Y. Honda, Masahiro Adachi, Shu Eguchi, Masafumi Fukuda et autres

The mid-infrared range is an important spectrum range where materials exhibit a characteristic response corresponding to their molecular structure. A free-electron laser (FEL) is a promising candidate for a high-power light source with wavelength tunability to investigate the nonlinear response of materials. …

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Femtosecond laser-induced periodic surface structure on titanium by irradiation of pulse pairs with phase accuracy delay

Masayuki Kakehata, Hidehiko Yashiro

Construction and Commissioning of Mid-Infrared SASE FEL at cERL

Y. Honda, Masahiro Adachi, Shu Eguchi, Masafumi Fukuda et autres

The mid-infrared range is an important spectrum range where materials exhibit a characteristic response corresponding to their molecular structure. A free-electron laser (FEL) is a promising candidate for a high-power light source with wavelength tunability to investigate the nonlinear response of materials. …

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Crystalline hydroxyapatite coating by hydrolysis using β -tricalcium phosphate target by pulsed-laser deposition

Hidehiko Yashiro, Masayuki Kakehata, Nobuhiro Umebayashi, Atsuo Ito

Abstract Α β -tricalcium phosphate target was employed to decrease the annealing temperature for crystalline hydroxyapatite coating through a hydrolysis process by pulsed-laser deposition. The crystalline hydroxyapatite content of calcium phosphate coating layers was quantitatively evaluated using Raman spectroscopy and X-ray diffraction, …

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