Effect of hydroxy groups and microtopography generated by a nanosecond-pulsed laser on pure Ti surfaces

Yuta Kurashina, Atsushi Ezura, Ryo Murakami, Masayoshi Mizutani, Jun Komotori

Research output: Contribution to journalArticle

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Abstract

In this paper, we study a process for modifying the surface microtopography of the Ti oxide layer using a nanosecond-pulsed laser (NPL). Even now, the mechanism by which hydroxyl groups are generated on the titanium surface treated by NPL is not clear. Hence, we evaluated the surface properties of the NPL defocus distances on pure titanium surfaces, and investigated the relationship between the generation of hydroxyapatites/cell viability and the titanium surface characteristics. The NPL defocus distance was varied from 0 to 4 mm. Defocus distances of 0 and 2 mm generated microtopographical features on the titanium surface, and the resulting surfaces exhibited a greater density of OH groups than the surface treated with a defocus distance of 4 mm. The surfaces treated using defocus distances of 0 and 2 mm were found to be coated with microspherical hydroxyapatite composed of coexisting plate- and needle-like crystals after immersion in simulated body fluid, and alkaline phosphatase activity assays indicated improved cell compatibility. The improvements in biocompatibility and cell compatibility were due to the pocket-like microtopographical structures formed along the processing trace. These pockets contained a large amount of OH groups, and promoted the growth of hydroxyapatite. [Figure not available: see fulltext.].

Original languageEnglish
Article number57
JournalJournal of Materials Science: Materials in Medicine
Volume30
Issue number5
DOIs
Publication statusPublished - 2019 May 1

Fingerprint

Titanium
Pulsed lasers
Lasers
Durapatite
Hydroxyapatites
Hydroxyapatite
Surface Properties
Body Fluids
Immersion
Hydroxyl Radical
Oxides
Needles
Alkaline Phosphatase
Cell Survival
Body fluids
Phosphatases
Growth
Biocompatibility
Surface properties
Assays

ASJC Scopus subject areas

  • Biophysics
  • Bioengineering
  • Biomaterials
  • Biomedical Engineering

Cite this

Effect of hydroxy groups and microtopography generated by a nanosecond-pulsed laser on pure Ti surfaces. / Kurashina, Yuta; Ezura, Atsushi; Murakami, Ryo; Mizutani, Masayoshi; Komotori, Jun.

In: Journal of Materials Science: Materials in Medicine, Vol. 30, No. 5, 57, 01.05.2019.

Research output: Contribution to journalArticle

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