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Essential Minerals for Bone Health01:31

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Related Experiment Video

Updated: May 9, 2026

Rapid Mix Preparation of Bioinspired Nanoscale Hydroxyapatite for Biomedical Applications
05:41

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Published on: February 23, 2017

Bioactive surface modification of hydroxyapatite.

Yasuhiko Abe1, Yohei Okazaki, Kyou Hiasa

  • 1Department of Advanced Prosthodontics, Applied Life Sciences, Institute of Biomedical & Health Sciences, Hiroshima University, Minami-ku, Hiroshima, Japan. abey@hiroshima-u.ac.jp

Biomed Research International
|July 18, 2013
PubMed
Summary

This study optimized phosphoric acid etching to modify hydroxyapatite (HAP) surfaces, enhancing osteoblast-like cell adhesion, proliferation, and differentiation for improved bone regeneration.

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Area of Science:

  • Biomaterials Science
  • Surface Chemistry
  • Cell Biology

Background:

  • Hydroxyapatite (HAP) is a key biomaterial for bone regeneration.
  • Modifying HAP surface properties, like the Ca/P ratio, can influence cellular responses.
  • Optimizing surface characteristics is crucial for enhancing osseointegration and bone healing.

Purpose of the Study:

  • To develop an acid-etching protocol to alter the Ca/P ratio of nanostructured HAP surfaces.
  • To evaluate the effects of modified HAP surfaces on osteoblast-like cell behavior in vitro.
  • To establish a surface modification procedure for improved HAP-based bone regenerative materials.

Main Methods:

  • Hydroxyapatite (HAP) surfaces were treated with varying concentrations of phosphoric acid (10-60%).
  • Surface characterization involved X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), scanning electron microscopy (SEM), surface roughness, and wettability analysis.
  • In vitro cell studies assessed initial adhesion, proliferation, and differentiation of MC3T3-E1 cells on modified HAP surfaces.

Main Results:

  • A 30% phosphoric acid etching process was identified to effectively alter the Ca/P ratio to 1.50 without damaging the HAP grain structure.
  • Accidental dry storage of etched HAP resulted in a Ca/P ratio approximation to 1.00.
  • Significant promotion (P < 0.05 and 0.01) of MC3T3-E1 cell initial adhesion, proliferation, and differentiation was observed on modified HAP surfaces.

Conclusions:

  • The 30% phosphoric acid etching method effectively modifies the Ca/P ratio of nanostructured HAP.
  • The altered HAP surface chemistry promotes osteoblast-like cell adhesion, proliferation, and differentiation.
  • This surface modification technique holds potential for accelerating bone regeneration applications.