Analysis of chemical interaction of 4-MET with hydroxyapatite using XPS

Kouji Nagakane, Yasuhiro Yoshida, Isao Hirata, Ryuichi Fukuda, Youichi Nakayama, Kenichi Shirai, Tatsuyuki Ogawa, Kazuomi Suzuki, Bart Van Meerbeek, Masayuki Okazaki

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)

Abstract

Each dental adhesive contains a specific functional monomer that determines its actual adhesive performance to tooth tissue. 4-methacryloxyethyl trimellitic acid (4-MET) is well-known as one of the functional monomers mostly available and consequently widely used in commercial adhesives. We therefore characterized the chemical interaction of 4-MET with hydroxyapatite (HAp) using X-ray Photoelectron Spectroscopy (XPS). XPS revealed that the peak representing -COO- of 4-MET shifted to a lower binding energy, when 4-MET was adsorbed onto HAp. Deconvolution of this shifted peak disclosed two components with a peak representing unreacted carboxyl groups and ester groups, and a peak suggesting chemical bonding of other carboxyl groups to Ca of HAp. XPS spectra of HAp treated with 4-MET also disclosed the surface to be enriched in calcium and decreased in phosphorus, indicating that phosphorus was extracted at a relatively higher rate than calcium. It can thus be concluded that true chemical bonding of 4-MET with calcium present in HAp occurred, as it was proven using XPS.

Original languageEnglish
Pages (from-to)645-649
Number of pages5
JournalDental materials journal
Volume25
Issue number4
DOIs
Publication statusPublished - Dec 2006

Keywords

  • 4-MET
  • Adhesion
  • XPS

ASJC Scopus subject areas

  • Ceramics and Composites
  • Dentistry(all)

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