Effect of active hydroxyl groups on the interfacial bond strength of titanium with segmented polyurethane through γ-mercapto propyl trimethoxysilane

Harumi Sakamoto, Yohei Hirohashi, Haruka Saito, Hisashi Doi, Yusuke Tsutsumi, Yoshiaki Suzuki, Kazuhiko Noda, Takao Hanawa

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12 Citations (Scopus)


The objective of this study was to investigate the effect of active hydroxyl groups on a titanium (Ti) surface on the bond strength between Ti and segmented polyurethane (SPU) composite through γ-mercapto propyl trimethoxysilane (γ-MPS). Active hydroxyl groups on Ti surface oxide were controlled by immersion in hydrogen peroxide (H2O2) with different lengths of immersion time, and the resulting concentrations of active hydroxyl groups were evaluated using a zinc-complex substitution technique. For the H2O2-treated Ti, it was characterized using X-ray photoelectron spectroscopy and scanning electron spectroscopy. For the bond strength of Ti/γ-MPS/SPU interface, it was determined using a shear bond test. Results showed that the bond strength increased with increase in the concentration of active hydroxyl groups. In terms of durability after immersion in water at 310 K for 30 days, it was found that bond strength was improved with increase in active hydroxyl groups. Based on the results obtained, active hydroxyl groups on the surface oxide film were clearly one of the causes governing the interfacial bond strength.

Original languageEnglish
Pages (from-to)81-92
Number of pages12
JournalDental Materials Journal
Issue number1
Publication statusPublished - 2008 Jul 9



  • Active hydroxyl group
  • Shear bond strength
  • Silane coupling agent

ASJC Scopus subject areas

  • Ceramics and Composites
  • Dentistry(all)

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