TEM characterization of a silorane composite bonded to enamel/dentin

Atsushi Mine, Jan De Munck, Annelies Van Ende, Marcio Vivan Cardoso, Takuo Kuboki, Yasuhiro Yoshida, Bart Van Meerbeek

Research output: Contribution to journalArticlepeer-review

71 Citations (Scopus)


Objectives: The low-shrinking composite composed of combined siloxane-oxirane technology (Filtek Silorane, 3M ESPE, Seefeld, Germany) required the development of a specific adhesive (Silorane System Adhesive, 3M ESPE), in particular because of the high hydrophobicity of the silorane composite. The purpose of this study was to characterize the interfacial ultra-structure at enamel and dentin using transmission electron microscopy (TEM). Methods: Non-demineralized/demineralized 70-90 nm sections were prepared following common TEM specimen processing procedures. Results: TEM revealed a typical twofold build-up of the adhesive resin, resulting in a total adhesive layer thickness of 10-20 μm. At bur-cut enamel, a tight interface without distinct dissolution of hydroxyapatite was observed. At bur-cut dentin, a relatively thin hybrid layer of maximum a few hundreds of nanometer was formed without clear surface demineralization. No clear resin tags were formed. At fractured dentin, the interaction appeared very superficial (100-200 nm). Distinct resin tags were formed due to the absence of smear plugs. Silver-nitrate infiltration showed a varying pattern of both spot- and cluster-like appearance of nano-leakage. Traces of Ag were typically detected along some part of the enamel-adhesive interface and/or between the two adhesive resin layers. Substantially more Ag-infiltration was observed along the dentin-adhesive interface of bur-cut dentin, as compared to that of fractured dentin. Conclusions: The nano-interaction of Silorane System Adhesive should be attributed to its relatively high pH of 2.7. The obtained tight interface at both enamel and dentin indicates that the two-step self-etch adhesive effectively bridged the hydrophilic tooth substrate with the hydrophobic silorane composite.

Original languageEnglish
Pages (from-to)524-532
Number of pages9
JournalDental Materials
Issue number6
Publication statusPublished - Jun 2010


  • Adhesion
  • Low-shrinking composite
  • Nano-interaction
  • Self-etch adhesive
  • Silorane

ASJC Scopus subject areas

  • Materials Science(all)
  • Dentistry(all)
  • Mechanics of Materials


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