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J Dent Res 85(8):728-732, 2006
© 2006 International and American Associations for Dental Research

RESEARCH REPORT
Biomaterials & Bioengineering

Contraction Stress in Dentin Adhesives Bonded to Dentin

M. Hashimoto1,*, A.J. de Gee2, M. Kaga1, and A.J. Feilzer2

1 Division of Pediatric Dentistry, Hokkaido University, Graduate School of Dental Medicine, Kita 13, Nishi 7, Kitaku, Sapporo 060–8586, Hokkaido, Japan; and
2 Department of Dental Materials Science, Academic Center for Dentistry Amsterdam (ACTA), The Netherlands

* corresponding author, masanori-h{at}mue.biglobe.ne.jp

Adhesives cured under constrained conditions develop contraction stresses. We hypothesized that, with dentin as a bonding substrate, the stress would reach a maximum, followed by a continuous decline. Stress development was determined with a tensilometer for two total-etch systems and two systems with self-etching primers. The adhesives were placed in a thin layer between a glass plate and a flat dentin surface pretreated with phosphoric acid or self-etching primer. After an initial maximum shortly after light-curing, the stress decreased dramatically for the total-etch systems (70%) and, to a lesser extent, for the adhesives with self-etching primers (30%). The greater stress decrease for the total-etch systems was ascribed to water and/or solvents released into the adhesives from the fully opened dentinal tubules by the pulling/sucking action of the contraction stress. This happened less with the adhesives with self-etching primers, where the tubules remained mainly closed.

KEY WORDS: polymerization • contraction stress • dentin adhesive • resin composite






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