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Contraction stress in dentin adhesives bonded to dentin
M Hashimoto1, A J de Gee, M Kaga
1Division of Pediatric Dentistry, Hokkaido University, Graduate School of Dental Medicine, Kita 13, Nishi 7, Kitaku, Sapporo 060-8586, Hokkaido, Japan. masanori-h@mue.biglobe.ne.jp
Journal of Dental Research
|July 25, 2006
Summary
Dental adhesives create stress when curing. Total-etch systems showed a significant stress decrease due to water release from open dentinal tubules, unlike self-etching primer systems.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Adhesive Dentistry
Background:
- Dental adhesives cured under constraint generate contraction stresses.
- Understanding stress development is crucial for adhesive longevity and clinical performance.
Purpose of the Study:
- To investigate the hypothesis that contraction stress in dental adhesives reaches a maximum and then declines when bonded to dentin.
- To compare stress development between total-etch and self-etching primer adhesive systems.
Main Methods:
- Stress development was measured using a tensilometer.
- Two total-etch and two self-etching primer systems were tested.
- Adhesives were applied to dentin pretreated with phosphoric acid or self-etching primer.
Main Results:
- All adhesives exhibited an initial peak in contraction stress post-light curing.
- Total-etch systems showed a dramatic stress decrease (70%), while self-etching primer systems showed a lesser decrease (30%).
- Greater stress reduction in total-etch systems was attributed to water/solvent release from opened dentinal tubules.
Conclusions:
- Contraction stress in dental adhesives bonded to dentin is transient.
- The degree of dentinal tubule opening significantly influences stress dissipation.
- Self-etching primer systems may offer better stress management due to less tubule interaction.
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