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Related Experiment Videos

Monomer-solvent phase separation in one-step self-etch adhesives.

K L Van Landuyt1, J De Munck, J Snauwaert

  • 1Leuven BIOMAT Research Cluster, Department of Conservative Dentistry, School of Dentistry, Oral Pathology and Maxillo-Facial Surgery, Catholic University of Leuven, Kapucijnenvoer 7, B-3000 Leuven, Belgium.

Journal of Dental Research
|January 26, 2005
PubMed
Summary

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One-step dental adhesives show lower bond strength due to ingredient phase separation. Improving bonding effectiveness involves strong air-drying to remove interfacial water and prevent droplet entrapment.

Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Adhesion Science

Background:

  • One-step dental adhesives exhibit reduced bonding effectiveness compared to multi-step systems.
  • Potential phase separation of adhesive ingredients may contribute to this disparity.

Purpose of the Study:

  • To investigate the cause of lower bond strength in one-step self-etch adhesives.
  • To characterize adhesive-material interactions with dentin and identify factors affecting bond durability.

Main Methods:

  • Examined 5 experimental and 3 commercial self-etch adhesives using transmission electron microscopy and light microscopy.
  • Assessed adhesive homogeneity and interfacial characteristics with dentin.
  • Determined bonding effectiveness using a micro-tensile bond-strength protocol.

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Main Results:

  • Lower bond strength in one-step adhesives correlated with observable, slowly disappearing droplets.
  • Interfacial analysis revealed droplet entrapment within the adhesive layer.
  • HEMA (2-hydroxyethyl methacrylate) addition or HEMA-containing agents eliminated droplets, suggesting monomer separation from water during solvent evaporation.

Conclusions:

  • Phase separation of adhesive monomers from water upon solvent evaporation leads to droplet entrapment, compromising bond durability.
  • Strong air-drying effectively removes interfacial water, preventing droplet formation and enhancing bonding effectiveness.
  • Optimizing adhesive formulation and application techniques can improve the clinical performance of one-step dental adhesives.