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Triacrylamide-Based Adhesives Stabilize Bonds in Physiologic Conditions.

F S de Lucena1, S H Lewis2, A P P Fugolin2

  • 1Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil.

Journal of Dental Research
|January 10, 2022
PubMed
Summary

This study developed a new acrylamide adhesive and thiourethane composite for dental restorations. The advanced materials significantly improved bond stability and reduced gaps, even under bacterial and mechanical challenges.

Keywords:
acrylamidesbiofilmdental adhesivesdental restoration failuresmechanical testingtooth demineralization

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Area of Science:

  • Biomaterials Science
  • Dental Materials Science
  • Polymer Chemistry

Background:

  • Dental composite restorations are prone to degradation under physiological challenges.
  • Polymerization stress and bond degradation impact restoration longevity.
  • Novel adhesive and composite formulations are needed to enhance stability.

Purpose of the Study:

  • To evaluate the stability of a novel acrylamide-based adhesive and thiourethane-modified composite.
  • To assess the impact of mechanical and bacterial challenges on restoration integrity.
  • To compare the performance of a triacrylamide (TMAAEA) adhesive against a control (HEMA).

Main Methods:

  • Formulation of a 2-step total-etch adhesive system using urethane dimethacrylate with TMAAEA or HEMA.
  • Development of methacrylate-based composites with thiourethane oligomers.
  • Restoration of human molars, followed by storage in water or Streptococcus mutans biofilm.
  • Testing under static (incubator) and dynamic (bioreactor) conditions with SEM and CLSM analysis.
  • Microtensile bond strength testing before and after storage.

Main Results:

  • Acrylamide-based adhesives showed more efficient initial bonding with smaller gap formation.
  • The TMAAEA adhesive maintained smaller gaps under static and dynamic conditions in water.
  • The acrylamide/thiourethane combination demonstrated significantly lower gap formation in the bioreactor with biofilm.
  • TMAAEA-based adhesives retained initial bond strength after 7-day biofilm challenge, unlike HEMA-based adhesives.

Conclusions:

  • A stable multiacrylamide-based adhesive preserves the resin-dentin interface under physiologically relevant challenges.
  • The combination of acrylamide adhesive and thiourethane composite offers improved bond stability.
  • Future research should explore multispecies biofilm models for more comprehensive testing.