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Related Experiment Video

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Bonding over Dentin Replacement Materials.

Naghmeh Meraji1, Josette Camilleri2

  • 1Department of Endodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.

Journal of Endodontics
|July 1, 2017
PubMed
Summary

Bonding composite resin to dentin replacement materials is challenging. Theracal LC showed the best bond strength, while Biodentine failed, highlighting the need for improved restorative materials.

Keywords:
BiodentineTheracal LCcharacterizationdentin replacement materialsdynamic testingelemental mappingglass ionomer cementshear bond strength

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Restorative Dentistry

Background:

  • Dentin replacement materials are crucial for protecting pulp in large cavities and reducing restorative material bulk.
  • Poor bonding between composite resin and dentin replacement materials can lead to microleakage and pulp damage.
  • Characterizing interfaces and assessing bond strength after dynamic aging is vital for clinical success.

Purpose of the Study:

  • To characterize the interface between three dentin replacement materials and overlying restorative materials.
  • To measure the shear bond strength of these combinations after dynamic aging (thermocycling).
  • To evaluate the impact of different bonding agents on bond durability.

Main Methods:

  • Biodentine, Theracal LC, and Fuji IX were used as dentin replacement materials.
  • Materials were overlaid with either a total-etch/bonding agent or a self-etch primer and composite resin or glass ionomer cement.
  • Interfaces were analyzed using scanning electron microscopy and elemental mapping; shear bond strength was tested after 3000 thermocycles.

Main Results:

  • Biodentine surface altered with etching; Theracal LC and Fuji IX microstructures remained unchanged.
  • Biodentine-glass ionomer interface showed gaps with adhered glass particles; elemental migration into Biodentine observed.
  • Theracal LC with total-etch and self-etch primer yielded the highest bond strength; Biodentine exhibited the weakest bond, failing after thermocycling.

Conclusions:

  • Dynamic aging is essential for clinically relevant bond strength data.
  • Achieving durable bonds between composite resins and water-based dentin replacement materials remains a significant challenge.
  • Development of novel restorative materials and bonding strategies is necessary for improved clinical outcomes.