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Different root canal drying protocols for AH Plus Bioceramic Sealer: An in vitro study.

Andressa Weber Vargas1, Guilherme Pauletto1, Rafaela Oliveira Pilecco2

  • 1Department of Stomatology, Faculty of Dentistry, Federal University of Santa Maria, Santa Maria, Rio Grande do Sul, Brazil.

European Journal of Oral Sciences
|July 3, 2025
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Summary

Epoxy resin-based sealers (AHP) showed superior bond strength and marginal adaptation compared to bioceramic sealers (AHPB) in root canals. Drying protocols did not significantly affect bond strength for either sealer type.

Keywords:
AH Plusbioceramicsdrying protocolspush‐out

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Area of Science:

  • Endodontics
  • Dental Materials Science
  • Adhesive Dentistry

Background:

  • Root canal sealers are crucial for the success of endodontic treatment.
  • Bioceramic and epoxy resin-based sealers are commonly used, each with distinct properties.
  • Understanding sealer performance under varying canal conditions is essential for clinical application.

Purpose of the Study:

  • To compare the bond strength and adhesive interface of a bioceramic sealer (AHPB) and an epoxy resin-based sealer (AHP).
  • To evaluate the influence of different root canal drying protocols (dry, slightly moist, wet) on sealer bond strength.
  • To assess the effect of aging on the bond strength and failure modes of the sealers.

Main Methods:

  • Seventy-two single-rooted teeth were used with either AHPB or AHP sealer under dry, slightly moist, or wet conditions.
  • Push-out bond strength tests were performed immediately (1 week) and after aging (10,000 thermal cycles).
  • Failure mode analysis and adhesive interface analysis were conducted.

Main Results:

  • AH Plus (AHP) exhibited higher immediate bond strength than AH Plus Bioceramic Sealer (AHPB) in slightly moist and wet canals.
  • AHP demonstrated better marginal adaptation to root canal walls compared to AHPB.
  • No significant differences in bond strength were observed across drying protocols for either sealer immediately after application.
  • After aging, bond strength decreased in the AHP (wet) and AHPB (dry) groups.

Conclusions:

  • The epoxy resin-based sealer (AHP) showed superior immediate adhesive performance and marginal adaptation compared to the bioceramic sealer (AHPB).
  • Drying protocols did not significantly impact the immediate bond strength of either sealer.
  • Aging affected the bond strength of both sealers, with specific reductions noted in the AHP (wet) and AHPB (dry) groups.