Phosphoric acid treatment enhances adaptation of glass‑ionomer cement to bioceramic sealer‑conditioned dentin

Abstract

Background: This study evaluated the interface between fresh eugenol/bioceramic
sealer‑conditioned coronal dentin and high‑viscous glass‑ionomer cement (HVGIC), treated with
various dentin conditioners (saline, 10% polyacrylic acid, and 37% phosphoric acid).
Materials and Methods: Standard endodontic access preparation and instrumentation were
done in 21 freshly extracted mandibular molar teeth in this in vitro study. Teeth were divided into
two interventional groups (n = 9/group), based on the type of sealer (zinc oxide eugenol [ZOE]/
bioceramic [BioRoot RCS] sealer) used for obturation. Samples were further subdivided based on
the type of dentin‑conditioning procedures performed (saline/10% polyacrylic acid/37% phosphoric
acid). Post dentin conditioning, the access cavity was sealed with HVGIC. Later, material‑dentin
interfacial analysis and elemental analysis were done using scanning electron microscopy (SEM) and
energy‑dispersive X‑ray spectroscopy.
Results: The interfacial SEM images of HVGIC layered over B‑RCS/ZOE sealer‑conditioned
dentin, treated with saline, showed predominantly adhesive debonding failures, whereas cohesive
debonding was observed with polyacrylic and phosphoric acid. In the elemental analysis, the
intensity of zirconium (depicting the residue of B‑RCS)/zinc (depicting ZOE sealer) was very high
on the dentin side treated with saline, in comparison to the dentin treated with polyacrylic and
phosphoric acid. Furthermore, the intensity of elements from HVGIC was low on the dentin side
of the groups with saline, whereas these elements showed maximum penetration into the dentin
when treated with phosphoric acid.
Conclusion: Conditioning of the endodontic access cavity using 37% phosphoric acid immediately
postobturation resulted in higher penetration of HVGIC into the dentin, in comparison to the
other dentin conditioners.
Key Words: Dentin, endodontics, glass‑ionomer cement, scanning electron microscopy,spectrometry

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Nandini Suresh: Pubmed,Google Scholar