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Effect of the calcium silicate‐based sealer removal protocols and time‐point of acid etching on the dentin adhesive interface
Author(s) -
Morais Jéssika Mayhara Pereira,
Victorino Keli Regina,
EscalanteOtárola Wilfredo Gustavo,
JordãoBasso Keren Cristina Fagundes,
PalmaDibb Regina Guenka,
Kuga Milton Carlos
Publication year - 2018
Publication title -
microscopy research and technique
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.536
H-Index - 118
eISSN - 1097-0029
pISSN - 1059-910X
DOI - 10.1002/jemt.23056
Subject(s) - dentin , adhesive , smear layer , bond strength , scanning electron microscope , dentistry , calcium silicate , chemistry , nuclear chemistry , materials science , composite material , layer (electronics) , medicine
The aim of the study was to evaluate the effects when acid etching on the dentin surface was immediately performed (I) or 7 days (D) after calcium silicate‐based sealer (MTA Fillapex) removal, using 95% ethanol (E) or xylol (X). First study, 60 bovine incisor dentin specimens were impregnated with sealer and divided into six groups ( n = 10): (EI), E + I; (XI), X + I; (ED), E + D; (XD), X + D, (UN), untreated and (MR), mechanical removal of sealer. Scanning electron microscopy (SEM) images (500×) were obtained from each specimen and scores assessed the sealer residues persistence. Second study, 60 specimens were similarly treated; however, the specimens were restored with composite resin after the removal protocols. Hybrid layer formation was evaluated using confocal laser microscopy (1,024×). Third study, 60 specimens were similarly obtained and subjected to micro‐shear test to evaluate the effects of removal protocols on the bond strength of etch‐and‐ rinse adhesive system to dentin. XI showed the highest persistence of sealer residues ( p < .05), similar to MR ( p > .05). EI showed the greatest hybrid layer extension, except in relation to UN ( p < .05). XI and MR presented the lowest bond strength adhesive system to dentin ( p < .05). Acid etching immediately after calcium silicate‐based endodontic sealer removal using xylol presented the highest residues persistence and negatively affected the adhesive interface between dentin and etch‐and‐rinse adhesive system.