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Effect of different bleaching systems on the ultrastructure of bovine dentin
Author(s) -
CarrascoGuerisoli Laise Daniela,
Schiavoni Renato Jonas dos Santos,
Barroso Juliana Machado,
Guerisoli Danilo Mathias Zanello,
Pécora Jesus Djalma,
Fröner Izabel Cristina
Publication year - 2009
Publication title -
dental traumatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.82
H-Index - 81
eISSN - 1600-9657
pISSN - 1600-4469
DOI - 10.1111/j.1600-9657.2008.00644.x
Subject(s) - opalescence , dentin , hydrogen peroxide , ultrastructure , enamel paint , chemistry , sodium perborate , dentistry , biochemistry , anatomy , biology , medicine , physics , quantum mechanics
– The aim of this study was to evaluate in vitro the effect of different in‐office bleaching systems on the surface morphology of bovine dentin. Thirty tooth fragments measuring 4 × 4mm, containing enamel and dentin, were obtained from the crowns of extracted bovine incisors. Samples were subjected to simulated intracoronal bleaching techniques using conventional (Opalescence Endo ® and Whiteness Super Endo ® ) and light‐activated systems (Opalescence Xtra ® and Whiteness HP Maxx ® ). Controls were treated with either sodium perborate mixed with 10% hydrogen peroxide or no bleaching agent. The samples were observed under SEM and the recorded images were evaluated for topographic alterations. The ultrastructural alterations of dentin observed in this study varied greatly between groups according to the products used. Higher pH products (Whiteness HP Maxx ® and Opalescence Xtra ® ) associated with in‐office techniques yielded better maintenance of dentin ultrastructure. Apparently, both low pH and hydrogen peroxide oxidation play a role in altering the ultrastructure of dentin during internal dental bleaching. The use of alkaline products with reduced time of application (in‐office techniques) may decrease such morphological alterations.