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Bioactive glass and high‐intensity lasers as a promising treatment for dentin hypersensitivity: An in vitro study
Author(s) -
Lee Ester M. R.,
Borges Roger,
Marchi Juliana,
Paula Eduardo Carlos,
Marques Márcia M.
Publication year - 2020
Publication title -
journal of biomedical materials research part b: applied biomaterials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.665
H-Index - 108
eISSN - 1552-4981
pISSN - 1552-4973
DOI - 10.1002/jbm.b.34446
Subject(s) - dentin , dentin hypersensitivity , dentinal tubule , irradiation , materials science , laser , bioactive glass , scanning electron microscope , smear layer , nuclear chemistry , composite material , chemistry , optics , physics , nuclear physics
This in vitro study aimed to analyze the physical and chemical characteristics of the hypersensitive human dentin‐like surface after application of a bioactive glass (BG) paste (BG/Ac) irradiated or not with high‐power lasers. Dentin specimens were treated with 17% Ethylenediamine tetraacetic acid (EDTA) solution to mimic a hypersensitive dentin and then submitted to neodymium: yttrium–aluminum–garnet (Nd:YAG) laser or CO 2 laser irradiation prior and after application of BG/Ac. Characterizations were performed by using X‐ray diffraction, Fourier transformed infrared spectroscopy, scanning electron microscopy, and energy dispersive X‐ray spectroscopy. The results suggested that application of BG/Ac by itself caused some obstructions of dentinal tubules. Nd:YAG laser irradiation reduced the opening of the dentinal tubules with no changes in the collagen structure. CO 2 laser irradiation caused dentin melting and resolidification along with cracks and chemical changes in collagen fibers. However, when BG/Ac paste was irradiated with lasers, a sequence of surface reactions between glass and dentin interface led to the formation of an amorphous hydroxyapatite layer, similar to that of an inorganic component of the normal dentin. Moreover, BG/Ac was able to prevent the formation of cracks and degradation of collagen fibers caused by CO 2 irradiation. Overall, this study supports that application of BG/Ac paste irradiated by high‐power laser could represent an effective and long‐lasting therapeutic approach for dentin hypersensitivity.