A photoacoustic FTIRS study of the chemical modifications of human dentin surfaces:: II. Deproteination

This work focuses on the chemical alterations occurring on the dentin surface on treatment with sodium hypochlorite (NaOCl), a known deproteinating agent. In addition, sequential treatment with both acid and NaOCl are characterized. Modifications are evaluated using photoacoustic FTIR (PA-FTIRS), a...

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Bibliographic Details
Published in:Biomaterials 2001-04, Vol.22 (8), p.793-797
Main Authors: Di Renzo, M., Ellis, T.H., Sacher, E., Stangel, I.
Format: Article
Language:English
Subjects:
Acid etching
Acid Etching, Dental
Acoustics
Adhesiveness
Biological and medical sciences
Chemical modifications
Dental Cements
Dentin - chemistry
Dentin deproteination
deproteination
Humans
In Vitro Techniques
Materials Testing
Medical sciences
Photoacoustic infrared spectroscopy
Photochemistry
Proteins - isolation & purification
Radiotherapy. Instrumental treatment. Physiotherapy. Reeducation. Rehabilitation, orthophony, crenotherapy. Diet therapy and various other treatments (general aspects)
Sodium Hypochlorite
Spectroscopy, Fourier Transform Infrared - methods
Surface Properties
Technology. Biomaterials. Equipments. Material. Instrumentation
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Summary:This work focuses on the chemical alterations occurring on the dentin surface on treatment with sodium hypochlorite (NaOCl), a known deproteinating agent. In addition, sequential treatment with both acid and NaOCl are characterized. Modifications are evaluated using photoacoustic FTIR (PA-FTIRS), a surface-sensitive spectroscopy. Spectra of NaOCl-treated dentin samples show a slow and heterogeneous removal of its organic phase, leaving calcium hydroxyapatite and carbonate apatite unchanged. Spectra of this deproteinated surface resemble those of apatites synthesized at low temperatures and having very high-surface areas. A combined sequential 2-min treatment of dentin with both maleic acid and NaOCl indicates that this treatment can produce a surface region which is neither significantly demineralized nor deproteinated. This sequential treatment can be used to remove the smear layer and restore the dentin surface to its natural composition.
ISSN:0142-9612
1878-5905
DOI:10.1016/S0142-9612(00)00239-8