Effects of acidic primer/adhesives on primary and permanent dentin.
OBJECTIVE
To evaluate the quality of primary and permanent dentin by Fourier transformed Raman spectroscopy (FT-Raman), and scanning electron microscopy/energy-dispersive spectroscopy (SEM/EDS).


METHODS
The middle dentin of crowns was reached by carbide bur abrading providing a uniform smear layer. Self-etching primers were applied in order to simulate the etching of self-etching adhesive systems. The groups were (n = 6): G1 (primary dentin smear layer); G2 (primary dentin etched by primer of Clearfil Protect Bond); G3 (primary dentin etched by Adper Prompt); G4 (permanent dentin smear layer); G5 (permanent dentin etched by primer of Clearfil Protect Bond); G6 (permanent dentin etched by Adper Prompt). SEM/EDS were made in order to obtain additional elemental data to complement FT-Raman. FT-Raman data were submitted to cluster analysis.


RESULTS
Overall, FT-Raman showed differences between primary and permanent dentin concerning organic content, but not for inorganic content. FT-Raman showed differences in the organic content between primary and permanent dentin after self-etching primer use. HEMA usage caused molecular changes in the organic content, while phosphoric acidic ester caused molecular changes in the inorganic content of primary and permanent dentin. The SEM/EDS identified C, O, P, and Ca, which could not replace ions to change mineral molecular arrangement. Both organic and mineral content arrangements were similar after self-etching primers action. The organic content of dentin was modified by both Clearfil PB primer and Adper Prompt for primary dentin but only by Clearfil PB for permanent dentin. The inorganic content of primary middle dentin was similar to the inorganic content of permanent middle dentin, even when Adper Prompt is used.
Borges
Ana Flávia Sanches
AF
Latin American Institute of Research and Teaching in Dentistry, Brazil.
Puppin-Rontani
Regina Maria
RM
Bittar
Renata Andrade
RA
Kantowitz
Kamila Rosamilia
KR
Pascon
Fernanda Miori
FM
Martin
Airton Abrahão
AA
D000134:Acid Etching, Dental / Q000379:methods*; D017438:Bisphenol A-Glycidyl Methacrylate / Q000494:pharmacology; D016000:Cluster Analysis; D003804:Dentin / Q000737:chemistry* / Q000187:drug effects*; D017220:Dentin-Bonding Agents / Q000494:pharmacology; D019229:Dentition, Permanent; D004577:Electron Probe Microanalysis / Q000379:methods; D006801:Humans; D008963:Molar; D015394:Molecular Structure; D010755:Organophosphates / Q000494:pharmacology; D010756:Phosphoric Acids / Q000494:pharmacology; D025341:Principal Component Analysis; D019279:Resin Cements / Q000494:pharmacology*; D013059:Spectrum Analysis, Raman; D014094:Tooth, Deciduous
C489661:Adper Prompt Self-Etch; C503075:Clearfil Protect Bond; D017220:Dentin-Bonding Agents; D010755:Organophosphates; D010756:Phosphoric Acids; D019279:Resin Cements; D017438:Bisphenol A-Glycidyl Methacrylate; C030242:phosphoric acid