Primary dentin etching time, bond strength and ultra-structure characterization of dentin surfaces

Raquel Osorio, Fátima S. Aguilera, Pilar R. Otero, Martín Romero, Estrella Osorio, Franklin Garcia-Godoy, Manuel Toledano

Research output: Contribution to journalArticle

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Abstract

Objectives: To evaluate the effect of shortening the etching time on roughness, microhardness and bond strength of three adhesive systems to primary tooth dentin. Methods: Flat dentin surfaces from primary molars were randomly assigned to six experimental groups. Three different adhesive systems were used: an etch-and-rinse adhesive (Single Bond), a two-step self-etching (Clearfil SE Bond), and a one-step self-etching (One-Up Bond F) adhesive. In half of the specimens, the recommended etching time was used, in the other half the etching time was 50% reduced. After applying the adhesive, resin composite build-ups were constructed and stored in a humid environment for 24 h at 37 °C. Specimens were sectioned into 1 mm2 beams and tested for microtensile bond strength (MTBS). Debonded surfaces were analyzed by scanning electron microscopy (SEM). Additional surfaces were conditioned for microhardness measurements (KHN) and for atomic force microscopy (AFM) analysis. Intertubular and total surface roughness (Ra) were recorded. Results were analyzed with ANOVA and Student-Newman-Keuls tests (P < 0.05). Results: Single Bond and Clearfil SE Bond showed higher MTBS than One-Up Bond F. Bond strength and intertubular roughness increased when Single Bond and One-Up Bond F were used with a reduced etching time. For Clearfil SE Bond no differences in MTBS were detected when reducing the etching time. The application of phosphoric acid, Clearfil SE Bond primer and One-Up Bond F decreases dentin microhardness. Conclusions: Shortening One-Up Bond F application time and reducing the etching time of phosphoric acid to one-half of the manufacturer's recommended etching time when using Single Bond are recommended when bonding to primary dentin.

Original languageEnglish (US)
Pages (from-to)222-231
Number of pages10
JournalJournal of Dentistry
Volume38
Issue number3
DOIs
StatePublished - Mar 1 2010

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Dentin
Adhesives
Deciduous Tooth
Composite Resins
Atomic Force Microscopy
Electron Scanning Microscopy
Analysis of Variance
One-Up-Bond F
Students
Clearfil SE Bond
single bond

All Science Journal Classification (ASJC) codes

  • Dentistry(all)

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Primary dentin etching time, bond strength and ultra-structure characterization of dentin surfaces. / Osorio, Raquel; Aguilera, Fátima S.; Otero, Pilar R.; Romero, Martín; Osorio, Estrella; Garcia-Godoy, Franklin; Toledano, Manuel.

In: Journal of Dentistry, Vol. 38, No. 3, 01.03.2010, p. 222-231.

Research output: Contribution to journalArticle

Osorio, Raquel ; Aguilera, Fátima S. ; Otero, Pilar R. ; Romero, Martín ; Osorio, Estrella ; Garcia-Godoy, Franklin ; Toledano, Manuel. / Primary dentin etching time, bond strength and ultra-structure characterization of dentin surfaces. In: Journal of Dentistry. 2010 ; Vol. 38, No. 3. pp. 222-231.
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abstract = "Objectives: To evaluate the effect of shortening the etching time on roughness, microhardness and bond strength of three adhesive systems to primary tooth dentin. Methods: Flat dentin surfaces from primary molars were randomly assigned to six experimental groups. Three different adhesive systems were used: an etch-and-rinse adhesive (Single Bond), a two-step self-etching (Clearfil SE Bond), and a one-step self-etching (One-Up Bond F) adhesive. In half of the specimens, the recommended etching time was used, in the other half the etching time was 50{\%} reduced. After applying the adhesive, resin composite build-ups were constructed and stored in a humid environment for 24 h at 37 °C. Specimens were sectioned into 1 mm2 beams and tested for microtensile bond strength (MTBS). Debonded surfaces were analyzed by scanning electron microscopy (SEM). Additional surfaces were conditioned for microhardness measurements (KHN) and for atomic force microscopy (AFM) analysis. Intertubular and total surface roughness (Ra) were recorded. Results were analyzed with ANOVA and Student-Newman-Keuls tests (P < 0.05). Results: Single Bond and Clearfil SE Bond showed higher MTBS than One-Up Bond F. Bond strength and intertubular roughness increased when Single Bond and One-Up Bond F were used with a reduced etching time. For Clearfil SE Bond no differences in MTBS were detected when reducing the etching time. The application of phosphoric acid, Clearfil SE Bond primer and One-Up Bond F decreases dentin microhardness. Conclusions: Shortening One-Up Bond F application time and reducing the etching time of phosphoric acid to one-half of the manufacturer's recommended etching time when using Single Bond are recommended when bonding to primary dentin.",
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AU - Osorio, Raquel

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AU - Otero, Pilar R.

AU - Romero, Martín

AU - Osorio, Estrella

AU - Garcia-Godoy, Franklin

AU - Toledano, Manuel

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