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Updated: Oct 3, 2026
Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
Published on: December 20, 2024
Interfacial micromorphology and tensile bond strength of dentin bonding systems after NaOCl treatment
T Pioch1, S Kobaslija, B Schagen
1University of Heidelberg, Department of Restorative Dentistry, Im Neuenheimer Feld 400, D-69120 Heidelberg, Germany. thomas_pioch@med.uni-heidelberg.de
Purpose:
The objective of this study was to test the hypothesis that NaOCl treatment of acid-etched dentin would not lower the tensile bond strength of adhesive resins, but would eliminate the hybrid layer.
Materials And Methods:
One hundred twenty teeth and three different bonding agents were used for SEM- and CLSM-visualization of the dentin-composite interface and for bond strength measurements. After etching with phosphoric acid, 75 dentin samples were pretreated with 10% NaOCl. The other 75 samples were etched only with phosphoric acid and were kept as controls. Composite was bonded to the pretreated surfaces with a bonding resin.
Results:
NaOCl-treated samples: hybrid layers were not visible, but resin tags and resin penetration through lateral branches of tubules were prominent. Layers of unfilled resin were not apparent for Gluma CPS and Prime & Bond 2.1. Hypochlorite treatment of acid-etched dentin resulted in reduced bond strengths for specimens bonded with Syntac and Gluma CPS, but such treatment increased bond strength for Prime & Bond 2.1 bonded specimens.
Conclusion:
The removal of the collagen layer with NaOCl can enhance or decrease bond strengths, depending on the bonding agent used.
