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Self-etching bonding systems: in-vitro shear bond strength evaluation.
P D Brandt1, F A de Wet, I C du Preez
1Division of Dental Materials, School of Dentistry, University of Pretoria. pbrandt@medic.up.ac.za
Summary
This study compared self-etching dental bonding agents to a total-etch control. Clearfil SE Bond, ABF, and Optibond Solo Self-etch showed comparable dentine shear bond strength to the control.
Area of Science:
- Dental Materials Science
- Adhesive Dentistry
- Biomaterials Engineering
Background:
- Self-etching bonding agents offer simplified clinical application compared to traditional total-etch systems.
- Evaluating the dentine shear bond strength (SBS) of self-etching agents is crucial for their clinical efficacy.
- Standardized smear layer preparation is essential for reproducible in vitro bond strength testing.
Purpose of the Study:
- To compare the in vitro dentine shear bond strength (SBS) of five self-etching bonding agents against a total-etch control.
- To determine which self-etching agents exhibit comparable or superior bond strength to a conventional total-etch system.
- To provide data for selecting effective dentine bonding agents in restorative dentistry.
Main Methods:
- Sixty human third molars were prepared to expose superficial dentine with a standardized smear layer.
- Five self-etching agents (Xeno III, Clearfil SE Bond, ABF, Optibond Solo Self-etch, Adper Prompt-L-Pop) and one total-etch control (Scotchbond Multipurpose Plus) were tested.
- Resin stubs were bonded to dentine, and shear bond strength was measured using an Instron testing machine at 0.5 mm/min crosshead speed.
Main Results:
- Clearfil SE Bond (26.2 MPa), ABF (25.9 MPa), and Optibond Solo Self-etch (21.9 MPa) demonstrated shear bond strengths comparable to the control (Scotchbond Multipurpose Plus, 24.1 MPa).
- Xeno III (17.3 MPa) and Adper Prompt-L-Pop (15.4 MPa) exhibited significantly lower shear bond strengths than the control (p < 0.05).
- Statistical analysis using ANOVA confirmed significant differences among the tested bonding agents.
Conclusions:
- Clearfil SE Bond, ABF, and Optibond Solo Self-etch are viable alternatives to the tested total-etch system, offering comparable dentine bond strength.
- Xeno III and Adper Prompt-L-Pop may have limitations in achieving optimal dentine bond strength in this in vitro model.
- Further research is recommended to evaluate enamel bond strength and micro-leakage for these agents.