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Evaluation of etching time on dentin bond strength using single bottle bonding systems
Amer Abu-Hanna1, Valeria V Gordan
1Department of Operative Dentistry, College of Dentistry, University of Florida, Health Science Center, Gainsville, Florida, 32610-0415, USA. aabuhanna@dental.ufl.edu
The Journal of Adhesive Dentistry
|August 6, 2004
Summary
Reducing dentin etching time to 5 seconds does not negatively impact dentin bonding strength for most agents. This finding suggests that shorter etching protocols can be effective in dental bonding procedures.
Area of Science:
- Dental materials science
- Adhesive dentistry
- Biomaterials engineering
Background:
- Incomplete infiltration of demineralized collagen networks can create weak zones in the hybrid layer.
- This weakness can compromise the bond between dental restorative materials and dentin.
Purpose of the Study:
- To evaluate the effect of reduced (5 s) and increased (30 s) dentin etching times compared to the standard 15 s.
- To assess the impact on dentin bond strength using different bonding agents.
Main Methods:
- 108 extracted molars were divided into three bonding agent groups: Single Bond (SB), One-Step (OS), and Syntac Single Component (SSC).
- Each group was further subdivided into three subgroups with etching times of 5, 15, or 30 seconds.
- Specimens underwent thermocycling and shear bond strength testing.
Main Results:
- Single Bond (SB) and One-Step (OS) showed no significant differences in bond strength across etching times (5, 15, 30 s).
- Syntac Single Component (SSC) exhibited significantly lower bond strengths with longer etching times (15 s and 30 s) compared to 5 s.
- Failure modes for SB and OS were primarily adhesive or mixed, while SSC failures were all adhesive.
Conclusions:
- Etching times of 5 seconds do not appear to adversely affect dentin bonding for SB and OS.
- Shorter etching times may be a viable option, potentially improving clinical efficiency without compromising bond integrity for certain adhesive systems.