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Relationship between adhesive thickness and microtensile bond strength
L Zheng1, P N Pereira, M Nakajima
1Cariology and Operative Department of Restorative Sciences, Graduate School, Tokyo Medical and Dental University, 5-45 Yushima, 1-chome, Bunkyo-ku, Tokyo 113-8549, Japan.
Operative Dentistry
|February 24, 2001
Summary
The thickness of adhesive resin layers significantly impacts dental bonding strength. Clearfil Liner Bond 2V showed increased bond strength with thicker layers, while Single Bond exhibited decreased strength.
Area of Science:
- Dental Materials Science
- Adhesive Dentistry
- Biomaterials Engineering
Background:
- Dental adhesive systems are crucial for restoring tooth structure.
- Understanding the influence of adhesive layer thickness on bond strength is vital for clinical success.
- Two distinct bonding systems, Single Bond and Clearfil Liner Bond 2V, were investigated due to their differing solvent compositions and application techniques.
Purpose of the Study:
- To evaluate the effect of varying adhesive resin layer thicknesses on the bond strengths of two commercial dental bonding systems.
- To compare the behavior of a solvent-based (Single Bond) and a solvent-free (Clearfil Liner Bond 2V) adhesive system concerning layer thickness and bond strength.
Main Methods:
- Forty-six human molars were prepared to expose dentin, and bonding areas were defined using vinyl tape.
- Adhesive layer thickness was manipulated by stacking multiple layers of vinyl tape.
- Teeth were bonded with either Clearfil Liner Bond 2V or Single Bond, restored with composite resin, and subjected to microtensile bond testing after storage.
- Statistical analysis included one-way ANOVA and linear regression.
Main Results:
- Adhesive layer thickness ranged from <7.5 mm to 1500 mm for Single Bond and Clearfil Liner Bond 2V.
- For Clearfil Liner Bond 2V, bond strength significantly increased with increasing adhesive layer thickness (p < 0.05).
- Conversely, for Single Bond, bond strength significantly decreased as the adhesive layer thickness increased (p < 0.05).
Conclusions:
- The optimal adhesive resin layer thickness for achieving maximum bond strength differs between solvent-based and solvent-free dental bonding systems.
- Clinicians should consider the specific properties of adhesive systems, such as solvent content and application method, when managing layer thickness for predictable bonding outcomes.
- Further research may explore the microstructural changes associated with varying adhesive layer thicknesses and their long-term effects on bond durability.