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Bonding of low-shrinking composites in high C-factor cavities
A Van Ende1, A Mine, J De Munck
1KU Leuven-BIOMAT, Department of Oral Health Sciences, KU Leuven (University of Leuven), Belgium.
Journal of Dentistry
|January 26, 2012
Summary
The two-step self-etch adhesive performed better than the one-step adhesive, especially with layering techniques. Low-shrinking composites combined with layering methods enhance bond strength in high C-factor cavities.
Area of Science:
- Dental Materials Science
- Restorative Dentistry
- Polymer Chemistry
Background:
- Polymerization shrinkage in dental composites generates stress at the tooth-restoration interface.
- Cavity configuration factor (C-factor), polymerization rate, and filling technique influence shrinkage stress magnitude.
Purpose of the Study:
- To evaluate the impact of curing time and filling method on low-shrinking composites in high C-factor cavities.
- To compare the effectiveness of different adhesive systems and composite types under varying application techniques.
Main Methods:
- Three low-shrinking composites (Filtek Silorane, N'Durance, Kalore) and one conventional composite (Z100) were tested.
- Standardized occlusal Class-I cavities were filled using a two-step self-etch (Silorane System Adhesive) or one-step self-etch (G-Bond) adhesive.
- Groups were further divided by curing time (20s/80s) and filling technique (bulk/layered) to measure micro-tensile bond strength (μTBS).
Main Results:
- The two-step self-etch adhesive (SSA) consistently yielded higher bond strengths than the one-step self-etch adhesive (GB).
- When using GB, bulk filling with low-shrinking composites resulted in the highest bond strengths.
- The layering technique consistently produced the highest bond strengths across all tested composites.
Conclusions:
- The two-step self-etch adhesive (Silorane System Adhesive) demonstrated superior performance compared to the one-step self-etch adhesive (G-Bond).
- Shrinkage stress effects were more pronounced when using the one-step all-in-one adhesive.
- Optimizing filling techniques and adhesive selection is crucial for minimizing stress in high C-factor restorations.
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