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New method evaluates coupling agents bonding polymer to tooth mineral
Journal of Dental Research
|October 1, 1977
Summary
This study shows that higher filler concentrations in Bis-GMA composites reduce tensile strength. Effective coupling agents minimize this strength reduction, aiding material classification and environmental impact assessment.
Area of Science:
- Materials Science
- Polymer Chemistry
- Biomaterials Engineering
Background:
- Bis-GMA resins are widely used in dental composites.
- Synthetic hydroxyapatite is a common filler material.
- Coupling agents are crucial for filler-matrix adhesion.
Purpose of the Study:
- To investigate the effect of filler concentration on the tensile strength of Bis-GMA/hydroxyapatite composites.
- To evaluate the efficacy of different coupling agents in improving composite properties.
- To propose a method for classifying coupling agents and assessing environmental degradation.
Main Methods:
- Polymerized test specimens were prepared using a Bis-GMA matrix and synthetic hydroxyapatite filler.
- Filler particles were pre-coated with various coupling agents.
- Tensile strength testing was performed on specimens with varying filler concentrations.
Main Results:
- Increasing filler concentration led to a decrease in tensile strength for all coupling agents.
- More effective coupling agents resulted in a less significant decrease in tensile strength.
- A correlation was observed between coupling agent effectiveness and the reduction in tensile strength.
Conclusions:
- Coupling agent effectiveness directly influences the mechanical integrity of Bis-GMA/hydroxyapatite composites.
- The proposed method can classify coupling agents based on their performance.
- This approach can assess the impact of environmental factors on composite weakening.