Sistemas Adesivos e Adesão - Princípios de Adesão
Adhesion Systems in Dentistry
In this section, the focus is on adhesion systems in dentistry, specifically exploring the concept of adhesion and its importance in bonding two substances together.
Understanding Adhesion
- Adhesion involves the intimate contact between three surfaces.
- Efficient adhesion depends on the close contact between the adhesive and a substrate.
- The concept of adhesion is detailed in the book "Restorative Dentistry: Fundamentals and Techniques" by Professor Barat.
Wetting and Surface Energy
- Wetting refers to how a liquid spreads over a surface.
- Wetting is influenced by the angle of contact formed between the liquid adhesive and the solid substrate.
- Lower contact angles indicate better wetting and improved adhesion efficiency.
Surface Tension and Free Surface Energy
- Surface tension and free surface energy play crucial roles in wetting.
- Higher free surface energy of the substrate enhances wetting and promotes better adhesion.
- Professionals can enhance surface energy through products applied to the substrate.
Enhancing Adhesion Efficiency
This section delves into practical examples to illustrate how enhancing surface energy can improve adhesion efficiency.
Practical Application Example
- Applying white glue on cardboard demonstrates enhanced adhesion when spread over a larger area.
- Complete spreading of adhesive increases mobility, leading to more efficient bonding.
Importance of Spreading Adhesive
- Spreading adhesive over a larger area improves bonding efficiency compared to applying it only at specific points.
- Proper spreading ensures effective adhesion across surfaces for optimal results.
Application Techniques for Adhesives
This part emphasizes proper techniques for applying adhesives to ensure effective bonding without compromising efficiency.
Microbrushes for Application
- Utilize disposable microbrushes for even spreading of adhesive within cavity preparations.
- Avoid using air from triple syringes for spreading as it may disrupt already applied adhesive areas, reducing bond effectiveness.
Final Cavity Appearance
- The cavity's final appearance should exhibit a superficial shine on all surrounding walls, indicating proper application of adhesive.