Author: Asst. Lecturer Basim Kareem Nasir
Introduction:
Adhesion is the process by which two different surfaces stick together through physical or chemical forces. In dentistry, adhesion plays a critical role in restorative treatments, especially in bonding dental materials to tooth structures.
Definition:
Adhesion in dentistry refers to the chemical and micromechanical attachment between restorative materials (such as composites, sealants, or cements) and the natural tooth structure (enamel and dentin).
Mechanism:
1. Micromechanical Retention: Adhesive penetrates into the rough surface of etched enamel or dentin, creating micro-tags that hold the material.
2. Chemical Bonding: Some adhesives form chemical bonds with hydroxyapatite or collagen in dentin.
Steps in Adhesive Dentistry:
Tooth surface preparation (etching with acid).
Application of primer to improve wetting.
Placement of adhesive resin.
Bonding of restorative material.
Advantages of Adhesion:
Preserves tooth structure (less need for mechanical retention).
Provides strong bond and reduces microleakage.
Improves esthetics and longevity of restorations.
Enhances patient comfort by sealing dentin tubules, reducing sensitivity.
Applications:
Composite restorations.
Veneers and crowns.
Orthodontic brackets.
Pit and fissure sealants.
Conclusion:
Adhesion in dentistry revolutionized modern restorative techniques by allowing conservative, esthetic, and durable treatments. Continuous advancements in adhesive systems are improving the strength and reliability of dental restorations.