What is meant by micro-mechanical retention?

Micro-mechanical retention refers to the process by which restorative materials, such as dental composites or adhesives, bond to tooth structure by interlocking with the microscopic irregularities present on the surface of the tooth. This type of retention is essential in dentistry for ensuring that restorations remain securely in place over time.

When a dental restoration is placed, it is often necessary for the material to adhere not only to the external surface of the tooth but also to form a bond within the tiny imperfections or pits on the enamel and dentin surfaces. This interlocking mechanism creates a strong bond that enhances the stability and longevity of the restoration. Therefore, the concept of micro-mechanical retention directly involves the relationship and interaction between the tooth's surface and the restorative material.

In contrast, direct bonding of braces pertains to orthodontic techniques and does not focus on micro-mechanical principles. A type of chemical bond in restorations refers to different bonding mechanisms, such as chemical adhesion, which differs from the micro-mechanical concept. Retention through dental cements primarily involves different types of adhesion and does not specifically address the mechanical interlocking nature of micro-mechanical retention.