Dental-enamel junction

Dental-Enamel Junction

The Dental-Enamel Junction (DEJ), also known as the Dentinoenamel Junction, is a critical interface in the tooth structure, marking the boundary between the enamel and dentin tissues. It plays a significant role in tooth function and health, and its understanding is essential in various fields of dentistry.

Structure

The Dental-Enamel Junction is a unique boundary within the tooth, characterized by a sharp transition from the hard, highly mineralized enamel to the softer, organic-rich dentin. The DEJ is not a distinct layer but a transition zone where enamel rods meet dentin tubules. The structure of the DEJ is complex and varies between individuals and even within a single tooth.

Function

The DEJ serves several important functions. It provides a strong bond between the enamel and dentin, which is crucial for the tooth's mechanical integrity. The DEJ also acts as a barrier to the spread of caries (tooth decay), as it is more resistant to caries than either enamel or dentin.

Clinical significance

Understanding the DEJ is important in various aspects of dentistry. In restorative dentistry, the DEJ is a critical factor in the success of dental fillings and dental crowns. In endodontics, the DEJ helps guide the preparation of the root canal. In orthodontics, the DEJ is a reference point for tooth movement.

Research

Research on the DEJ is ongoing, with studies focusing on its structure, function, and role in dental diseases. Recent research has also explored the potential for using the DEJ as a model for developing new biomaterials.

See also

• Tooth development
• Tooth enamel
• Dentin
• Dental caries