National Dental Assisting Examining Board (NDAEB) Practice Exam

What term describes the line where the alveolar membranes meet attached gingiva?

1. Mucogingival Junction

2. Palatine Fissure

3. Free Gingival Margin

4. Interdental Papilla

The correct answer is: Mucogingival Junction

The term that describes the line where the alveolar membranes meet the attached gingiva is known as the mucogingival junction. This anatomical landmark plays a crucial role in the oral cavity as it marks the transition between the keratinized gingival tissue, which is resilient and firm, and the non-keratinized alveolar mucosa, which is more delicate and flexible. Understanding the mucogingival junction is important in dental health because it can be a site of potential periodontal issues and plays a role in surgical considerations, particularly in procedures involving gum grafting or periodontal surgery where maintaining the integrity of the attached gingiva is essential for successful outcomes. The other terms provided do not refer to the same anatomical structure. The palatine fissure is related to the separation of the two palatine processes in the hard palate, while the free gingival margin refers to the edge of the gingiva that surrounds the teeth and is the point where the gums meet the teeth. The interdental papilla refers to the small pointed tissue found between the teeth, which helps in keeping the spaces clean. Each of these terms describes different aspects of oral anatomy, but none capture the specific location and significance of the mucogingival junction.