National Dental Assisting Examining Board (NDAEB) Practice Exam

What is the depth of a healthy gingival sulcus typically?

1. 1-2 mm

2. 2-3 mm

3. 3-4 mm

4. 4-5 mm

The correct answer is: 2-3 mm

The depth of a healthy gingival sulcus is typically around 1-3 mm, with 2-3 mm being the most common range. This measurement reflects optimal periodontal health, where the sulcus serves as a space between the tooth and the surrounding gum tissue. Healthy sulcus depths are associated with minimal bleeding on probing and the absence of periodontal disease, indicating that the gums are tightly adapted to the teeth without excessive pocket formation. The gingival sulcus depth can vary slightly among individuals and across different teeth, but depths greater than 3 mm are generally considered indicative of potential periodontal issues. Thus, identifying 2-3 mm as the normal range highlights the importance of maintaining healthy gingival architecture and preventing deeper sulci that could be associated with periodontal disease.