A periodontal pocket marker appears similar in design to:

The periodontal pocket marker is similar in design to a periodontal probe because both instruments share a similar elongated and pointed design. They are both used in the assessment of periodontal health, although their specific functions differ. The periodontal pocket marker is specifically employed to identify the depth of periodontal pockets by creating small markings or indentations in the gingival tissue. This allows a clinician to visualize the areas that may require further examination or treatment.

In contrast, a periodontal probe, which may also bear a resemblance to the marker, includes measurement markings along its length and is used for actual probing into the periodontal pocket to measure its depth. While the two tools can appear similar, the unique characteristic of the pocket marker is its purpose of marking rather than measuring.

The other choices, such as thumb forceps and cotton pliers, serve very different functions in dental practice, primarily pertaining to tissue manipulation and material placement. A gracey scaler, typically used for scaling plaque and calculus from the teeth, also has a different design and function compared to a pocket marker. Thus, the similarity in design and function among pocket markers and probes relates specifically to their roles in periodontal examinations.