Which of the following instruments is typically used for periodontal treatment?

In the context of periodontal treatment, understanding the roles of different dental instruments is essential. Each instrument listed plays a significant part in the overall management of periodontal health.

The hand mirror is primarily a diagnostic tool used to provide visibility of the oral cavity, and while it's not directly involved in the treatment process, it is an important adjunct to enhance visibility during procedures.

A sickle scaler is specifically designed for the manual removal of dental calculus from above the gum line. It's ideal for cleaning areas that are accessible and serves a critical purpose in maintaining periodontal health by facilitating the removal of plaque and tartar.

Curettes are also crucial in periodontal treatment as they are designed for debriding both supragingival and subgingival surfaces. They have a rounded tip that allows for a gentler approach when accessing deeper pockets around teeth, making them effective for maintaining periodontal health.

Therefore, upon reviewing these instruments, it becomes clear that they each have a role in periodontal treatment, with the hand mirror enhancing visibility while the sickle scaler and curette are directly involved in the removal of calculus and plaque. This comprehensive support from all these instruments validates the option that all of them are relevant to periodontal treatment.