Which of the following factors is assessed by the PSR system?

The PSR (Periodontal Screening and Recording) system is designed specifically to assess periodontal health and identify the need for further periodontal examination. The correct focus of the PSR system is on clinical measures such as pocket depth and bleeding on probing. These particular indicators provide crucial information about the periodontal condition of the patient, revealing signs of inflammation and potential attachment loss.

Pocket depth gives insight into the severity of periodontal disease, while bleeding on probing indicates the presence of active inflammation in the periodontal tissues. This combination allows for the identification of patients who may have gingival diseases or are at risk for periodontitis, thus guiding clinicians on whether to proceed with more comprehensive treatment or observation.

In contrast, factors such as tooth color and shape, presence of plaque and calculus, and crown-to-root ratio are important in the overall assessment of oral health but are not primary focuses of the PSR. The PSR particularly emphasizes pocket depth and bleeding, as they directly relate to periodontal health status.