Why 4 and 6 markings are not present in Williams graduated probe?

The absence of 4 and 6 markings on the Williams graduated probe is primarily due to its design intended for specific dental measurements. The probe typically features markings at intervals that correspond to common periodontal assessment depths, which are more relevant in clinical practice. Additionally, the standardization of markings aids in consistency and accuracy during examinations, focusing on the most critical measurements for dental health assessment.