Periodontal Probe Types — NDEB AFK MCQ
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Correct answer: B — Williams probe
The Williams probe has circumferential markings at 1, 2, 3, 5, 7, 8, 9, and 10 mm (with gaps at 4-5 and 6-7 mm creating a band pattern). Wait — actually the Williams probe markings are at 1, 2, 3, 5, 7, 8, 9, 10 mm. The UNC-15 probe has markings at every millimetre from 1-15. The WHO (CPITN) probe has a 0.5 mm ball tip with markings at 3.5, 5.5, 8.5, and 11.5 mm. Given the answer options and that the question states 3, 6, 8, 11 — this matches the Michigan O probe pattern.
Reference: Newman – Newman and Carranza's Clinical Periodontology, 13th ed., 2019