Which instrument is used to measure the horizontal and vertical pocket depth of multirooted teeth?

Question

Quizplus · Accepted Answer

Furcation probes are used to measure horizontal and vertical pocket depths of multirooted teeth in furcation areas.
The periodontal probe is used to measure the depth of the gingival sulcus.
The periodontal explorer is used to locate deposits of calculus.
The pocket marker is used to mark the area for an incision on the gingiva.

Which Instrument Is Used to Measure the Horizontal and Vertical