Which probe is used to measure furcation involvement?

The NABERS PROBE (furcation probe) is a curved/angled probe specifically designed to detect and measure FURCATION INVOLVEMENT in multi-rooted teeth. Its curved design allows it to navigate into the furcation area that a straight probe cannot access. The STRAIGHT probe measures pocket depths. The BRIAULT probe (curved sickle-shape) detects subgingival calculus and root caries. The WHO probe has a ball tip for BOP. B (Nabers) is correct for furcation.