Carranza’s Clinical Periodontology Twelfth Edition-Chapter 61

Caption: Figure 62-1. The Nabors probe in a Class II furcation of a dried skull.

Insight: A thorough clinical examination of teeth with furcation involvements is critical for developing the best treatment plan. In order to "really know" what's going on inside the furcation you must carefully probe it. Standard straight probes cannot always negotiate the defect so many people use the curved Nabors probe to enter and measure difficult to access furca areas.

Carranza’s Clinical Periodontology, 12th Ed
Chapter 61
Furcation Involvement and Treatment
Thomas Sims and Henry H. Takei