Reliability of a Novel CBCT-Based 3D Classification System for Maxillary Canine Impactions in Orthodontics: The KPG Index

Figure 4

Occlusal reference arch (𝑧); axial view. In this example 𝐶_𝑧=0 and 𝑅_𝑧=0; therefore the KPG index value is 12—moderate difficulty (5+5+2+0+0+0=12).