Fig. 3
From: Impact of posterior occlusal contact loss on cardiovascular disease using a Japanese claims database
Categorization of dental occlusal support according to the Eichner classification, based on the presence and location of remaining teeth. Class A includes individuals with full support zones: A1 indicates complete contact across all areas, A2 indicates missing teeth in either the upper or lower arch, and A3 indicates missing teeth in both arches while maintaining posterior support. Class B includes individuals with partial occlusal support zones; B1 indicates three support zones, B2 indicates two support zones, B3 indicates only one support zone, and B4 indicates absence of opposing molar support and occlusal contacts limited to the front teeth. Class C includes individuals with the absence of functional occlusal support: C1 indicates teeth in both arches but without occlusal contact, C2 indicates teeth in only one arch, and C3 indicates complete edentulism, with no teeth in either arch.
