Kennedy Classification

Classification of the Partially Edentulous Arch

Kennedy class I: bilateral edentulous area (with or without gaps in the anterior region).

Kennedy class II: one-sided edentulous area (with or without gaps in the anterior area).

Kennedy Class III: A unilateral edentulous area with natural teeth both anterior and posterior to the area.

Kennedy class IV:  Edentulous area located to the anterior of the remaining natural teeth.

Wisdom teeth are not included! and Modifications

( Mod 1: plus one gap, Mod 2: plus several gaps, Mod 3: remaining teeth) 

Above approx. 6 gaps = remaining teeth=Mod 3

References

Kennedy E: partial denture design, Brooklyn, NY, 1928, Dental Items of Internest.