First classification which give importance to support of partial dentures by remaining tissues. Bailyn used letters like A& P.
A–anterior restorations,where there are saddle areas antr to the 1st bicuspid (premolar)
P-posterior restoration, where there are saddle areas posterior to the canine.
Further they are subclassified as follows:
- class 1: bounded saddle(not more than 3 teeth missing)
- Class 2:free end saddle(there is no distal abutment tooth)
- Class 3:bounded saddle(more than 3 teeth missing)