Pederson’s Scale

ClassificationValue
Spatial relationship 
Mesio-angular1
Horizontal/transvers2
Vertical3
Disto-angular4
Depth 
Level A: high occlusal level1
Level B: medium occlusal level2
Level C: deep occlusal level3
Ramus relationship/space available 
Class 1: sufficient space1
Class 2: reduced space2
Class 3: no space3
Difficulty index 
Very difficult7-10
Moderately difficult5-6
Slightly difficult3-4
0
0