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What is Example of excavator are all except: and explain in detail?
The four subdivisions of excavators are

Ordinary hatchets
Hoes
Angle formers
Spoons

Chisels are intended primarily for cutting enamel and may be grouped as

Straight, slightly curved, or bin-angle
Enamel hatchets
Gingival margin trimmers

Sturdevants operative dentistry 7th edition page e4