Edentulous Ridge Chisel (#36 Gold Foil Knife) Edentulous Ridge Chisel (#36 Gold Foil Knife) GF36 The Edentulous Ridge Chisel initiates splitting extremely narrow bone ridges when a bur is not recommended with a 4.8mm bi-beveled working end. Where to Buy x Category Dealer PartnersSales RepresentativeStrategic MarketsSchools RepresentativeAccutron™ Equipment Sales Zip Code Find RepresentativeReset Select a category, input a zip code and click on Find Representative, or explore the complete list here.