4.2 mm Interchangable Osteotome Concave Tip, Straight 4.2 mm Interchangable Osteotome Concave Tip, Straight OSTMSH42 4.2 mm Osteotome used to carry and place bone grafting material into site of the elevated sinus floor. Where to Buy x Category - Any - Dealer Partners Sales Representative Strategic Markets Schools Representative Accutronâ„¢ Equipment Sales Zip Code Find Representative Reset No results found. Please try a different search or explore: Sales Representatives | Dealer Partners | Strategic Markets | Schools | Accutron