3.7 mm Interchangable Osteotome Concave Tip, Straight 3.7 mm Interchangable Osteotome Concave Tip, Straight OSTMSH37 3.7 mm Osteotome used to carry and place bone grafting material into site of the elevated sinus floor. 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.