A rotary osteotome configured to be turned continuously at high speed in a burnishing direction to enlarge an osteotomy, comprising: a shank establishing a longitudinal axis of rotation for said rotary osteotome, a body extending from said shank, said body having an apical end remote from said shank and a conically tapered profile decreasing from a maximum diameter adjacent said shank to a minimum diameter adjacent said apical end, a plurality of helically spiraling flutes disposed about said body, a plurality of lands, each said land formed between adjacent flutes, each said land having a working edge helically twisting about said body in a direction that turns away from the burnishing direction as said conically tapered profile decreases in diameter, said working edges configured to radially displace surrounding bone material through compaction when said osteotome is pushed into an osteotomy while being rotated in the high-speed burnishing direction, characterized by said apical end of said body including at least one grinding lip extending radially from adjacent said longitudinal axis to one of said working edges, a radially outer portion of said grinding lip configured to grind bone material as said body advances into the osteotomy in the high-speed burnishing direction, said grinding lip having a generally planar first trailing flank, said first trailing flank being canted from said grinding lip at a first angle, and a generally planar second trailing flank falling away from said first trailing flank at a second angle smaller than said first angle, a plurality of said flutes opening directly into said second trailing flank to receive and then upwardly channel bone debris produced by said grinding lip as said apical end is pushed at high-speed rotation into the osteotomy, said working edges further configured to auto-graft the bone debris channeled upwardly through said flutes for repatriation into the surrounding bone material. a shank establishing a longitudinal axis of rotation for said rotary osteotome, a body extending from said shank, said body having an apical end remote from said shank and a conically tapered profile decreasing from a maximum diameter adjacent said shank to a minimum diameter adjacent said apical end, a plurality of helically spiraling flutes disposed about said body, a plurality of lands, each said land formed between adjacent flutes, each said land having a working edge helically twisting about said body in a direction that turns away from the burnishing direction as said conically tapered profile decreases in diameter, said working edges configured to radially displace surrounding bone material through compaction when said osteotome is pushed into an osteotomy while being rotated in the high-speed burnishing direction, characterized by said apical end of said body including at least one grinding lip extending radially from adjacent said longitudinal axis to one of said working edges, a radially outer portion of said grinding lip configured to grind bone material as said body advances into the osteotomy in the high-speed burnishing direction, said grinding lip having a generally planar first trailing flank, said first trailing flank being canted from said grinding lip at a first angle, and a generally planar second trailing flank falling away from said first trailing flank at a second angle smaller than said first angle, a plurality of said flutes opening directly into said second trailing flank to receive and then upwardly channel bone debris produced by said grinding lip as said apical end is pushed at high-speed rotation into the osteotomy, said working edges further configured to auto-graft the bone debris channeled upwardly through said flutes for repatriation into the surrounding bone material.