Dentistry – Apparatus – Tool bit
Patent
1988-03-24
1991-02-05
Swiatek, Robert P.
Dentistry
Apparatus
Tool bit
433102, A61C 302
Patent
active
049900889
ABSTRACT:
There is provided a combination dental tool for boring and grinding undercut bore holes in teeth. The tool includes a boring end portion tapering longitudinally endwardly to a minimum effective diameter at the tip and providing an axially facing cutting surface for drilling a bore into a tooth upon rotation of the tool. A shank portion extending axially from the drilling end portion includes at least two successive longitudinally extending sections, the first section having laterally facing cutting surfaces and a relatively larger effective diameter, and the second section, immediately adjacent the first section, having a relatively smaller diameter. Using this tool, an axially directed force forms the bore hole, and a laterally directed force exerted on the tool within a previously drilled bore hole, routs out an undercut portion in the internal surface of the bore.
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patent: 4758156 (1988-07-01), Johnson
Amaral, Jr. Anthony
Lucchesi Nicholas D.
Magidoff Barry G.
Sutton Paul J.
Swiatek Robert P.
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