Patent ID: 8794963

Claim:
Centering and guiding device, comprising: at least one drill bit ( 5 ) having a proximal end ( 5 a ) and a free distal end ( 5 b ) with a proximal section ( 50 a ) for connection to the dental handpiece ( 6 ) and a distal cutting section ( 50 b ), a tubular guide sleeve ( 4 ) adapted to be engaged with a small clearance in a tubular drilling bush ( 2 ) of a surgical guide ( 1 ) used while drilling a hole for an implant ( 29 ) in the jaw ( 30 ) of a patient, support means ( 3 ) holding the tubular guide sleeve ( 4 ) permanently coaxial with and slidable relative to said at least one drill bit ( 5 ), and adapted to cause engagement of the tubular guide sleeve ( 4 ) in the tubular drilling bush ( 2 ) at the latest as soon as said at least one drill bit ( 5 ) begins to drill the jaw ( 30 ) of the patient, wherein the support means ( 3 ) include a smooth cylindrical intermediate section ( 5 c) of said at least one drill bit ( 5 ) with an outside diameter (d 3 ) substantially equal to or slightly less than an inside diameter (d 4 ) of the tubular guide sleeve ( 4 ) and on which the tubular guide sleeve ( 4 ) is slidably engaged, and wherein the tubular guide sleeve ( 4 ) includes friction means ( 9 ) to slide frictionally, exclusively on said smooth cylindrical intermediate section ( 5 c ), in a direction of the proximal end ( 5 a ) of said at least one drill bit ( 5 ), and wherein the friction means comprises means for producing a reaction force that opposes an axial force applied by a practitioner during penetration of the drill bit into the jaw of the patient.