Method and apparatus for drilling bores in jaw bone tissue for the reception of dental anchors

Claim 1

A method of drilling a bore of predetermined depth in a jaw bone of patient so that a dental anchor can be installed therein, said method comprising the steps of advancing a hollow head of a trephine drill longitudinally into the jaw bone to form a bore having a center core, said advancing step being continued relative to a stop member which is loosely mounted on a shank portion of said drill so as to be freely longitudinally slidable thereon until said stop member becomes sandwiched between the jaw bone and a surface movable with a motor housing carrying said drill, said shank portion being of smaller diameter than said drill head and extending from said drill head to a chuck portion of said motor housing, said stop member having an outer diameter greater than an outer diameter of said drill head and having a longitudinal length of such dimension that when said length is subtracted from a longitudinal distance between a front end of said drill head and said surface movable with said motor housing, the remainder equals said predetermined depth.

Claim 2

A method of drilling a bore of predetermined depth in a jaw bone of patient so that a dental anchor can be installed therein, said method comprising the steps of advancing a hollow head of a trephine drill longitudinally into the jaw bone to form a bore having a center core, said advancing step being continued relative to a stop member which is loosely mounted on a shank portion of said drill so as to be freely longitudinally slidable thereon until said stop member becomes sandwiched between the jaw bone and a surface movable with a motor housing carrying said drill, said shank portion being of smaller diameter than said drill head and extending from said drill head to a chuck portion of said motor housing, said stop member having an outer diameter greater than an outer diameter of said drill head and having a longitudinal length of such dimension that when said length is subtracted from a longitudinal distance between a front end of said drill head and said surface movable with said motor housing, the remainder equals said predetermined depth.

Claim 3

A method of drilling a bore of a predetermined depth in a jaw bone of a patient so that a dental anchor can be installed therein, said method comprising the steps of: drilling a longitudinally extending pilot hole in the bone, installing in said pilot hole a bushing comprising first and second cylindrical portions arranged end-to-end, said first cylindrical portion being inserted into said pilot hole such that said second cylindrical portion bears against the bone, inserting a hollow head of a trephine drill in telescoping fashion over said second cylindrical portion such that said second cylindrical portion restrains said drill against sideways motion, advancing said drill head longitudinally into the jaw bone until an abutment shoulder of said drill abuts an end of said second cylindrical portion to form a bore of a desired first depth, which is less than said predetermined depth, said bore containing a first core portion, removing said drill from said bore, breaking off and removing said first core portion, and reinserting said drill head into said bore and advancing said drill head longitudinally to extend the depth of said bore while forming a second core portion therein, said advancing step being continued relative to a stop member which is freely longitudinally slidably situated on said drill until said stop member becomes sandwiched between the jaw bone and a surface movable with a motor housing carrying said drill, said stop member having an outer diameter greater than an outer diameter of said drill head, and having a longitudinal length of such dimension that when said length is subtracted from a longitudinal distance between a front end of said drill head and said surface movable with said motor housing, the remainder equals said predetermined depth.

Claim 4

A method of drilling a bore of a predetermined depth in a jaw bone of a patient so that a dental anchor can be installed therein, said method comprising the steps of: drilling a longitudinally extending pilot hole in the bone, installing in said pilot hole a bushing comprising first and second cylindrical portions arranged end-to-end, said first cylindrical portion being inserted into said pilot hole such that said second cylindrical portion bears against the bone, inserting a hollow head of a trephine drill in telescoping fashion over said second cylindrical portion such that said second cylindrical portion restrains said drill against sideways motion, advancing said drill head longitudinally into the jaw bone until an abutment shoulder of said drill abuts an end of said second cylindrical portion to form a bore of a desired first depth, which is less than said predetermined depth, said bore containing a first core portion, removing said drill from said bore, breaking off and removing said first core portion, and reinserting said drill head into said bore and advancing said drill head longitudinally to extend the depth of said bore while forming a second core portion therein, said advancing step being continued relative to a stop member which is freely longitudinally slidably situated on said drill until said stop member becomes sandwiched between the jaw bone and a surface movable with a motor housing carrying said drill, said stop member having an outer diameter greater than an outer diameter of said drill head, and having a longitudinal length of such dimension that when said length is subtracted from a longitudinal distance between a front end of said drill head and said surface movable with said motor housing, the remainder equals said predetermined depth.

Claim 6

A method of drilling a bore of predetermined depth in a jaw bone of a patient so that a dental anchor can be installed therein, said method comprising the steps of: drilling a longitudinally extending pilot hole in the bone, installing in said pilot hole a bushing comprising first and second cylindrical portions arranged end-to-end, said first cylindrical portion being inserted into said pilot hole such that said second cylindrical portion bears against the bone, inserting a hollow head of a trephine drill in telescoping fashion over said second cylindrical portion such that said second cylindrical portion restrains said drill against sideways motion, advancing said drill head longitudinally into the jaw bone until an abutment shoulder of said drill abuts an end of said second cylindrical portion to form a bore of a desired first depth, which is less than said predetermined depth, said bore containing a first core portion, removing said drill from said bore, breaking off and removing said first core position, and reinserting said drill head into said bore and' advancing said drill head longitudinally to extend the depth of said bore while forming a second core portion therein.

Claim 7

A method of drilling a bore of predetermined depth in a jaw bone of a patient so that a dental anchor can be installed therein, said method comprising the steps of: drilling a longitudinally extending pilot hole in the bone, installing in said pilot hole a bushing comprising first and second cylindrical portions arranged end-to-end, said first cylindrical portion being inserted into said pilot hole such that said second cylindrical portion bears against the bone, inserting a hollow head of a trephine drill in telescoping fashion over said second cylindrical portion such that said second cylindrical portion restrains said drill against sideways motion, advancing said drill head longitudinally into the jaw bone until an abutment shoulder of said drill abuts an end of said second cylindrical portion to form a bore of a desired first depth, which is less than said predetermined depth, said bore containing a first core portion, removing said drill from said bore, breaking off and removing said first core position, and reinserting said drill head into said bore and' advancing said drill head longitudinally to extend the depth of said bore while forming a second core portion therein.