A pilot bore is cut into bone tissue; a post is fixed in the bore, and an elongate
enlarged region is formed at the top end of the bore using a tubular cutter which
is guided on the post. The elongate enlarged region can be accurately cut even
with a hand drill due to the guidance provided by the post. The cutter may have
holes or channels for circulation of cooling/lubricating liquid, and a swarf-removing
slot may be provided. When the technique is used in dentistry for replacement of
a tooth crown, a tubular support element is fixed around the post in the bore enlargement.
