| 摘要 |
PROBLEM TO BE SOLVED: To provide sufficient consideration for particularity of the using place in using a bone drill so far installed on a dental contra-angle hand piece in a mouth. SOLUTION: A drill projects from a cover tip only at bone cutting time by covering this cover over both a dental contra-angle hand piece and a bone drill installed on the hand piece, and is separated from a bone surface, and is stored in the cover. Thus, sufficient consideration is required as usual, safety is enhanced, and unexpected damage to a peripheral hard/soft tissues can be prevented.
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