| 摘要 |
Each hard metal instrument in the dental-care set has a shaft (5) clamped into a drive mechanism, and has a spherical head possessing blades. A first instrument (1) has a head (2) with eight to sixteen, preferably twelve twisted blades and a transverse cut. A second instrument (3) has a head (4) with between sixteen and twenty-four, preferably twenty, twisted blades.
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