| 摘要 |
A cover (2) fixed to the base (1) covers the base and the holder (3,4). The edge of the cover is shaped to match the outline of the base, without corners or edges. The cover is closed apart from two openings (10). The transition between the cover's outer surface and the surface of the tooth is smooth. The holder as at east one recording aid (7) for optical measurement. The holder has at least one hook (8) movable over the base's outline.
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