13. The opening and closing movements make it possible
to check in the mouth and see whether the tip of the arrow
snaps into the hole of the Plexiglas roundel (Fig. 3).
Fig. 3
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14. If this is the case, the position is cemented using regis-
tration silicone or impression plaster.
15. If this is not the case, the registration procedure must
be repeated.
EN
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