shutter: a mechanical device that limits the passage of light; especially : a camera component that allows light to enter by opening and closing an aperture
obturator: one (as a prosthetic device) that closes or blocks up an opening (as a fissure in the palate) But of course I'm not sure, not a native speaker.
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In my remarks in the translation to finnish I mentioned also the word shutter in finnish, but chose to translate with the word for obturator. The same choice has been made I think in danish too. As always, without context, cannot be sure.