**Polyoxymethylene, also known as acetal, polyacetal, and polyformaldehyde***, is an engineering thermoplastic used in precision parts requiring high stiffness, low friction, and excellent dimensional stability.

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Note added at 1 hr (2019-10-28 22:32:32 GMT)
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https://astrup.no › content › version › file › Des_Kap_12
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84. Plate, ekstrudert, sort. 84. Rundbolt, ekstrudert, hvit 85. Rundbolt, ekstrudert, sort 86. Emnerør, ekstrudert. 88. POM polyoksymetylen = acetal. 1. 2. 3. 4. 5. 6. 7.

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Note added at 1 hr (2019-10-28 22:36:14 GMT)
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https://www.shutterstock.com/nb/search/partial denture

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Note added at 2 hrs (2019-10-28 22:40:00 GMT)
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see "metal frame"
http://dentalstoep-import.no/bilder/ordreseddel.pdf

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Note added at 2 hrs (2019-10-28 22:40:56 GMT)
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frame = skjelett

??

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Note added at 2 hrs (2019-10-28 22:46:46 GMT)
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Helproteser og delproteser — Kreativ Dental®
https://kreativdentalclinic.eu › behandling › hel-og-delp...
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Delprotese - partial protese (partial denture). Hvis du fortsatt har dine egne fortenner i behold og f.eks mangler jekslene, kan en løsning være en delprotese for å ...

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Note added at 2 hrs (2019-10-28 22:55:31 GMT)
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Hi, perhaps "delprotese" = denture frame

see:

https://www.google.com/search?q=delprotese bilder&sxsrf=ACYB...

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Note added at 2 hrs (2019-10-28 22:57:43 GMT)
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also found

metal**skeletafen** [frame??] aftagelig delprotese

hope this gives you a few clues

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Note added at 2 hrs (2019-10-28 23:00:38 GMT)
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lastly:

dintannlegegdansk.com › smile_price
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Protetik. Helprotese i akryl tannløshet, 1650 PLN. Delprotese i akryl, 1150 PLN. Helprotese laget av acetal, 2150 PLN. dintannlegegdansk.com › smile_price
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Protetik. Helprotese i akryl tannløshet, 1650 PLN. Delprotese i akryl, 1150 PLN. Helprotese laget av acetal, 2150 PLN. Skjelettppotese laget av acetal, 2350 PLN. 2350 PLN.