metal dental restoration material / how to relate to metal ion

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A comment asks: 
Use CHEBI:33521 'metal ion' in a complete definition. Fixure out how to say 
"mostly" first, however

The first step would be to assert
has_grain (see OBI) some metal ion

If we wanted to assert something like mostly then we might use something like 
concentration with a threshold. However I think 80% of what we want to 
accomplish would be to use has_grain.

If we want to include more material information we can add has_grain statements 
elsewhere
For porcelain we can add quartz CHEBI:46727 and feldspar CHEBI:48733
(http://www.dentallearning.org/course/Ceramics/Dental_Ceramics.pdf)
(http://www.ncbi.nlm.nih.gov/mesh/?term=dental+porcelain)

Other observations
According to the definitions, gold foil dental restoration material is_a high 
noble metal dental restoration material
predominately base metal dental restoration material UNION noble metal dental 
restoration material = metal dental restoration material
stainless steel dental restoration material is_a predominately base metal 
dental restoration material
titanium dental restoration material is_a predominately base metal dental 
restoration material
amalgam dental restoration material is_a predominately base metal dental 
restoration material  

typo matalic -> mettalic

Original issue reported on code.google.com by alanruttenberg@gmail.com on 20 Dec 2014 at 8:04

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Upon closer examination, use has_part with feldspar as that term in chebi is a 
chemical substance rather and an molecule/ion. 

Original comment by alanruttenberg@gmail.com on 21 Dec 2014 at 1:18

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 not quite clear to me, but probably doesn't matter.

Original comment by titus.sc...@gmail.com on 7 Jan 2015 at 1:49