Intra-oral metals may be sampled very conveniently with the ordinary white 'alpine' stones, which are normally used to finish composites etc. 

• At high speed for example in an airotor, but without any water cooling, the metal is just touched with the instrument. Also somewhat sub-gingival margins may be reached in this way.
• It is important to understand that each sample requires a new alpine stone, which should never touch nor have ever touched any other metal than the sample.
• By its shaft, the alpine stone with the small remnants of the metal is taped to a paper with the tooth number and perhaps other identification information on it.
  Clear identification is extra important when more samples (more stones) are sent in.
• The samples are sent in.

The compositions of the samples are established with EDAX within approximately 1 wt%, which prevents the detection of Beryllium (too light atoms) and impurities less than 1wt%.

tel: +31 20 5188335
fax: +31 20 6692726
e-mail: a.feilzer@acta.nl