Die Übertragungsgenauigkeit von okklusalen Verhältnissen in den ...

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Die Übertragungsgenauigkeit von okklusalen Verhältnissen in den ...

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The moulds of both the jaws were made with the corrective impression

technique and the double-mix technique with casting with a superhard plaster.

The accuracy of reproduction of the bite impressions used was tested after a

storage period of at least 24 hours. Here greater inaccuracies appeared than

under purely technical laboratory conditions in all ten of the tested impressions

made of Kristall ® , Memosil C.D. ® “new” and in particular also in those made of

Futar D ® – with which in itself good properties are to be expected. Somewhat

smaller but surprisingly insignificant variations arose with the impressions made

of Futar D ® in the test on jaw models with the corrective impression technique

than with the impressions made of Memosil C.D. ® “new” and Kristall ® . Of the

impressions tested on jaw models with the double-mix technique, however, the

impressions made of Memosil C.D. ® “new” actually stood out with their smaller

inaccuracies than those made of Futar D ® . The impressions made of Kristall ® ,

on the other hand, showed greater errors here too. An additional test with the

cut impressions made of Futar D ® found no improvement in accuracy of

reproduction.

In conclusion it can be said that with hard registration materials such as Futar

D ® , of which very good properties may be expected, greater errors may occur

with plaster models than with impressions of an average consistency. On the

other hand, with soft impressions such as Kristall ® , the error is great, as is

expected. The moulding technique used for the production of the models plays

scarcely any part here.

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