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Mostly the dentist prepares the support dies tangentionally.
You can use a conometer which has a certain amount of “room to move” between 0° and 12°.
The highest adhesion is achieved with an angle of 2°. If the conical angle is higher than 6° the pressed fit gets lost.
From an aesthetic point of view, the laboratory technique starts in a similar fashion to the telescopic technique starting with surveying in the anterior area.
Surveying with a wax-scraper 2° shows a disadvantageous path of insertion of premolar 25.
In order to decrease the undercut in the distal area, you can work with instruments calibrated to an angle of 6°.
All conical crowns are surveyed with a 6° angle.