Studies on the accuracy of fit of non-precious metal posts and cores
Herzog, M.; Czirjak, K.
Deutsche Zahnarztliche Zeitschrift 45(5): 260-263
1990
ISSN/ISBN: 0012-1029 PMID: 2269102 Document Number: 353107
When cemented, directly and indirectly fabricated posts and cores should have good retentive properties and passive fit. Both features require adequate accuracy of fit. The results published in this paper demonstrate that, when using the NPM alloy Dentitan, this is requirement is met only by the direct fabrication method. Without subsequent fine adaptation the mean width of the marginal openings was 87 microns as against 248 microns in indirectly fabricated posts. The interactions in the area of the real interfaces between stump and posts and their effects on the cervical margin are discussed.