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In vitro wear of different material combinations of intracoronal precision attachments
Stefan Holst1, Markus B Blatz, Stephan Eitner
1Department of Prosthodontics, Friedrich Alexander University Erlangen-Nuremberg, Erlangen, Germany. sholst@prothetik-erlangen.de
Purpose:
This study examined the retentive forces of intracoronal precision attachments after wear cycling.
Materials And Methods:
Three material combinations of an intracoronal cylindric T-attachment were tested. A total of 10,000 separating and joining movements were performed, and retentive forces were measured.
Results:
Components made of gold alloy performed significantly better (P = .002) than other materials. The average proportional loss of retention was 90% for titanium and 47% for gold alloy components.
Conclusion:
Cyclic loading of metal precision attachment components results in loss of retention, which can be fully compensated by reactivating internal screws in the patrices. Machined, high-noble gold alloys show less wear than other materials.
