In vitro wear of different material combinations of intracoronal precision attachments.
OBJECTIVE
This study examined the retentive forces of intracoronal precision attachments after wear cycling.


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.


CONCLUSIONS
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.
Holst
Stefan
S
Department of Prosthodontics, Friedrich Alexander University Erlangen-Nuremberg, Erlangen, Germany. sholst@prothetik-erlangen.de
Blatz
Markus B
MB
Eitner
Stephan
S
Wichmann
Mandred
M
D003722:Dental Alloys / Q000737:chemistry*; D019554:Dental Restoration Wear; D003834:Denture Precision Attachment; D003781:Denture Retention; D017276:Friction; D006047:Gold Alloys / Q000737:chemistry; D006801:Humans; D007495:Iridium / Q000737:chemistry; D008422:Materials Testing; D010984:Platinum / Q000737:chemistry; D012834:Silver / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry
D003722:Dental Alloys; D006047:Gold Alloys; D012834:Silver; D007495:Iridium; D010984:Platinum; D014025:Titanium