title: In vitro wear of different material combinations of intracoronal precision attachments.
abstract: 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.
authors.affiliation: Department of Prosthodontics, Friedrich Alexander University Erlangen-Nuremberg, Erlangen, Germany. sholst@prothetik-erlangen.de
authors.forename: Stefan
authors.initials: S
authors.lastname: Holst
authors.forename: Markus B
authors.initials: MB
authors.lastname: Blatz
authors.forename: Stephan
authors.initials: S
authors.lastname: Eitner
authors.forename: Mandred
authors.initials: M
authors.lastname: Wichmann
mesh_terms: 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
chemical_list: D003722:Dental Alloys; D006047:Gold Alloys; D012834:Silver; D007495:Iridium; D010984:Platinum; D014025:Titanium