title: Influence of the lubricant and the alloy on the wear behaviour of attachments.
abstract: OBJECTIVE
  Wear of attachments leads to a loss of retention and reduces the function of overdentures. This study evaluated the retention force changes of an attachment system for overdentures. The influence of the lubricant and the alloy on wear constancy was examined.
  
  
  METHODS
  Cylindrical anchors of the Dalbo(®) -Z system were tested (Cendres+Métaux SA). Three groups of alloy-lubricant combinations were generated 1.Elitor(®) /NaCl-solution (EN) 2.Elitor(®) /Glandosane(®) aquadest. (EG) and 3.Valor(®) /Glandosane(®) /aquadest. (VG). Ten samples of each group were subjected to 10 000 insertion-separation cycles.
  
  
  RESULTS
  For the EN-group, this led to a large increase in retention force. The EG- and VG-group showed a constant decrease after an initial increase in retention force at the beginning of the wear simulation. The change of the alloy caused no statistically significant differences. The use of a more viscous lubricant reduced the retention force increase significantly.
  
  
  CONCLUSIONS
  The use of a lubricant which simulates clinical conditions is an absolute need for wear simulation because the retention force changes are influenced enormously. The change of the alloy at the Dalbo(®) -Z system did not influence the wear behaviour. As a slight decrease in retention force was recorded, it is useful for an attachment system to allow compensation with an adjustable matrix.
authors.affiliation: Department of Prosthodontics, Preclinical Education and Dental Materials Science, University of Bonn, Bonn, Germany. sbayer@uni-bonn.de
authors.forename: Stefan
authors.initials: S
authors.lastname: Bayer
authors.forename: Ludger
authors.initials: L
authors.lastname: Keilig
authors.forename: Dominik
authors.initials: D
authors.lastname: Kraus
authors.forename: Manfred
authors.initials: M
authors.lastname: Grüner
authors.forename: Helmut
authors.initials: H
authors.lastname: Stark
authors.forename: Sebastian
authors.initials: S
authors.lastname: Mues
authors.forename: Norbert
authors.initials: N
authors.lastname: Enkling
mesh_terms: D002266:Carboxymethylcellulose Sodium / Q000737:chemistry; D003722:Dental Alloys / Q000737:chemistry*; D019554:Dental Restoration Wear; D003799:Dental Stress Analysis / Q000295:instrumentation; D003781:Denture Retention / Q000295:instrumentation*; D003828:Denture, Overlay; D006047:Gold Alloys / Q000737:chemistry; D006801:Humans; D054327:Lubricants / Q000737:chemistry*; D008422:Materials Testing; D010984:Platinum / Q000737:chemistry; D012464:Saliva, Artificial / Q000737:chemistry; D012834:Silver / Q000737:chemistry; D012965:Sodium Chloride / Q000737:chemistry; D013012:Sorbitol / Q000737:chemistry; D013314:Stress, Mechanical; D014025:Titanium / Q000737:chemistry; D014783:Viscosity
chemical_list: D003722:Dental Alloys; D006047:Gold Alloys; D054327:Lubricants; D012464:Saliva, Artificial; D012834:Silver; D012965:Sodium Chloride; D010984:Platinum; D013012:Sorbitol; D014025:Titanium; D002266:Carboxymethylcellulose Sodium