title: In Vitro Cyclic Dislodging Test on Retentive Force of Two Types of Female Parts of SFI-Bar.
abstract: OBJECTIVE
  This study aimed to compare the difference in mechanical behavior between two types of female-part clips of the Stress-Free Implant Bar (SFI-Bar) system during simulation of insertion-removal cycles.
  
  
  METHODS
  A total of 10 samples simulating SFI-Bar-attachment-retained implant overdentures were fabricated and randomly divided into two groups (n = 5). One group used E-clips (Elitor alloy) as the female part of the SFI-Bar, and the other used T-clips (all titanium grade IV with red nylon inserts). A total of 14,000 insertion-removal cycles were carried out on each sample. Retentive forces from each cycle were recorded for analysis.
  
  
  RESULTS
  Significant differences were found between the two groups (P < .05).
  
  
  CONCLUSIONS
  The retentive force of E-clips increased as the number of dislodging cycles increased, suggesting that some adjustment may be needed to lower this part's retentive force. T-clips with changeable nylon inserts were deformed after about 4,200 insertion-removal cycles, which interfered with insertion. This indicated that T-clips may need replacement after 2 to 3 years of clinical use.
authors.forename: Ling
authors.initials: L
authors.lastname: Wei
authors.forename: Qinwei
authors.initials: Q
authors.lastname: Ma
authors.forename: Xiaotong
authors.initials: X
authors.lastname: Qin
authors.forename: Shaoxia
authors.initials: S
authors.lastname: Pan
mesh_terms: D003722:Dental Alloys / Q000737:chemistry; D003764:Dental Materials / Q000737:chemistry; D019094:Dental Prosthesis, Implant-Supported / Q000295:instrumentation*; D003779:Denture Design; D003781:Denture Retention / Q000295:instrumentation*; D003828:Denture, Overlay; D006801:Humans; D008422:Materials Testing; D009757:Nylons / Q000737:chemistry; D011897:Random Allocation; D013314:Stress, Mechanical; D013997:Time Factors; D014025:Titanium / Q000737:chemistry
chemical_list: D003722:Dental Alloys; D003764:Dental Materials; D009757:Nylons; D014025:Titanium