title: Changes in prosthetic screw stability because of misfit of implant-supported prostheses.
abstract: OBJECTIVE
  The effect of two levels of prosthesis misfit on prosthetic screw stability was evaluated.
  
  
  METHODS
  Two levels of vertical discrepancies--100 and 175 microns--were introduced between an implant-supported complete denture and the terminal abutment. An implant-supported complete denture without vertical discrepancy served as a control. Cyclic load was delivered vertically on the cantilever portion of the prosthesis next to the terminal abutment for 48 hours for each trial. A total of seven sets of new screws were tested for each level of fit.
  
  
  RESULTS
  The results revealed significant prosthetic screw instability at both the 100- and 175-micron levels of discrepancy.
  
  
  CONCLUSIONS
  Vertical discrepancies of 100 and 175 microns introduced between an implant-supported fixed complete denture and the terminal abutment resulted in significant prosthetic screw instability.
authors.forename: Lulwa Ebrahim E
authors.initials: LE
authors.lastname: al-Turki
authors.forename: John
authors.initials: J
authors.lastname: Chai
authors.forename: Eugene P
authors.initials: EP
authors.lastname: Lautenschlager
authors.forename: Mark C
authors.initials: MC
authors.lastname: Hutten
mesh_terms: D000704:Analysis of Variance; D000044:Dental Abutments; D017268:Dental Prosthesis Retention / Q000295:instrumentation*; D019094:Dental Prosthesis, Implant-Supported; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D006801:Humans; D017755:Prosthesis Fitting; D018709:Statistics, Nonparametric; D013314:Stress, Mechanical; D019415:Torque