title: A comparison of the implant stability among various implant systems: clinical study.
abstract: OBJECTIVE
  To determine the change in stability of single-stage, three different design of implant systems in humans utilizing resonance frequency analysis for early healing period (24 weeks), without loading.
  
  
  METHODS
  Twenty-five patients were included into this study. A total of 45 implants, three different design of implant systems (group A,C,R) were placed in the posterior maxilla or mandible. The specific transducer for each implant system was used. ISQ (implant stability quotient) reading were obtained for each implant at the time of surgery, 3, 6, 8, 10, 12, 24 weeks postoperatively. Data were analyzed for different implant type, bone type, healing time, anatomical locations.
  
  
  RESULTS
  For each implant system, a two-factor mixed-model ANOVA demonstrated that a significant effect on ISQ values (group A = 0.0022, C = 0.017, R = 0.0018). For each implant system, in a two-factor mixed model ANOVA, and two-sample t-test, the main effect of jaw position (P > .005) on ISQ values were not significant.
  
  
  CONCLUSIONS
  All the implant groups A, C and R, the change patterns of ISQ over time differed by bone type. Implant stability increased greatly between week 0 and week six and showed slow increase between week six and six months (plateau effect).
authors.affiliation: Graduate Student, Department of Esthetic Restorative Dentistry, Korea University, Korea.
authors.forename: Jae-Min
authors.initials: JM
authors.lastname: Kim
authors.forename: Sun-Jong
authors.initials: SJ
authors.lastname: Kim
authors.forename: Inho
authors.initials: I
authors.lastname: Han
authors.forename: Sang-Wan
authors.initials: SW
authors.lastname: Shin
authors.forename: Jae-Jun
authors.initials: JJ
authors.lastname: Ryu