title: Stability changes of miniscrew implants over time.
abstract: OBJECTIVE
  To quantify in vivo changes in miniscrew implant (MSI) stability over time using resonance frequency analysis, and to determine if pilot holes and placement sites affect changes in MSI stability.
  
  
  METHODS
  Twenty-two self-tapping MSIs (1.6 mm wide and 9 mm long) were placed in the maxillae of 2 adult beagle dogs (20 months old). The Osstell Mentor was used to measure the implant stability quotient (ISQ) weekly for 8 weeks. A split-mouth design was used to evaluate the effects of 1.1-mm wide, 3-mm deep pilot holes.
  
  
  RESULTS
  The MSIs that failed showed significantly (P < .05) greater decreases in ISQ values during the first 3 weeks than the MSIs that remained stable. All of the MSIs that failed (41%) had been placed in nonkeratinized tissue. MSIs that remained stable throughout the study also showed significant decreases in ISQ values during the first 3 weeks, followed by increases during the fourth and fifth weeks. Changes in ISQ values of MSIs inserted into bone with and without pilot holes were comparable (P > .05).
  
  
  CONCLUSIONS
  Stability of unloaded MSIs decreased during the first 3 weeks and increased thereafter. Although the effects of pilot holes on stability could not be confirmed, placement of MSIs into nonkeratinized tissue negatively affected their stability and increased the likelihood of failures.
authors: Orthodontic Department, Saint Louis University, Missouri, USA.
authors: Derid S
authors: DS
authors: Ure
authors: Donald R
authors: DR
authors: Oliver
authors: Ki Beom
authors: KB
authors: Kim
authors: Ana Cláudia
authors: AC
authors: Melo
authors: Peter H
authors: PH
authors: Buschang
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