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Stability changes of miniscrew implants over time.

Derid S Ure1, Donald R Oliver, Ki Beom Kim

  • 1Orthodontic Department, Saint Louis University, Missouri, USA.

The Angle Orthodontist
|May 27, 2011
PubMed
Summary
This summary is machine-generated.

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Miniscrew implant (MSI) stability initially decreases then increases over time. Placement in nonkeratinized tissue negatively impacts MSI stability, increasing failure risk, while pilot holes showed no significant effect.

Area of Science:

  • Orthodontics
  • Dental Implantology
  • Biomaterials Science

Background:

  • Miniscrew implants (MSIs) are crucial for orthodontic anchorage.
  • Assessing MSI stability in vivo is essential for treatment success.
  • Understanding factors influencing MSI stability, such as placement site and preparation, is key.

Purpose of the Study:

  • To quantify in vivo changes in miniscrew implant (MSI) stability over time using resonance frequency analysis.
  • To determine if pilot holes and placement sites affect changes in MSI stability.

Main Methods:

  • Twenty-two self-tapping MSIs were placed in beagle dog maxillae.
  • Implant Stability Quotient (ISQ) was measured weekly for 8 weeks using resonance frequency analysis (Osstell Mentor).
  • A split-mouth design evaluated the effects of pilot holes and placement in keratinized versus nonkeratinized tissue.

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Main Results:

  • MSIs that failed (41%) showed greater ISQ decreases in the first 3 weeks and were placed in nonkeratinized tissue.
  • Stable MSIs exhibited initial ISQ decreases followed by increases from week 4 onwards.
  • Pilot holes did not significantly affect MSI stability changes (P > .05).

Conclusions:

  • Unloaded MSIs demonstrate a biphasic stability pattern: initial decrease followed by recovery and increase.
  • Placement in nonkeratinized tissue is associated with reduced MSI stability and higher failure rates.
  • The influence of pilot holes on MSI stability requires further investigation.