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Microcomputed Tomographic and Biomechanical Analysis of Orthodontic Microscrew Stability Under Continuous or Intermittent Force.
- Source :
- International Journal of Oral & Maxillofacial Implants; 2014, Vol. 29 Issue 4, p819-825, 7p, 8 Color Photographs, 1 Black and White Photograph, 1 Chart, 1 Graph
- Publication Year :
- 2014
-
Abstract
- Purpose: To evaluate and compare the influence of continuous and intermittent forces on stability of titanium microscrews. Materials and Methods: One hundred forty-four microscrews were inserted bilaterally in the intraradicular zones of the maxillary first molar and second premolar in 36 beagles. Loads were delivered consecutively in the continuous group (n = 12), in cycles of 12 hours on/paused for 12 hours in intermittent group A (n = 12), and in cycles of 24 hours on/paused for 24 hours in intermittent group B (n = 12). The on/off cycles were repeated for 1, 3, 5, or 7 weeks, after which the animals were sacrificed, and microcomputed tomography (micro-CT) and pull-out testing were performed. Results: The micro-CT parameters of the microscrews in all three groups increased gradually with loading time. The value of peak load at extraction (Fmax) increased and reached a peak at week 5 but dropped slightly at week 7. In the continuous group, all measurements were lower than those in the intermittent groups at all times examined. All values in intermittent group A were higher than those in intermittent group B. Conclusion: An intermittent loading regimen appears to be more favorable for obtaining stability than continuous loading, and a 12-hour/12-hour on/off loading cycle is superior to a 24-hour/24-hour on/off protocol in promoting bone-implant contact. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 08822786
- Volume :
- 29
- Issue :
- 4
- Database :
- Complementary Index
- Journal :
- International Journal of Oral & Maxillofacial Implants
- Publication Type :
- Academic Journal
- Accession number :
- 96996528
- Full Text :
- https://doi.org/10.11607/jomi.3191