Effects of pilot holes on longitudinal miniscrew stability and bony adaptation
| Autor: | Lauren Ohlenforst Carney, Robert Spears, Ana Cláudia Moreira Melo, Phillip M. Campbell, Peter H. Buschang, Richard F. Ceen |
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| Rok vydání: | 2014 |
| Předmět: |
Outer diameter
Time Factors Materials science Bone Screws Dentistry Orthodontics Mandible Vibration Random Allocation Dogs Imaging Three-Dimensional Bone Density Osseointegration Image Processing Computer-Assisted Orthodontic Anchorage Procedures Animals Isotropic resolution Dental Implants Random allocation Wound Healing Miniaturization business.industry X-Ray Microtomography Microcomputed tomography Implant stability quotient Trabecular bone Female Bone Remodeling Implant business Bone volume |
| Zdroj: | American Journal of Orthodontics and Dentofacial Orthopedics. 146:554-564 |
| ISSN: | 0889-5406 |
| DOI: | 10.1016/j.ajodo.2014.07.017 |
| Popis: | The purposes of this study were to longitudinally evaluate the effects of pilot holes on miniscrew implant (MSI) stability and to determine whether the effects can be attributed to the quality or the quantity of bone surrounding the MSI.Using a randomized split-mouth design in 6 skeletally mature female foxhound-mix dogs, 17 MSIs (1.6 mm outer diameter) placed with pilot holes (1.1 mm) were compared with 17 identical MSIs placed without pilot holes. Implant stability quotient measurements of MSI stability were taken weekly for 7 weeks. Using microcomputed tomography with an isotropic resolution of 6 μm, bone volume fractions were measured for 3 layers of bone (6-24, 24-42, and 42-60 μm) surrounding the MSIs.At placement, the MSIs with pilot holes showed significantly (P 0.05) higher implant stability quotient values than did the MSIs placed without pilot holes (48.3 vs 47.5). Over time, the implant stability quotient values decreased significantly more for the MSIs placed with pilot holes than for those placed without pilot holes. After 7 weeks, the most coronal aspect of the 6- to 24-μm layer of cortical bone and the most coronal aspects of all 3 layers of trabecular bone showed significantly larger bone volume fractions for the MSIs placed without pilot holes than for those placed with pilot holes.MSIs placed with pilot holes show greater primary stability, but greater decreases in stability over time, due primarily to having less trabecular bone surrounding them. |
| Databáze: | OpenAIRE |
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