Oral & Craniofacial Tissue Engineering 2 (2012), No. 4 15. Dec. 2012
Oral & Craniofacial Tissue Engineering 2 (2012), No. 4 (15.12.2012)
Biomechanics and Peri-implantitis: The Effect of a Subcrestal Wing-Thread to Decrease Alveolar Crestal Bone Strain. Theory, Finite Element Analysis, and Clinical Application
Laster, Zvi / Weissberg, Ilan / Kablan, Fares
Purpose: This study used finite element analysis and a clinical case example to test the hypothesis that a wing-thread placed 4 mm below the top of an implant would decrease crestal bone loss in function.
Materials and Methods: Finite element analysis was used to compare standard and wing-thread implants subjected to axial and off-axis forces based on the hypothesis that decreasing bone strain at the alveolar crestal margin improves peri-implant bone stability. A clinical case example of the wing-thread implant was followed for 30 months.
Results: Stress concentration was diminished at the crest when a wing-thread was used compared to a standard implant body. Ninety-degree lateral forces were diminished by a factor of 10 in the wing-thread implant. A patient followed for 30 months showed stable bone levels around the wing-thread implants.
Conclusion: The wing-thread hypothesis appears to have some support for increasing bone stability based on finite element analysis and early clinical results.
Keywords: biomechanics, bone loss, bone strain, mechanostat, peri-implantitis, wing-thread