E Schepers — Page 2 | PubMed Health

PubMedDate not supplied

Adaptive bone remodeling around oral implants under axial and nonaxial loading conditions in the dog mandible.

An experimental animal model is presented for the analysis of the influence of axial and nonaxial loading on bone remodeling around oral implants. Axial and nonaxial loading conditions were introduced by placing a bilaterally supported fixed partial prosthesis and a cantilever fixed partial prosthesis on two IMZ implants in the mandibles of beagle dogs. Quantitative and qualitative histologic analyses revealed different remodeling tendencies between the loading conditions. Axial loading induced a more uniform, histologically quiescent remodeling response that gradually decreased from the coronal aspect to the apex of the implant. Nonaxial loading elicited a more dynamic remodeling of the surrounding cortical and especially trabecular bone tissue.

Adaptation, Physiological↗

PubMedDate not supplied

Implant placement enhanced by bioactive glass particles of narrow size range.

Poor bone quality and quantity are often related to implant failure. Synthetic bone grafts may be used to enhance the formation of new bone in bone defects. The purpose of this animal study was to determine the efficacy of bioactive glass particles of narrow size range (300 to 335 microns, Biogran) in the treatment of bone defects prior to implant placement. On both sides of the mandible of six beagle dogs, areas of partial edentulousness were created by the removal of the intra-alveolar septa to obtain large defects, instantly filled on one side with bioactive glass particles. The other side was left empty as a control. After a healing period of 4 months, three oral implants each were placed in the glass-treated area and in the control zone. In three dogs, the implants were left subgingival for 3 months after which histologic sections were made. In the remaining three dogs, the implants were functionally loaded with a fixed partial prosthesis for 7 weeks before sacrifice. Qualitative and quantitative analysis of both groups revealed statistically significantly more bone tissue and higher remodeling activity at the interface and at a distance of implants placed in glass-treated areas, compared to implants placed in untreated regions. Implant placement in bioactive glass-filled defects was not jeopardized, on the contrary.

Alveolar Bone Loss↗