Papers by Keyword: Bone Resorption

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Authors: S. Josse, C. Faucheux, A. Soueidan, G. Grimandi, D. Massiot, B. Alonso, Pascal Janvier, S Laïb, Jerome Guicheux, B. Bujoli, Jean Michel Bouler
Abstract: One type of potent aminobisphosphonate (Zoledronate) has been chemically associated onto b-tricalcium phosphate [b-TCP] and calcium deficients apatite [CDA]. Two different association modes have been observed, according to the nature of the Calcium Phosphate [CaP] support and/or the initial concentration of the Zoledronate solution. b-TCP appears to promote Zoledronate-containing crystals formation. On the other hand, at concentrations < 0.05 mol.L-1 CDA seems to undergo chemisorption of the drug through a surface adsorption process, due to PO3 for PO4 exchange, which is well described by Freundlich equations. At concentrations > 0.05 mol.L-1, crystalline needles of a Zoledronate complex form onto the CDA surface. The ability of CDA to release Zoledronate, resulting in the inhibition of osteoclastic activity, was shown using a specific in vitro bone resorption model.
Authors: Jun Ning Chen, Rohana Ahmad, Michael V. Swain, Wei Li, Hanako Suenaga, Qing Li
Abstract: Implant-retained overdenture has been widely applied as a solution to edentulous ageing; however, a major concern for the denture wearers is bone resorption induced by the prosthetic interaction with soft tissue and bone. Early studies have revealed that the bone resorption is associated with the disturbance to the mucosa blood flow. This study aimed to investigate the contact pressure induced by an implant-retained overdenture, compared to a conventional complete denture without implants, which implies the potential bone resorption for clinical investigation. A three-dimensional finite element model of a full jaw, including mandible bone, mucosa, and denture, was created through a reverse engineering method based on CBCT images, in which the hyperelastic behaviour of mucosa was determined by curve-fitting to the clinical measurement, for a more realistic response. It is found that the location of the bone loss differed between the implant retained and non-implant complete dentures. With the implants, the denture displaced more at posterior ends towards the mucosa bearing area, leading to higher contact pressure accounted for more severe local bone loss.
Authors: Fa Ming Tian, Liu Zhang, Hui Zhang, Jie Zheng, Da Cheng Han, Fang Yang
Abstract: Simvastatin, as one of the HMG-CoA reductase inhibitors for lowering lipids, has been demonstrated its potential benefit in bone formation, which was, however, conflicting and inconclusive in vivo studies. Thus, we performed this study to assess the in vivo effects of simvastatin on bone formation. Six-week old rats were administered with simvastatin (20 mg/kg/d) or vehicle for 6 or 9 weeks. All animals were sacrificed one day after the final administration. The left femora were removed for the measurement of bone histomorphometry and bone mineral density (BMD).Compared to the control groups, on both 6th week and 9th week, bone mineral density and bone histomorphometry detected no significant differences in bone mass and microarchitecture in simvastatin treatment group, as well as bone formatin/resorption parameters. These results indicate that simvastatin had no positive effect or impact on bone in rats administered with high dose simvastatin (20 mg/kg/d) for 6 or 9 weeks.
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