Resurfacing arthroplasty for patients with osteonecrosis.
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The suitability of third-generation metal-on-metal hip resurfacing products for patients with a primary diagnosis of osteonecrosis has been debated. The preservation of femoral head bone stock for femoral prosthetic support is essential for the long-term stability of implants. A modern hip resurfacing system was implanted in 1148 hips as part of a United States multicenter investigational device exemption study. Of these, 116 hips had a preoperative diagnosis of osteonecrosis and were compared to 1023 hips with osteoarthritis. Survival rates were not significantly different (95.9% and 95.8% at 24 months for osteoarthritis and osteonecrosis respectively, p = 0.46). Resurfacing arthroplasty for patients with osteonecrosis appears to be a reasonable alternative, taking into consideration implant size, patient gender, and size of femoral deficiency. Further characterization is needed to identify those specific patients with osteonecrosis for whom resurfacing arthroplasty would be appropriate. (+info)
Bare-metal stents versus drug-eluting stents in large (>/=3.5mm) single coronary artery: angiographic and clinical outcomes at 6 months.
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Influence of a denture strengthener on the deformation of a maxillary complete denture.
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The present study investigated the influences of a denture strengthener on the deformation of a maxillary complete denture. Three groups of maxillary complete dentures were fabricated (Group 1 without a strengthener; Group 2 with a Co-Cr alloy wire strengthener; Group 3 with an experimental fiberglass strengthener). The denture deformation during occlusal load was monitored using four rosette strain gauges. The maximum principle strain (MPS) of each gauge, except for that at the labial frenum, increased proportionally with the increase of the applied load. The MPS at the incisive papilla (IP) was consistently the highest among the measuring positions regardless of the denture types. The MPS at IP in Group 1 was significantly higher than those in Groups 2 and 3 when the applied load was equal (p<0.05). These results suggested that the strengthener in the acrylic maxillary complete denture would reduce deformation of the denture during occlusal loading. (+info)
Effect of casting atmosphere on the shear bond strength of a ceramic to Ni-Cr and Ni-Cr-Be alloys.
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