Journal of long-term effects of medical implants最新文献

Fourier transform infrared spectroscopy was used to evaluate the molecular structure of bone tissues of patients who underwent revision of total hip and shoulder arthroplasty. The intensity increase of the spectral bands in the region of 3000-2850 cm-1 provided information about the increase of the lipophilic environment, which supported the formation of aggregates and amyloid protein formation. The appearance and the intensity increase of the "marker band" at 1744 cm-1 suggested protein peroxidation and inflammation progression. The shift of the amide I and amide II absorption bands from 1650 cm-1 and 1550 cm-1, respectively, to lower frequencies was related to changes of collagen conformation structure from α-helix to β-sheet and random coil. The appearance and shifts of the new bands in the region 1200-900 cm-1 were related with the increasing of glycosylation upon inflammation. Important was also the disappearance of the hydroxyapatite vPO43- absorption bands at the spectral regions 1200-900 cm-1 and 550-650 cm-1 indicated the osteolysis development. Moreover, the formation of corrosive metallic implants confirmed the effect of oxidative stress on the development of periprosthetic joint infection.

Dental implantology has made great strides since Dr. Brånemark introduced it to the world of dentistry. In terms of materials and fabrication processes, a wide range of implants and their implant abutments are now widely available in the market. Such a wide range would undoubtedly put the clinician in a quandary when it comes to selecting an acceptable abutment, one that is scientifically based and also has a high clinical rate of success. As a result, this literature review is a straightforward attempt to shed light on the wide range of implant-abutment types, materials and fabrications that are now easily accessible on the market, as well as offer an overview of each specific type to avoid further dilemma for its clinical intent.

Although extensor mechanism failure remains a catastrophic complication of knee arthroplasty, there are a number of contemporary techniques with reasonable outcomes that restore function. Chronic failures require advanced reconstruction techniques. Similar complication rates have been reported for the use of autografts, allografts, or mesh reconstructions. Here, we describe our surgical technique in allograft extensor mechanism reconstruction for chronic failures in salvage revision knee arthroplasty using a complete extensor mechanism allograft with a modified proximal fixation and case demonstrations.

The prosthetic replacement is achieved for the functional aspect of the stomatognathic system. Achieving prosthetic occlusion is challenging and has an occlusal concept of its own when the type of prosthesis varies. The implant occlusion differs for its load transfer concept and longevity. The study was employed to assess the dynamic occlusal contact in implant occlusion through digital means. The study was carried out on implant prosthesis and its dynamic parameters were evaluated using T-Scan Novus (BioResearch, Inc., Brown Deer, WI, USA) in a university hospital setting after collecting 35 patients. Mandibular arch prosthesis tends to swing from high intensity to low or no contacts frequently and when the percentage of implant crown contact at 10% is present there is more of implant protected occlusion achieved. Use of T-Scan Novus can reveal more occlusal details in functional form which can help in achieving new treatment goals.