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Results for “PROSTHESES”

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At least 55 records · Page 3Linked to original sources
PubMed2001

Increased loosening of cemented straight stem prostheses made from titanium alloys. An analysis and comparison with prostheses made of cobalt-chromium-nickel alloy.

We studied the rate of aseptic loosening of three different types of femoral stems in primary total hip replacement. After a median follow-up of 10.2 years 4/147 CoCrNi (SS77) straight stems (type M.E. Müller) were revised. After a median follow-up of 7.7 years 32/239 Ti-6A1-7Nb (SS77) were revised and after a median follow-up of 5.2 years 52/203 SLS Titanium alloy stems were revised. Whereas the first two stems are of identical design (smooth-blasted, anterior and posterior collar), the SLS stem design is different. Surgical procedure and cementing technique have remained unchanged. There is a significantly higher risk of failure for smaller titanium stem sizes and in males and patients who are physically active. This indicates that the greater elasticity of the Titanium alloy is one of the factors responsible for loosening.

Aged↗
PubMed1991

Measurement of oral status and treatment need among subjects with dental prostheses: are the measures less reliable than the prostheses? Part III: Fixed prosthodontics and restorative dentistry.

Poor quality measures of oral status and treatment need have adversely affected clinical and epidemiologic research in prosthodontics. The failure to create reliable and valid indices prevents comparing and pooling data from different studies and obscures meaningful variation within individual studies. Part III of this literature review is focused on problems of measurement of restoration quality and need for treatment in the areas of fixed prosthodontics and restorative dentistry.

Crowns↗
PubMed1991

Measurement of oral status and treatment need among subjects with dental prostheses: are the measures less reliable than the prostheses? Part II: Treatment need in removable prosthodontics.

Evaluation of treatment need in removable prosthodontics has been an important component of many epidemiologic and clinical oral health surveys. Accurate measurement of need for care enhances health care program planning, quality of care evaluation, and good clinical and health services research. Unfortunately, similar to the measures of oral and prosthesis status discussed in Part I of this review, measures of treatment need in removable prosthodontics have generally been neither reliable nor valid, and have lacked scientific credibility. Part II describes existing measures for treatment need in removable prosthodontics.

Dental Care↗
PubMed2006

NeuFlex compared with Sutter prostheses: a blind, prospective, randomised comparison of Silastic metacarpophalangeal joint prostheses.

Forty patients (156 metacarpophalangeal joints) with mutilating rheumatoid arthritis were randomly allocated in a blinded manner to have either NeuFlex or Sutter implants. Indications for operation were pain and severe deformity. Thirty-nine patients were followed up postoperatively for one year. An independent physiotherapist and occupational therapist examined each one. Grip strength, range of motion, and pain during activity and at rest were measured. The Canadian Occupational Performance Measure (COPM) assessed the patients' evaluation of their occupational performance. Both groups had overall good results, but it seems that though patients' mobility and grip strength improve considerably, pain seems to do so only relatively. Most patients seem to be satisfied with the operation and their functional gain. Five out of 78 Sutter and two out of 78 NeuFlex implants broke. We found no major differences between the two designs, but the patients in the NeuFlex group seemed to be more satisfied with their occupational performance (COPM performance) (p=0.05).

Adult↗
PubMed1983

In vitro thrombogenicity test of materials used in arterial prostheses. Comparison of fibrin deposition from blood on glass polystyrene and arterial prostheses.

Coagulation rates in fresh, normal, venous blood was investigated when a given volume of blood was allowed to contact various materials of equivalent surface area, at 22 degrees C, without disturbance. The coagulation rate was determined indirectly by measuring residual thrombin-clottable fibrinogen in cell-free supernatants after arresting coagulation at fixed time intervals with a Ca++-chelating type of anticoagulant and comparing the thrombin-clottable fibrinogen content of the test samples with control samples of blood anticoagulated immediately after venipuncture. In glass containers, after initial formation of the clot, progressive fibrin formation, measured by the rate of disappearance of thrombin-clottable fibrinogen, was found to take place as a gradual and linear progressive process not complete at 30 min after venipuncture with blood stored undisturbed at 22 degrees C. Various graft materials in tubular form were prepared to ensure equivalent blood surface contact. These were investigated for their influence on fibrinogen to fibrin conversion of fresh venous blood in a 15-min period at 22 degrees C. Fibrin formation was greatest in microvel pre-treated with clotting blood and decreased in the following order: microvel, woven Dacron, knitted dacron and Gore-tex. Gore-tex showed by far the least thrombogenicity of all the tested graft materials. We discuss our reasons for making our measurements under non-flow conditions and the reason for measuring fibrinogen to fibrin conversion rather than measuring platelet deposition on the various surfaces.

Arteries↗
PubMed1993

Myoelectric prostheses. A long-term follow-up and a study of the use of alternate prostheses.

Forty-four patients who had had a total of forty-seven amputations of an upper extremity and who had had a myoelectric prosthesis for more than two years were evaluated retrospectively for the amount of use of the prosthesis, the use of any other prosthesis, and the demographic factors that might be related to use of the prosthesis. The average duration of follow-up was five years (range, twenty-five months to seventeen years). Forty of the forty-four patients also had a conventional prosthesis. Twenty-two patients (50 per cent) rejected the myoelectric prosthesis completely; thirteen (32 per cent) of the forty patients who also had a conventional prosthesis rejected the conventional prosthesis completely. The patients who used the myoelectric device the least were employed in occupations that required high-demand use of the prosthesis (lifting of more than 4.5 kilograms [ten pounds] or repetitive manual labor) or were receiving or seeking Workers' Compensation, or both.

Adolescent↗