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At least 19 recordsLinked to original sources
PubMed1979

Stress analysis of single-tooth implants. I. Effect of elastic parameters and geometry of implant.

Five different implant materials and three different geometries of ankylosed single-tooth implants were investigated. The stress distributions within and around the implants were determined by finite element analysis. Results show that the optimal combination of implant material and geometry can reduce implant and alveolar stresses by a factor of three when compared to an arbitrary implant design.

Alveolar Process↗
PubMedDate not supplied

Silicone implant arthroplasty of the great toe. A review of single stem and flexible hinge implants.

One hundred sixty-five feet were reconstructed with the single stem silicone implant, including patients with hallux regidus, hallux valgus due to degenerative and osteoarthritic joint changes, hallux valgus secondary to rheumatoid arthritis and patients with previous unsuccessful "bunion" procedures. Preoperative pain and intolerance to shoe wear were relieved in the great majority of patients. The amount of correction of the hallux valgus angle was directly related to the preoperative deformity. Infection occurred in 2 patients, and inflammatory reaction to the implant occurred in one patient. One hundred five feet were reconstructed with a flexible hinge implant; 94 of the feet had joints destroyed by rheumatoid arthritis. Dramatic improvement in the hallux valgus angle resulted in these feet which had relatively severe preoperative deformities. No implant fractures were recorded. The present survey of our cases, and experiences reported by others, encourage the use of these implants by surgeons who follow the suggested indications, surgical technique, and follow up care.

Adolescent↗
PubMed1977

Effects of cyclophosphamide treatment before implantation on the development of rat embryos after implantation.

After treatment of pregnant rats 24 h before implantation with a single injection of cyclophosphamide (20--80 mg/kg), a dose-dependent increase in resorption was observed at term but no malformed fetuses could be found. The lowest cyclophosphamide dose that caused 100% resoprtion was 60 mg/kg. Somite number and wet weight indicated retardation of about 24 h during organogenesis. Determination of the time of implantation revealed that the developmental retardation in treated embryos was not due to delayed implantation. At implantation, 24 h after cyclophosphamide treatment, a significant and dose-dependent decrease of the cell number of blastocysts was found. Embryo transplantation experiments showed that early cyclophosphamide treatment interfered with the subsequent development of both the embryo and the mother. The decidual reaction seemed to be more affected by the treatment than the embryos. Most teratologists hold that mouse embryos after treatment in the preimplantation period either die before implantation or survive to term without being malformed. The present study, however, proves that the reaction of drugs at this early stage of pregnancy is more complex than is generally assumed.

Animals↗
PubMed1979

The influence of functional use of endosseous dental implants on the tissue-implant interface. II. Clinical aspects.

Functional and non-functional endosseous dental implants were clinically compared in beagle mandibles for up to one year post-operatively. Differing biomechanical conditions led to clinical differences between functional and non-functional implants. Typical clinical tests, however, did not always reveal detailed histological differences between implant-tissue interfaces of functional and non-funcional implants.

Alveolar Process↗
PubMed1979

[Subdiaphragmatic pacemaker implantation of pacemakers - results of 1150 implantations].

Permanent pacemaker are presently used on patients with chronic disease of the cardiac conduction system, with recurrent Adams-Stokes attacks, and with bradycardia. 1865 pacemakers have so far been implanted in the unit for special thoracic surgery in the University of Heidelberg from 1965 to 1978. In 1.150 (or 61%) patients the pacemaker was implanted using the subdiaphragmatic method. A lower transverse pericardiotomy was performed and the battery was located in the rectus abdominis sheath. In the remaining 715 (or 39%) patients, the electrodes were introduced transvenously and implanted in the endocardium. The battery unit in this case was located beneath the pectoral muscle. The transvenous approach was the method of choice until 1971; from that time onward the subdiaphragmatic approach gradually replaced it as the method of choice. Between 1971 and 1978 80% of the pacemakers were implanted directly into the myocardium whereas only 20% were introduced transvenously. The subdiaphragmatic method completely eliminates the frequent complications of the transvenous approach, such as dislocation of electrodes and others so that it now is our method of choice.

Diaphragm↗
PubMed1979

The influence of functional use of endosseous dental implants on the tissue-implant interface. I. Histological aspects.

The tissue-implant interfaces of functional and non-functional endosseous dental implants were compared histologically for up to one year post-operatively. Nonmineralized connective tissue zones (a "fibrous capsule") existed in all functional interfaces. Direct, or nearly direct, bone apposition to implants occurred in non-functional interfaces. The origin of this result and its significance in dental implantology is discussed.

Alveolar Process↗
PubMed1979

Endolymphatic sac valve implant surgery. II: The unidirectional inner ear valve implant.

A unidirectional inner ear valve implant was developed to direct excess endolymph out of the inner ear in the hydropic state (Ménière's disease) into the mastoid cavity. A detailed technical description of the valve implant is presented as well as some technical aspects of the valve implant based on the surgical anatomy of the endolymphatic sac.

Ear, Inner↗
PubMed1975

The presence of paternal H-2 antigens on hybrid mouse blastocysts during experimental delay of implantation and the disappearance of these antigens after onset of implantation.

The presence of paternal H-2 antigens on hybrid mouse blastocysts before and during implantation was investigated by means of the isotope anti-globulin technique. It was found that experimentally delayed blastocysts possess paternal H-2 antigens whereas these antigens can no longer be detected 14 hours after estradiol activation of delayed blastocysts.

Animals↗
PubMed1979

Paravalvular fistula in mitral valve implant. Intimation of malfunction of implant and quantification of regurgitant flow from effective area measurements.

Non-invasive ultrasound Doppler registrations and cardiac output determinations with a thermodilution catheter were performed in the presence of and after closure of a paravalvular mitral fistula in a 52-year-old patient with a 27 mm Björk-Shiley mitral valve. The data collected allowed the calculation of the regurgitant flow through the fistula. This study suggests that the method used can be of diagnostic value when mitral valve implant malfunction is suspected.

Cardiac Output↗