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At least 1,783 records · Page 99Linked to original sources
PubMed1989

Feasibility test of a new method to measure retinal thickness noninvasively.

There are many devastating ocular diseases that are directly related to an alteration of the retinal or nerve fiber layer thickness, such as glaucoma and macular edema. To diagnose these diseases earlier and to monitor their therapy more sensitively, an accurate measurement of the tissue thickness is needed. Since no clinical method is currently available, we developed and tested a new method capable of measuring noninvasively the retinal thickness. The separation between the images of the anterior and posterior intersections is quantitated by an optoelectronic system. The theoretical performance of the method has been calculated. Tests of the method in a model eye indicated that the measurements were basically diffraction limited, their reproductivity was +/- 9 microns, and their accuracy was 5.5 microns. Tests performed in vivo indicated that two intersections between the laser and the retina are present and correspond to the anterior and posterior surfaces of the retina. These intersections can be resolved and analyzed to yield quantitative data. These encouraging results indicate that this method is feasible and could yield sensitive measurements of the retinal thickness.

Calibration↗
PubMed1986

Analogue femurs for laboratory investigations of prosthesis stress distributions and fixation failures.

A polymeric analogue femur in combination with a brittle-coating stress-analysis technique was used to compare the relative femoral surface-strain distributions for various hip prostheses. The influence of prosthesis design factors, such as the geometry and material, the effect of a collar, and surface texturing, were readily ascertained and in agreement with previous investigations using other techniques. The fixation failures observed with this laboratory test model were similar to those of published clinical findings.

Bone Cements↗
PubMed1988

Personal microcomputer-aided three-dimensional reconstructions.

A fast, cheap and simple method is described which enables three-dimensional reconstructions to be produced from short series of sections. The reconstruction is formed and displayed either as a full line or hidden line diagram or shaded model. It may be rotated, magnified or reduced, all with the aid of a personal microcomputer, peripherals and software, the total cost of which does not exceed several hundreds of US dollars.

Animals↗
PubMed1988

A new instrument for mercury vapor evacuation during clinical work with dental amalgam.

Clinical work with dental amalgam, cutting as well as filling and polishing operations, results in an increased level of mercury vapor in the breathing zone of the patient and often also in that of the dentist. The mercury levels can be minimized by the use of a high volume evacuator which is handled by the nurse. Since many dentists cannot count upon continuous chairside assistance during work with dental amalgam a new instrument, combining the functions of a common dental mirror and an evacuator has been developed. The aim of the present work was to evaluate the mercury vapor evacuating capacity of the new instrument. The study was carried out in a model box especially designed for the in vitro tests performed. The amount of mercury in an area representing the patient's breathing zone was recorded directly and indirectly using an equipment based on atomic absorption spectrophotometry. The results revealed that the new instrument has the capacity for substantially reducing the mercury levels during filling, polishing and cutting amalgam. Thereby the short transitory exposure to mercury vapor during certain working moments can be reduced which should be beneficial both to the patient and to the dental staff.

Air Pollutants, Occupational↗
PubMed1988

[The fish hook technic--an aid in pulling tendon tissue through tight channels].

Pulling tendon grafts through narrow bone-holes often frays and tangles the tendon ends. The following knot technique results in a concentric compression of the tendon end. The line of pull is directed to the mid-portion of the implant and provides an axial force. The technique is demonstrated on the anatomic model as well as on clinical cases. The technique is simple to perform, involves minimal trauma to the implant, and requires only a very small drillhole in the bone to allow optimum tendon-bone contact and healing.

Bone and Bones↗
PubMed1987

[Methods for long-term storage of anatomical demonstration objects].

2 methods for longterm conservation of anatomical objects have been described. The former concerns the use of methylmethacrylate (the plastic material) for embedding of anatomical objects into different forms. The 2nd method uses the same plastic material for impregnation of anatomical objects. The authentic anatomical models produced by the both methods possess very good demonstrative features. They are solid and cheap.

Methylmethacrylate↗
PubMed1986

Cerebral magnetic fields.

A critical presentation is given about the state-of-the-art of neuromagnetism, the study of neural functions by the measurement of magnetic fields. First, an introduction is given about the neural origin of electromagnetic fields. The forward and inverse problems are then studied. The forward problem can be stated as follows: given electrical currents in the brain, calculate the magnetic field. Correspondingly, the inverse problem is to calculate currents in the brain from the magnetic field measured outside the head. The instrumentation necessary for successful neuromagnetic measurements is discussed, and the emphasis is on new developments. The review of experimental neuromagnetic results discusses studies on spontaneous cerebral magnetic fields in normal subjects and in epileptic patients. Furthermore, evoked-field studies of the various sensory modalities as well as studies of event-related fields are reviewed. The relevance of various efforts in neuromagnetism and prospects for the future are discussed.

Biomedical Engineering↗