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Biomedical subjects

A Weinreich

Publications and source records attributed to A Weinreich.

16 recordsLinked to original sources
PubMed1991

[The bite-jumping-appliance].

By the development of the bite-jumping-appliance (BJA) the wearing comfort for the patient was significantly improved and also the handling through the doctor was multiple facilitated. 1. While treating with the BJA the forward advancement of the mandible can be done simultaneously with the harmonizing of the maxillary and mandibular dental arches. 2. The wearing comfort during the day time, as well as the speech with the BJA in the patients mouth is possible without any problems due to the fact, that the BJA consist of two separate appliances. 3. The functioning of the BJA can be improved while using extraoral forces. Also the wearing of the BJA without extraoral forces leads to a headgear effect onto the maxilla. 4. Also uncontrolled muscle activities during the night leads, if the muscle activity is great enough, to a total biting together. 5. To avoid the contact between protrusive sticks and inclined plane in the lower appliance, the patient will bring unconsciously the mandible, while speaking during day time, in a more anterior position. This training effect leads to an accelerated forward advancement of the mandible as well as to an accelerated harmonizing of the muscular chewing pattern in the anterior position. 6. A harmonized muscular chewing pattern in the sagittal plane as well as in the frontal plane can be achieved in nearly all patients after finishing the BJA-therapy. These results couldn't be achieved with other bimaxillary appliances [28].

Activator Appliances↗
PubMed1990

[Criterias for the selection of neckstraps in therapy with extraoral forces].

1. Considerable differences could be measured in the force-deflexion-diagram whilst using different neckstraps. These differences could be explained by the different material qualities. 2. Force-deflexion-diagramm achieved in vitro could not be transfered directly to the therapy of patients. 3. Extreme asymmetrical force distributions at the outer bows will arise during the therapy with extraoral forces, because of the friction between skin, textile neckstrap and adjustable traction bands. These asymmetrical force distributions will arise particularly during functional movements of the head. Turnings and noddings lead to extreme values, by reaching the maximum asymptotically. 4. The use of a force snap-away neckpad also often leads to asymmetrical force distributions at the outer bows. 5. Asymmetries occur less often whilst using the low-cervical-pull according to Sander, due to the reduced friction between the two plastic parts of this headgear system. Head movements nearly always lead to an equalization of the forces at the outer bow. Extreme forces last less than one second. The mean value of the force at the outer bow, ascertained over a longer period, is only a little bit less than the force of 500 g adjusted at the beginning. 6. The mean value of the forces measured over a longer period while wearing an adjustable traction band is nearly 50% less than the force adjusted at the beginning. 7. The adjustment of the force at the outer bows is done while the patient is sitting in an upright position. However the patient is normally very seldom in such a position so that, as a rule, the forces at the outer bows are less than the adjusted force. 8. The problem of lesser forces at the outer bows can be compensated by a longer wearing period and by a higher initial force adjustment. 9. The adjustment of the force at the outer bow with the help of a spring-balance leads to inaccuracy and, as rule, the real force application to the molar is significantly less. 10. Only the wearing of the low-cervical-pull according to Sander leads to reproducible force values during head turning and noddings. Also the mean force value corresponds to the initial applied force. 11. While using an adjustable traction band it is advisable to change this often during the treatment. Otherwise the function of the treatment with the extraoral force will be reduced because of the loss of elasticity of the traction band.

Dental Stress Analysis↗
PubMed1978

The cerebral function monitor during open-heart surgery.

Open-heart surgery has entered the third decade of its existence. The period has demonstrated increased patient safety during and after open-heart surgery due to the employment of simple and reliable monitoring techniques. The monitoring of the function of the brain has not kept pace with these advances. Electroencephalographic (EEG) method is impractical for routine use in the operating room and in the intensive care unit. The cerebral function monitor (CFM) offers simplified continuous monitoring and interpretation of cerebral electrical activity (integrated EEG) in the clinical situation. The unit displays a two channel tracing, one representing cerebral activity and a second indicating electrode impedance artefacts. The early changes seen in addition to other conventional monitoring of the electrocardiogram, blood pressures, pulse rate, etc. offers information especially pertinent to open-heart surgery. It would appear that there is a place in anesthetic practice during and after cardiopulmonary bypass for the routine use of the CFM to supplement existing monitoring for the safer conduct of open-heart surgery. This study analyzes the value of a cerebral function monitor in 112 patients undergoing open-heart surgery.

Brain↗
PubMedDate not supplied

Perioperative awareness and recall.

This study was designed to introduce a relevant stimulus at successive time intervals during the entire anesthetic period, including the pre- and postanesthetic periods. Using galvanic skin responses, the authors were able to recognize a plane of light anesthesia and arousal, at which time it is considered that sensory input might be perceived. Presenting to the patient a stimulus of some relevance, but one not likely to be psychically traumatic, they investigated the correlation between the ability to maintain an attention span and to recall in the postoperative period. No recall was obtained during the intraoperative period, the first occurrence of recall being in the immediate postanesthetic period and the incidence of recall increasing with increasing time intervals after the end of anesthesia. The authors conclude, however, that since intraoperative awareness without recall is a possibility, care should be taken to avoid emotionally disturbing auditory stimuli throughout the anesthetic procedure.

Adolescent↗