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Biomedical subjects

R Sader

Publications and source records attributed to R Sader.

43 records · Page 3Linked to original sources
PubMed1995

[New possibilities in computer-assisted image processing for ultrasound diagnosis in mouth-jaw-facial surgery].

The use of a digital image processing system in ultrasound diagnostics offers not only the advantage of a space-saving archiving without loss of quality, but also a clearly higher efficacy of the examination is achieved. An interactive of system findings leads to a more complete examination and evaluation, thus increasing the reliability and the objectivity of the examination. The standardized findings by use of text components mean at the same time a clear saving of time. Moreover, this system is very comfortable not only for the comparison of different images, but also for the scientific evaluation and processing of the image data. By digitalizing the sonographic images the visual data can be processed in a personal computer. Thereby, for maxillofacial surgery a simple and fast dynamic-functional evaluation of the temporomandibular joint was made possible. By archiving without loss of quality and by higher reliability, objectivity and efficacy of the sonographic examination important preconditions for quality care in ultrasound diagnostics have been achieved.

Head and Neck Neoplasms↗
PubMed1994

[High-frequency videocinematograpphy for the objective imaging of the velopharyngeal closure mechanism in cleft palate patients].

The use of high-frequency video cineradiography makes possible an objective and dynamic rendering of the individual velopharyngeal closer pattern. The high resolution and the depiction of the finest mucosal structures while in motion achieved by this technique opens up the possibility of exact and objective 3-dimensional evaluation of the velopharyngeal gap. Following secondary velopharyngoplasty on 80 cleft palate patients, the velopharyngeal closure was studied by means of high-frequency video cineradiography and this rendering was then compared to results obtained by nasoendoscopy and to the clinical findings. It became definitely apparent that the radiological technique is markedly superior in relation to clearness of depiction and ease of use, especially in young children. This imaging technique can be recommended without reservation for pre- and postoperative control of speech-improving procedures.

Adolescent↗
PubMed1994

[Functional and esthetic results after reconstruction of orbital walls].

From 1985 to 1992 40 patients with large defects of the orbital wall were operated by reconstructive surgery. Defects were caused by trauma (35), facial cleft (3), tumor (1) and osteoradionecrosis (1). Small defects were covered with lyophilised dura mater or thin PDS-film, larger defects with autogenous or xenogenous cartilage, PDS-plates, ceramic plates or titanium micro mesh. After tumor surgery and osteoradionecrosis the orbital wall was reconstructed with free resp. microvascularised bone. In all cases a clear improvement of the initial position was possible. Dislocation of the zygomatic bone should be corrected by osteotomy in order to reconstruct as much as possible of the orbital wall with local bone.

Esthetics↗
PubMedDate not supplied

Speech evaluation and swallowing ability after intra-oral cancer.

In this study, four methods of postoperative speech evaluation are compared for 19 persons with oral cancers who have undergone oral surgery and/or radiotherapy. The Munich Intelligibility Profile was used for intelligibility testing and semiquantitative scoring by novice listeners. Expert ratings were done on the Therapy Outcome Measure (TOM) Phonological Disability form. For self-evaluation, the EORTC QLQ-C30 and the Head and Neck module was used. Swallowing function was scored on the TOM Dysphagia form. There was a high intercorrelation between the results of subjective speech evaluation by experts and non-experts and the intelligibility test, but no correlation with any of these methods could be shown for the self-evaluation by the participants. Voice quality seemed to have an influence on non-expert scores. Swallowing was a more severe problem for our group than speech impairment.

Aged↗
PubMedDate not supplied

[Numerical simulation (FEM) of the human mandible: validation of the function of the masticatory muscles].

The article describes part of a research project aiming to develop a new modular software tool for the individual dynamic numerical simulation of the human mandible using the finite element method (FEM). Its planned use in the clinical setting makes it very important to validate the results of the simulations. Here, the function of the masticatory muscles is to be tested. On the basis of biomechanical data from the literature, standard movements, such as closing the mouth, forward movement, lateral movement or backward movement, were dynamically simulated. Apart from muscle activity, the movements of the mandible are defined by the temporomandibular joint. At present, translating the condylar dynamics to the simulation still poses problems. For this reason, therefore, simulations of the two extreme cases "fixed" and "force-free" condyles are compared. While in the case of fixed condyles, some of the movements could be reproduced either not at all or only weakly, in the case of force-free condyles, all standard movements were reproduced qualitatively, albeit without the guiding effect of the joint capsule or the articular disc.

Biomechanical Phenomena↗