Biomedical subjects

R Pinkert

Publications and source records attributed to R Pinkert.

At least 19 recordsLinked to original sources

PubMed2000

[Comparative study of sagittal and coronal MRI of histological disk and temporomandibular joint specimen for examining an identity of anterior disk dislocation and anterior capsular connective tissue].

PROBLEM: Anterior dislocation of the articular disk of the temporomandibular joint (TMJ) found by MRI tomography often presents a problem. It may persist in MRI despite improvement of articular symptoms and even be found in healthy persons free of any symptoms. Can this be explained by the similarity in structure of the anterior connective tissue of the disk and capsule and their pathological changes? Is a second coronal plane required for MRI investigation? MATERIAL AND METHODS: The preauricular regions of 72 patients of the TMJ clinic were examined by oblique-sagittal and oblique-coronal MRI. A Siemens-Vision MRI was used. It was also possible to prepare 10 articular disks of the TMJ with anterior capsular tissue as well as 20 complete TMJs of adults from autopsy material. Sagittal, transversal, and horizontal serial sections were examined histologically. RESULTS: In 49 of the 72 cases examined, an anterior dislocation without reduction found in the sagittal MRI was not confirmed in the oblique-coronal MRI. In the sagittal MRI it was possible to differentiate three, in the coronal MRI six typical forms of magnetic resonance signals, which are represented in figures. They are compared with anatomical and histological connective tissue findings adjacent to the TMJ. The structural similarity of the disk and anterior capsular tissue of the TMJ is demonstrated. The close connection of the disk and connective tissue surrounding the TMJ makes differentiation of MRI findings difficult especially following regressive and adaptive reactions. CONCLUSIONS: In MRI, anterior capsular tissue is able to simulate dislocation of the disk. Pathological tissue reactions may alter the MRI signal and lead to the wrong diagnosis of dislocation of the disk. Diagnosis of an anterior disk dislocation cannot be established solely on the basis of oblique-sagittal MRI findings.

Adult↗

PubMed1999

[Anterior and lateral disk and capsule tissue of the temporomandibular joint and its relevance for temporomandibular joint diagnosis].

OBJECTIVE: Fibrocartilage that bears tensile stress is typically fixed bilaterally to adjacent bone by collagenous fibres. For the temporomandibular joint, such disc fixations in the anterior and lateral regions have not been described, even in MRT findings of anterior disc dislocations without reduction. By observing collagenous fibres of the anterior and lateral discuss and capsule tissue, we sought to establish whether tensile load capacities typical for fibrocartilage also apply to the discuss articularis of the mandibular joint in sagittal direction. MATERIALS AND METHODS: Using dissection material from 20 adult and 10 newborn temporomandibular joint specimens, the position of the caput mandibulae in the fossa mandibularis or below the tuberculum articulare was ascertained. Serial sections were stained using alternately haemotoxylineosin and the Goldner method. RESULTS: Collagenous fibres from the medial and lateral discuss insert into the corresponding caput pole and form the limit of the lower joint cavity. In the anterior capsule region, two fibres may be seen coming in similar fashion from the pes disci to the retrodiscal bilaminary zone. They are denoted respectively as inferior and superior stratum anterior. They limit the upper and lower joint cavity in anterior direction. Depending on motion, both experience various tensile loads, together with the inferior and superior stratum posterior. The tensile loads exerted are described and clarified with drawings. CONCLUSION: Collagenous fibres coming anteriorly and laterally out of disc fibrocartilage provide evidence that sagittal tensile loads are also exerted on discs. Disc dislocations without reduction can only occur when the collagenous fibres coming from the disc also have ruptured. A more critical evaluation of anterior disc dislocations would seem to be called for.

Adult↗

PubMed1990

[Plastic skull for practical education in stomatological radiology].

A plasticmodell of a skull manufactured by Deutsches Hygienemuseum Dresden, German Democratic Republic, was produced with Ba2SO4, natural teeth and special constructions for the practical training of students in Stomatological Radiology. Examples show the radiographed x-ray-photograms.

Audiovisual Aids↗

PubMed1990

[Individually produced open endosseous dental implants made of Bioverit glass ceramic. First report on experiences].

The glass ceramic "BIOVERIT" is characterised by biocompatibility, bioactivity and distinguished machinable treatment. The single casting in an especially dental technical laboratory pender is possible the individual production of dental implants. Described were the development of the form, the production and operation for these glass ceramic implants and first clinical results.

Biocompatible Materials↗

PubMed1989

[Studies on the development of mandibular rami lesions in clicking of the temporomandibular joint].

The laterotrusion of the mandible is often combined with the clicking of the temporomandibular joint. An optoelectronic measuring method renders it possible to exactly record the clicking and the position of the mandible at this moment. With this method 25 patients with an initial clicking were observed. Moreover the capiti mandibulae of dissections were measured in order to determine the width of the caput mandibulae and the size of the fovea pterygoidea mandibulae. The results show the connection of clicking, laterotrusion mandibulae, hypertrophy and dysfunction of the lateral pterygoid muscle. The therapy for the clicking is derived from this.

Adult↗

PubMed1988