[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.

[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.

Canthaxanthine retinopathy.

Background: A 42-year-old white female complaining of decreased vision was examined and small golden particles were found in the macular regions of both eyes. It was ascertained that the patient had been using an oral bronzing agent, canthaxanthine (Orobronze), for the previous 10 years.

Methods: The method of deposition of these crystalline particles and their possible sequela are presented.

[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.

[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.

[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.

The simultaneous presentation of retinopathy of prematurity and central serous chorioretinopathy.

A case report of central serous chorioretinopathy (CSC) and retinopathy of prematurity (ROP) in the same patient is presented. CSC is a disease of the outer retinal layers, specifically the retinal pigment epithelium, which results in serous detachment of the neurosensory retina. ROP is a disease of the anterior retinal layers, affecting the retinal vasculature.

[Autoradiographic determinations of carbon-14-labeled monomers and residual monomers in the tissues of Wistar rats after implantation of cold-polymerizing polymethyl methacrylate (bone cement) (author's transl)].

Self-setting acrylics, named bone cement, are taken for the reconstruction of bone defects, for the fixation of endothesis and fractures. A disadvantage of these rapid-cure acrylic compounds is the toxicity of its monomer. Infraredspectrographic measurements showed an absolute content of 12,3 per cent monomer in an acrylic-resin-compound-implant.

[Determining the cause of clicking from clinical, roentgenological, and histological results (author's transl)].

A cause of clicking is described. Results of clinical, roentgenological, and histological examinations show that clicking may be considered to be due to overstraining of the lateral ligament of the temporomandibular joint or of a muscle lying between the tuberculum articulare and the collum mandibulae, respectively. Straining is triggered by a connective-tissue and bony protuberance produced by mechanical irritation on the lateral capitulum mandibulae.

[The cup osteosynthesis, a stable osteosynthesis of mandibular fractures with metal cups and bone cement (Kallokryl K)].

The author describes a method for the stable osteosynthesis of mandibular fractures, for which five different steel-cups are fabricated. The cup is filled with fresh mixed cold-curing polymethylmethacrylate and pressed to the fragments. After polymerisation the stable osteosynthesis is arised.

[Determination of the residual monomer diffusion from implanted kallokryl-K bodies and their mandibular tissue reactions].

The paper, after discussing the problems associated with the implantation of cold-polymerizing polymethyl methacrylates, describes the methods and results of determining the diffusion of residual monomers from implanted Kallokryl K bodies. Also described and discussed are histological studies of the implant supporting tissue and possible consequences of the decreasing, but constant diffusion of residual monomers, respectively.

[The pathology of temporomandibular joint luxations--anatomical studies on temporomandibular joint preparations].

After a description of the published hypothesis of luxation and subluxation in the temporomandibular joint the preparations of five temporomandibular joints is described. The results refer to the movement of the discus and the capitulum mandibulae and to the effects of the musculus temporalis and of the facies articularis ossis temporalis. In addition a hypothesis is established according to which the temporomandibular-joint-luxation may be considered to occur in the menisco-condylar part of the joint.

[Stable osteosynthesis in mandibular fractures using cold polymerizing polymethylmethacrylate "Kallocryl-K"].

The author describes a method for the stable osteosynthesis of mandibular fractures. Prefabricated cups of cold-curing poly(methylmethacrylate) were fixed to the fragments by means of freshly mixed methacrylate, which produced their stable union for the period of healing. Uneventful healing was confirmed by clinical and radiological examinations.

[Studies on the diffusion of the remaining monomers from implantation plastics of polymethacylic acid methylester].

Positive clinical results were obtained using implanted cold polymerizates, and these were compared with the negative results of experiments made on animals. The observed local pathophysiological processes are considered to be due to the effects produced by the methacrylic methyl ester. The absolute content of residual monomers in the implants does not allow to make any definite conclusions as to the rate of diffusion into the organism.

[Characterization and determination of residual monomer content of implantation materials from polymethacrylic acid methylester].

Cold polymerizates "Kallocryl K" and "Palacos" were characterized by means of physico-chemical methods of examination. The residual monomer content of the polymerizates, which is of major toxicological interest, was also determined quantitatively. It was possible to show that the residual monomer content decreases exponentially as a function of the duration of polymerization.

[Histological studies on the healing of mandibular osteotomies in the dog following stable osteosynthesis with the cold polymerizing polymethylmethacrylate "Kallokryl K"].

The disadvantages of methods of accomplishing stable osteosynthesis of mandibular fractures are described and the possibilities of jacketing the fragments with Kallokryl K plastic material, which is a cold-polymerizing polymethyl methacrylate, pointed out. After six months from the surgical operation, the healing under Kallokryl K was clinically and histologically evaluated on canine mandibles subjected to osteotomy and with the periosteum removed from the lower jaw bone. The reaction of both soft tissue and bone to the plastic material attached thereto was also evaluated.