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Biomedical subjects

R Marguelles-Bonnet

Publications and source records attributed to R Marguelles-Bonnet.

17 recordsLinked to original sources
PubMed1998

MR of 732 TMJs: anterior, rotational, partial and sideways disc displacements.

OBJECTIVE: The purpose of this study was to determine the prevalence of anterior, sideways, rotational and partial anterior disc displacements, as well as degenerative changes in patients with clinical signs and symptoms of internal disorders. MATERIALS AND METHODS: 732 MR Images of temporomandibular joints (TMJ) were produced for 366 symptomatic patients. Image analysis included assessment of disc positions and mobility, as well as recapture in coronal and mediolaterally divided sagittal planes in closed and open positions. RESULTS: Of these images, 545 TMJ showed an internal derangement comprised of 52% anterior disc displacements without reduction, 26% anterior disc displacements with reduction, 11% partial anterior disc displacement, 5% pure sideways displacements and 4% stuck discs. Rotational disc displacements were observed in 34% of the anterior disc displacements without reduction group and in 53% of the anterior disc displacements with reduction group. A total of 97% of the partial anterior disc displacement occurred laterally. Degenerative changes increased with age, mainly in the anterior disc displacements without reduction group. CONCLUSION: Magnetic resonance imaging (MRI) investigations show that the disc is subject to a great variety of displacements and that there is a need for further research to refine the clinical therapy for TMJ internal derangements.

Adolescent↗
PubMed1993

Disc movements over the condylar head. Radiographical study on autopsy materials.

A radiographical study has been performed to evaluate the movement of the disc posterior band over the condylar head during mandibular opening. Six formal free embalmed subjects were selected as 'normal'. Micro stainless steel balls were used as landmarks both into the bone and into the disc for X-ray identification. The data was processed at each phase of movement in selected planes. The true coordinates of each disc landmark gave the potential to calculate the linear length of their path and any distance change between them. It can be concluded that there is a 5% width reduction during the opening movement and it also suggests strongly that a fair amount of translation movement between the disc and the condyle occurs in the lower compartment.

Cadaver↗
PubMed1990

Anatomy of the temporomandibular joint and related structures in the frontal plane.

Conclusions about the anatomy and physiology of the temporomandibular joint have too often been based on sagittal representations. The aim of the article is to describe frontal serial cuts of an acrylic embedded articulation of a subject with teeth in intercuspal position. The frontal plane is best to visualise the difference between lateral and medial aspects of structures such as the disk-condyle-complex, the articular capsule, and related muscles.

Dental Occlusion, Centric↗
PubMed1989

Temporomandibular joint serial sections made with mandible in intercuspal position.

This article presents a method for preparing block sections of the human temporomandibular joint. The purpose of the study was to examine the relationship of the temporomandibular joint components without disturbing the anatomic arrangement of the parts. The mandibles of seven fresh cadavers were locked into a specific occlusal position (intercuspal) throughout all procedures. An acrylic embedding technique allowed serial sections in any plane without displacement or tearing of mineralized and soft tissues. Photographs were obtained using an Olympus transmitted light microscope with various magnifications from 1 X to 40 X.

Adult↗
PubMed1988

Insertions of the lateral pterygoid muscle: an anatomic study of the human temporomandibular joint.

The objective of this investigation was to evaluate the anatomic relationships of the lateral pterygoid muscle with the disc-condyle complex using an acrylic embedding technique to obtain anatomic serial cuts of a solid block containing the temporomandibular joint (TMJ) and the neighboring structures. The fibers of the upper and lower heads were found to be fused in front of the TMJ and to constitute medially a strong muscular wall. The lateral third of the anterior band of the disc was free of any muscle insertions and related anteriorly with loose connective tissue; the middle third showed fibers that run under the anterior band of the disc and attached in the upper part of the condylar fovea. Only the medial portion demonstrated both fibers running into the disc and fibers inserting into the bone. The fibers inserted into the bone run under those attached into the disc and terminated below the medial pole of the condyle binding the disc tightly over the medial pole. This study demonstrates that the main insertions of the superior head are not into the disc but into the condyle. Considering the anatomic organization of the upper head, the explanation of anterior displacement of the disc due to a spastic activity of this muscle alone is not probable. Hypotonicity, not hyperactivity, of the upper head may contribute to an anterior and medial disc displacement.

Dissection↗