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Biomedical subjects

J L Coudert

Publications and source records attributed to J L Coudert.

16 recordsLinked to original sources
PubMed1992

Disturbances caused by dental materials in magnetic resonance imaging.

Nuclear Magnetic Resonance (NMR) is the latest addition to medical imaging technology. This technique plays an important role in head and neck diagnosis. Radiologists may encounter patients with fixed dental prostheses that may produce image distortion on MRI scans of the face. The MRI appearances of dental prosthetic materials was studied in vitro, including precious alloys, non-precious alloys, ceramic prostheses, dental amalgam and composite materials. It was found that non-precious alloys produce large image deformations, whereas precious alloys had no effect on MRI images. An in vivo study showed the anatomical zones that were most affected on MRI scans.

Ceramics↗
PubMed1992

[Evaluation of the orofacial and dental status of a population of leprosy patients treated with multidrug therapy in Senegal].

The orofacial lesions of untreated leprosy have long been known. Our study concentrated on the bucco-dental and facial status of 97 leprosy patients given multidrug therapy. The number of decayed teeth and of teeth missing due to extraction proved high. Clinical manifestations of leprosy in the facial region are, however, rare and lesions of the oral mucosa, while more frequent, always exhibit scarring.

Adolescent↗
PubMed1991

Dental materials and magnetic resonance imaging.

Radiologists may encounter patients with fixed dental prostheses that may produce image distortion on MRI scans of the face and jaw. In this work, we assessed the MRI appearances of dental prosthetic materials in vitro, including precious alloys, nonprecious alloys, ceramic prostheses, dental amalgam, and composite materials. For in vivo studies, these materials were placed in the patient's mouth. Nonprecious alloys produce large image deformations, whereas precious alloys had no effect on MRI images. The in vivo study showed the anatomical zones that were most affected on MRI scans. The size of these zones produced by the presence of nonprecious alloys is influenced by the volume of the prosthesis and is related to the scanning sequence used.

Adult↗
PubMed1990

Radioisotopic and biochemical determination of salivary secretion after long term psychotropic therapy.

The aim of this work was to investigate the effect of prolonged psychotropic therapy (neuroleptics and antidepressants over 5 yr on salivary secretion. The flow rate in the parotid and submandibular glands were measured separately by scintigraphy. Flow rates, total protein concentration and total IgA level were determined in the unstimulated saliva in 30 control subjects and 73 patients treated with psychotropic drugs. As evidenced by measurement of flow rates and scintigraphy, psychotropic therapy reduced the unstimulated salivary secretion from parotid glands and to a lesser extent from submandibular gland. The scintigraphic study showed a lower response to stimulation in patients than controls.

Humans↗
PubMed1989

Preliminary results of nuclear magnetic resonance studies of healthy human saliva.

Relaxation times T1 and T2 of water protons for stimulated and unstimulated parotid and submandibular saliva from healthy patients were measured in the conventional way using the Bruker PC 20 Minispec. Some measurements of dispersion were also carried out. An interpretation of the average values for T1 and T2 observed in the 20 MHz range is proposed for these types of saliva in relation to biochemical composition (total proteins, amylase activity, sialic acids and hexosamins) and viscosity. For parotid saliva T2(-1)-T1(-1) correlates significantly with amylase activity. In the submandibular saliva T2(-1)-T1(-1) correlates significantly with both mucins and alpha-amylase activity.

Amylases↗
PubMed1983

[Sialitis].

Explore the source record for details and available documents.

Aged↗
PubMed1979

[Pathogenesis of reflex secretory dysfunctions. Value of isotopic techniques (author's transl)].

Many hypotheses have been advanced to try to explain the mechanism involved in reflex secretory dysfunctions. The use of dynamic isotopic techniques and their application in clinical research enable a more precise approach to be made to assist in solving the problem. Using several examples of dysfunction of various etiologies, the authors demonstrate the existence of an excretory blocking effect from parasympathetic inhibition.

Atropine↗