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Biomedical subjects

R Elbaum

Publications and source records attributed to R Elbaum.

10 recordsLinked to original sources
PubMed2006

Dentin micro-architecture using harmonic generation microscopy.

OBJECTIVES: We present a novel way to create high-resolution three-dimensional images of tooth dentin by harmonic generation scanning laser microscopy. METHODS: The images were taken using a pulsed infrared laser. Three-dimensional reconstruction enables the visualization of individual tubules and the collagen fibrils mesh around them with an optical resolution of approximately 1 microm. RESULTS: The images show micro-morphological details of the dentinal tubules as well as the collagen fibrils at a depth of up to about 200 microm. The data show that while collagen fibrils are organized in planes perpendicular to the tubules, close to the dentin enamel junction they lie also along the long axis of the tubules. CONCLUSIONS: The unique 3D information opens the opportunity to study the collagen fibril arrangement in relation to the tubule orientation within the dentin matrix, and may be applied to study the micro-morphology of normal versus altered dentin.

Animals↗
PubMed1999

[A case of isolated avulsion fracture of the posterior cruciate ligament in a child].

PURPOSE OF THE STUDY: The authors report one case of isolated avulsion fracture of the tibial attachment of the posterior cruciate ligament. They recommend the use of 3D CT Scan to appreciate the size, the displacement of the bone fragment or the occurrence of comminuted fracture. MATERIAL AND METHOD: A 12 years old girl was admitted for knee pain and swelling secondary to horse's hoof blow on the anterior aspect of the proximal tibia. Hemarthrosis, contusion of the anterior surface of the proximal tibia were present. Because of pain and swelling, the knee could not be examined with accuracy. Roentgenographic examination showed isolated avulsion fracture of the tibial attachment of the posterior cruciate ligament. 3D CT Scan confirmed the lesion. Bony fragment was displaced and was not comminuted. Approach through the popliteal fossa was used and bony fragment was screwed back into its bed. RESULTS: Postoperatively, a long leg plaster of Paris was applied for 6 weeks. The patient was followed for 1.5 year. She returned to her previous occupation. There was no residual laxity. X ray confirmed fracture union. DISCUSSION: Results of primary repair of interstitial posterior cruciate ligament tears were inconsistent. On the contrary, good functional results were obtained with surgically treated avulsion fracture of the posterior cruciate ligament. Displaced bony fragment will be fixed properly to its bed. 3D CT Scan appreciate the size, the displacement or the occurrence of comminuted fracture. Those informations help to define surgical procedure: screw, wire-suture or staple.

Child↗
PubMed1994

[Traumatic scapulo-humeral dislocation in children and adolescents. Apropos of 9 patients].

From 1974 to 1989, 9 children or adolescents, with an average age of 12 years and 4 months were seen for traumatic dislocation of the shoulder. All patients were followed for a minimal period of 2 years following the primary dislocation. Six patients were treated with closed reduction and immobilization for 3 weeks followed by a rehabilitation program. The recurrence rate was 71%. The authors insist on the fact that traumatic glenohumeral dislocation is a rare pathology in pediatric traumatology. The recurrence rate following the initial episode is higher however than for the adult population. These patients should be followed until consolidation of their lesions.

Adolescent↗
PubMed1992

Biocompatibility of an enamel-dentin adhesive.

To assess the biocompatibility of a third-generation dentinal adhesive that uses a smear layer conditioner (Scotchbond 2), Class V cavities were prepared and restored in vivo, following a standardized protocol, in 32 human premolars to be extracted for orthodontic reasons. Histologic observation showed seven slight, five moderate, and one severe reaction short term, while 11 slight and three moderate reactions were observed long term. It appeared that the intensity of the reactions decreased with time. Bacteria were observed on only five teeth, and no correlation could be established between the presence of bacteria and the intensity of the reactions. It seemed that the conditioning of the smear layer, although it might have rendered the residual dentin more permeable, limited percolation phenomena by increasing adhesion. Although only one severe reaction was observed, it is mandatory in a clinical setting to place a protective lining near the pulp.

Biocompatible Materials↗
PubMed1991

A histologic study of the biocompatibility of a dentinal bonding system.

To assess the biocompatibility of an adhesive system, standard Class V cavities were prepared in vivo in human premolars that were to be extracted for orthodontic purposes. Histologic observation revealed that the Gluma Bond System elicited slight to severe pulpal responses, altered odontoblastic layers, and inhibited dentinogenesis. These alterations were observed after in vivo periods of up to 120 days. In this experiment, the dentinal adhesive was polymerized separately from the composite resin, a procedure not recommended by the manufacturer. This may explain the differences in the present results and those reported by the manufacturer.

Adolescent↗
PubMedDate not supplied

Radial club hand and Holt-Oram syndrome.

The authors describe the case of a young African girl born with a radial club hand associated with a pedicled floating thumb, no other orthopaedic malformation was detected. A ventricular septal defect necessitated surgery in emergency. In front of such malformative association, the Holt-Oram syndrome has been evoked. The aim of this study has been to review the etiology and classification of this rather rare malformative association, as well as to describe the therapeutic attitudes and surgical techniques proposed by various authors towards the radial club hand (1, 3, 5, 6, 7, 12).

Cardiac Catheterization↗