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Biomedical subjects

J Lavigne

Publications and source records attributed to J Lavigne.

12 recordsLinked to original sources
PubMed1991

Nuclear matrix protein mitotin messenger RNA is expressed at constant levels during the cell cycle.

During the course of an investigation on nuclear matrix protein cDNAs, we have isolated a cDNA clone hybridizing with the messenger RNA encoding mitotin. Mitotin is a 125 kDa/pI 6.5 nuclear matrix protein present in proliferating but not in resting cells. This protein was shown to have a marked increase and characteristic redistribution in G2/M phase of the cell cycle. In this report, using synchronized Raji and WISH cells, we demonstrate that mitotin messenger RNA is expressed at the same level throughout the cell cycle.

Blotting, Northern↗
PubMed1979

[Presentation of a universal face-bow].

A universal face bow is reported for transferring an arbitary or located hinge axis on most articulators. Its use is simple and safe due to the rigidity of the assemblies during every step of the transfer.

Dental Articulators↗
PubMed1979

[A new modular semi-adaptable articulator].

A new semi-adjustable Arcon articulator is reported. It is an evolutive device that can be set with two different types of condylar housings. - A Type: adjustable condylar guidance, preadjusted Bennett angle at 13 degrees - B Type: adjustable condylar guidance, adjustable Bennett angle. It is possible to set on this B type fossa assembly another Bennett wing with an adjustable immediate side shift This device has a double lock in centric relation and may be set with an arbitrary or localized hinge axis.

Dental Articulators↗
PubMed1978

[The centric relation. IV. Variations in condylar positions according to the methods of measuring centric relation and to the patient's clinical type].

When recording and transferring centric relation onto an articulator errors can be minimized by proper use of dental materials. Remaining errors may be due to either the patient or the clinician. 3 recording techniques (Lucia, Dawson, Ramfjord) are being tested by 2 operators on 12 patients. In order to get a proper centric relation one must not rely upon a technique of taking it but rather on an adequate clinical evaluation of the TMJ at that moment. The role of inadequate intermaxillary relationship upon painful TMJ syndroms cannot be underestimate.

Adult↗
PubMed1977

Specific inhibition of the incorporation of tritiated thymidine in regenerating rat liver by a rat hepatocytes supernatant.

Studies on endogenous inhibitors obtained from supernatant fluids of rat hepatocytes indicated that the supernatant arrests the normal cell cycle at two points, namely, before the beginning of the S phase and at the onset of metaphase when assayed in regenerating liver cells in situ. The specificity of this (these) inhibitory substance(s) was evidenced by the finding that no inhibition of cell division was observed in situ in tongue, intestine, or kidneys of animals injected with concentrations of the hepatocyte supernatant that inhibited cell division in regenerating liver. When higher concentrations of the inhibitor-containing supernatant were used, only the tongue epithelial cells were affected in addition to the regenerating liver cells.

Albumins↗
PubMed1975

[The centric relation. I. Contribution to the study of the reliability of 3 materials for interocclusal registration].

Three materials commonly used for interocclusal registrations are tested under habitual conditions. The wax-type samples are softened in hot water to the optimal temperature, and then cooled off for hardening either in ice water, or room temperature water, or at room temperature air. These materials are stored for one month. Measurements are taken: - prior to any treatment - after hardening - after storage. The results are statistically analyzed. The least distorsion of material is obtained with the softer wax and vice versa. The room temperature air cooling has given best results. Time does not seem to modify measurements made on heat treated materials which may be accurately stored at room temperature.

Dental Impression Materials↗
PubMed1975

[The Centric relation. II. Volumetric variations during the mounting of models on the articulator].

When mounting models on the articulator there is some possibility of error due to the expansion of plaster during the setting period. If one does not pay attention to this expansion, one can observe an opening in between the arms of the articulator. In order to minimize expansion one must: -- increase the W/P ratio -- decrease the amount of plaster used for mounting the models The expansion modifies the reference plane and this is important only in case of remountings.

Dental Materials↗