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Biomedical subjects

J Poulard

Publications and source records attributed to J Poulard.

At least 19 recordsLinked to original sources
PubMed1991

Dentinal permeability of the dog canine after exposure of a cervical cavity to the beam of a CO2 laser.

The dentinal permeability of the axial wall of a class V cavities in the canine of the dog was analyzed before and after its laser CO2 irradiation at two energy levels: 285 J per cm2 and 570 J per cm2. The sealing of the exposed dentin was verified by means of a pellet of cotton wool placed in contact with the axial wall and on which 20 microliters of a 50 mg per ml solution of noradrenaline was injected with a micrometric syringe. The transdentinal passage of noradrenaline induces a vasoconstriction of the pulp which is attested by a drop in its blood pressure. The absence of any variation in the pulpal pressure is an indication of the sealing to noradrenaline of the dentinal wall irradiated with an energy level of 570 J per cm2. This experimentation illustrates that it is possible to obtain dentinal sealing by means of laser irradiation without affecting the underlying pulp. The quality of this reduction in permeability is dependent upon the different factors which define the energy level.

Animals↗
PubMed1991

[Effect of local anesthetics on the dental pulp. Study in rats].

According to the in vitro and in vivo procedures described by Rockert and Pracros, the effect of different local anesthetics (with and without vaso-constrictive solution) have been studied on rat incisor dental pulp. Histological analysis (optical microscopy) of samples (90 rat incisors) showed: A systematic pulp response with concentrations up to 2%. This response correspond with a toxic reaction on the respiratory activity of pulp cells; A highest response with solutions containing a vaso-constrictor additive; An increasing response according to the nature of the anesthetic solution.

4-Aminobenzoic Acid↗
PubMed1990

[Diffusion of elements of glass ionomer cements placed in a dentin cavity: influence on pulp pressure].

The biocompatibility of glass ionomer cement with silver and titanium ions is studied in vivo on dog's canine. Class V cavities, side by side the pulp, are prepared and Ketak Silver cement is placed inside. Variation of pulp pressure are recorded before and after the cement's applying, after which the crowns are cut and broken at the filling level, the different components part diffusion through the dentin are placed in prominent position by means of a microanalysis and a cartography of the sample is obtained by colorimetric picture. The pulp's haemodynamic responses to Ketak Silver are in harmony with the metallic ions diffusion and specially with silver.

Animals↗
PubMed1990

[Experimental study of the effect of a photopolymerizable glass ionomer cavity liner on pulp pressure and temperature].

The biocompatibility of a light curing glass ionomer cement was studied for its pulpal effect when used as a capping agent in a dentin cavity. Pulpal pressure and temperature were recorded in 14 dog canines after placement of the glass ionomer cement. No increase was observed in 12 specimens on 14 samples. These results indicate that no pulpal effect can be demonstrated when using Vitrabond as a dentin capping agent.

Animals↗
PubMed1979

[Vasomotor innervation of the maxillary canines of the dog].

Maxillary canine pulpar pressure was recorded on anesthetized dogs by means of a small bore cannula threaded into a hole drilled through the lateral surface of the tooth. Vasoconstriction was brought by the electrical stimulation of the cranial cervical ganglion. Vasodilation was induced by stilmulation of the pterygo-palatine ganglion. This vasodilation was inhibited by atropine. Most often, constrictor fibres follow the course of the pterygo-palatine nerve, when dilator fibres follow the infraorbital nerve. However, both sorts of fibres may be found in the infraorbital nerve.

Animals↗
PubMed1976

[Methods of determination of fluoride in trace amounts. Application to the study of the diffusion of fluoride from an amalgam in dental tissues].

The study of fluoride diffusion in dental tissues has been performed by microprobe analysis. The fluoride supply is carried out in vivo by various fluorides added to conventional amalgams. This method differs then from previous work (topical applications, electrophoresis or fluoride solutions) by the study of fluoride penetration from amalgams either in dentine or in deep enamel, which are more susceptible to caries than superficial enamel. These experiments give evidence of a fast penetration of fluoride into dental tissues, which may be characterized by an apparent diffusion coefficient of about 10(-10) cm2/s.

Dental Amalgam↗