Journal d'odontologie conservatrice最新文献

Six hundred sixty nine human mandibular first and second premolars were collected (extracted) and studied. We made roentgenographic studies, sections of extracted teeth. Comparisons with the findings of other investigators were made in regard to the number of roots and number of root canals (in different tables).

At the present time, the research in and the utilization of magnetic resonance imaging in odontostomatology remains limited. It appeared interesting to access the advances made in this technic and to attempt an evaluation of the longrange perspectives of MRI in this field. In order to more clearly understand the images produced by this technic, the principles of nuclear magnetic resonance are summarized, followed by an account of the principle applications with respect to the buccal cavity and the temporo-mandibular joints. Studies showing the influence of different alloys used in dentistry on the quality of the nuclear magnetic images remain for the moment, rather limited. MRI of the oropharyneal area permits a glimpse of interesting perspectives such as the detection of tumorous lesions or the visualization of meniscus of the TMJ. Nevertheless, three factors constitute considerable obstacles in the broad utilization of MRI in the field of odontostomatology: the time lapse of image production, the relatively limited special resolution and finally the prohibitive cost of examinations.

Complementary to the didactic lecture, the guided teaching system enables the students to formulate and resolve one or more problematic cases specific to the topic. The application of the PHILIPS 6/6 inter-active non-directive method, allowed us through the teaching of a simple subject (the rubber dam in restorative dentistry) to emphasize the multiple performances of group dynamics as applied to dental education.

The purpose of the work is to study primary and recurrent caries through an epidemiological inquiry on the bucco-dental state of dental students at the University of Bordeaux II from 1986 to 1988. The first part describes the sample with mean and standard deviation; then histograms are constructed for each parameter with mean and median. A second, analytical part allows the study of the influence of time and research of risk factors and associated ones of primary and secondary caries, and evidence of a linear relationship between dental caries and quantitative factors. The last, prospective part leads to quantification of predictive value of risk factors with the calculation of sensitivity, specitivity and conditional probability. Results statistically show that risk factors predispose to dental caries and their recurrence for alpha = 10%. They, consequently, confirm particularity of the population about hygiene, treatment motivation and show trends to sugared food consumption, hygiene, salivary ph, yet setting the problem of sample representativity.

Four embedding media were compared: paraffin, the mixing "paraplast-piccolyte", Technovit 7100, and JB 4. Each material embedding technic is described. Comparison criteria are: easiness in the technic and method, cutting and trimming qualities, staining, anatomy connections conservation. Results are compacted in a diagram and illustrated by microphotographs. Methacrylate resins, and particularly JB 4, gave us best results.

Faced to the major role of the patients examination as a part of our interventions in dentistry, and with to our pedagogic mission towards students, we propose a method of interviewing the patients based on the principle of reformulation, basic technique in the help-talk. The described experimentation demonstrates the interest of method compared with the classical "interrogatory", particularly with rebellious or "problematic" patients. The personalized interview is efficient in obtaining their cooperation which is a key factor for the subsequent treatment.

The fluorescence is a photoluminescent phenomena consisting in the emission of light under the influence of a light wave excitation. Two types of fluorescence exist: the primary fluorescence (natural) and the secondary (induced by a fluorochrome) The fluoromicroscope is composed of two parts. One of which, unspecific, consists in the classical optical system of the photonic microscopy. The other part, specific, consists in a source of light at a high mercurial pressure and a double filtration system of excitation and pause. There are many applications of this technique. In odontology, it is frequently used for the study of apposition in calcified tissues after their labelling by injection of a fluorochrome.

We determined the chemical composition, confirmed on X-ray diffraction analysis, of 10 brand commercially available dental gutta-percha cones. We observed a great chemical heterogeneity among gutta-percha cones of different origin as well as within the same brand between small and large sizes.