Revue francaise d'endodontie : publication officielle de la Societe francaise d'endodontie最新文献

The use of chelation in endodontics demands a knowledge of the workings of its physico-chemical process. To explain this, we must define unsaturated salts and contrast them with the complexes to which the chelates belong. A few examples of application illustrate these different properties especially the action of E.D.T.A. on the calcified tissues of the endodontium. The mode of action of liquid E.D.T.A. or chelating gels in calcified root canals, poses several questions. The varied studies realized in this domaine allow us to affirm the usefulness of E.D.T.A. in root canal disinfection and in opening up lateral and accessory canals. Also, we must consider the possible influence of chelating agents on the apical seal when the permanent root filling is post poned, and their role in changing the permeability of dentine.

Intraligamentary anesthesia is widely used both as a primary and a supplemental injection technique. The purpose of this review of the literature is to answer questions one may ask about the technique, its efficacy, anesthetic solutions, postinjection discomfort, distribution of the injected solutions, systemic effects and pulpal and periodontal tissue response.

A clinical study involving 25 patients and a total number of 42 canals was carried out in the department of Endodontics at the Saint-Joseph University of Beirut and in private practice. The use of the Thermafil device seems to be safe due to the carrier manufactured with a stainless steel medical grade, covered with a layer of gutta-percha alpha phase. The clinical results are satisfactory, the technique is simple, fast and efficient, which confirms the results published in the literature. More investigations are necessary to a better evaluation of the system.

The instrumentation and filling of teeth with curved canals are always difficult, therefore, the current study indicates solutions to problems encountered while preparing curved canals. The gutta condensation techniques and their ability to seal curved canals are also discussed. This study uses endodontic simulators to show the incidence of protocols and instrumentation on the ability of the lateral condensation technique to fill curved canals. This study, also, evaluate the lateral condensation technique combined with the thermomechanical in filling curved canals.

Lateral canals are frequently endo-periodontal pathways. Filling lateral canals is not always necessary for a successful root canal treatment. Endo-perio lesions are bacterial in origin and lateral canals filling is only necessary when there is a chance for bacterial contamination: pulpal necroses, and deep periodontal pockets surrounding a lateral canal.

The aim of the work was to evaluate the bone density of chronic periapical lesions in the area of maxillary incisors and canines. Twenty-six radiographies were made in a systematic way in patients with periapical lesions and were valued using densitometry (0-256), the grey levels by computer and the analysis program image (IBAS 2000 Kontron, Germany), taking four values in each periapical lesion from the center to the periphery within the same radiography, by using the pseudocolor to identify the four areas, always in the same coloration. Correlation was proved with significative statistically results between lower densitometric values and osteolysis and radiolucency areas.

Numerous authors have produced different types of immunoglobulins in analyses of the human periapical granuloma. The present study examines the cellular immunity of the human periapical granuloma, and in particular the distribution of the lymphocyte sub-populations and the macrophage population. The technique used was that of cell surface marking, using monoclonal antibodies on frozen sections. The results reveal equal proportions of inductor T lymphocytes and suppressor T lymphocytes (whereas healthy tissue shows a ratio of 2/1), which explains the chronic nature of the lesion as far as the immune reaction is concerned. The presence of numerous macrophage cells shows that there are important local immune reactions.

Two electronic root canal length measuring instruments were used to measure the working length to "the apex" in 88 teeth scheduled for extraction. After extraction, the canal length was measured using X-Ray and microscopic observation after section of the teeth. The accuracy of the RCM apex locator in determining canal measurement within +/- 0.5 mm from the apical foramen varied around 62%. The "NO'X" allows a success rate of 41% in the same conditions. The conditions of this experiment shows that electronic root-canal length measuring instruments do not work in case of hemorrhage or swelling.