[Importance of apical instrumentation limit in the endodontic technique].

An improved knowledge of anatomy and psysiology of the apical radicular region has made mandatory a better classical endodontic technique concerning the apical limit of instrumentation, and has stressed the importance of a precise determination of the cemento-dentinal junction as the apical limit of canal obturation. On the basis of these orientations a clinical and radiographic study was carried out on 120 teeth extracted form humans, in which the frequency was determined of the excentric position of the cement conus with regard to the apex, and the distance between the cemento-dentinal junction and the apex. In 45 teeth in situ, with pulpar inflammation, gangrene and apical parodontitis a clinical and radiological appraisal was done of the cemento-dentinal junction, and evolution was followed after canal obturation.

[Treatment of chronic marginal parodontopathy].

Complex parodontal therapy is the main object of interest in the field of specialized assistance provided by our group. Between 1971 and 1987 complex parodontal therapy was applied in a total of 616 patients, of which 150 between 1971 and 1975, 174 between 1976 and 1980, and 292 between 1981 and 1987. Therapy consisted in individualized procedures depending on general and local conditions, and was aimed at the control of the bacterial plaque, extraction of irrecuperable teeth, removal of the dental pulp when significant polishing had to be carried out for alignment in the occluding plane, and of prosthetic parallelism in pluriradicular teeth with involvement of the furcation (II-nd and III-rd degree) where radicular amputation was necessary, hemi- or bisection.