The enamel-cementum junction represents an unique place on the dental surface, where the three hard tissues can occur under at least 4 types of ratios, and on which, in the young adult, the dento-gingival ligaments of the covering parodontium are inserted.Usually, the clinical and therapeutical implications of the morphology of the enamel-cementum junction are neglected in routine stomatological therapy. The present study aims at identifying and evaluating – through scanning electronic microscopy – the types of enamel-cementum junctions analyzed in a group of 64 teeth with intact cervical area, extracted from orthodontic and periodontal reasons. In the frontal area, an enamel-cementum juxta-ratio is most frequently occurring, in the canines a dentine band being interposed among the supradjacent tissues, which is even more common on the vestibular and oral surfaces. In the lateral area, most frequently the cementum covers the enamel, while the vestibular and oral surfaces show no instances of enamel-cementum non-coalescence. No areas of uncovered dentine could be noticed on the vestibular and oral surfaces of the mandibulary teeth, the most frequently met ratio being that in which the cementum covers the enamel. The higher frequency of the areas of uncovered dentine at cervical level, between enamel and cementum, especially in the maxillary canines, represent an alarm signal, as this is a fragile region, intensively predisposed to physiological modifications induced by age, but also to pathological modifications, which require
special protection and management, even during routine therapeutical actions.