Teenage luxation injury: report of case.

The endodontic, restorative, and orthodontic treatment sequence of the accidental injury of three maxillary incisors has been presented. The treatment objective was to achieve an esthetically acceptable result for a young adult, until a definitive fixed prosthetic restoration can be planned. The ankylosed maxillary right permanent central incisor (11) is being maintained for reasons of arch-length space and alveolar bone height.

[Fissure caries: the correlation of clinical and radiological data]. / Caries de fissures: corrélation des données cliniques et radiologiques.

The goal of this research was to evaluate the conventional means of clinical (mirror and probe examination) and radiological diagnosis (bitewing radiographs) of occlusal caries of first permanent molars during the post eruptive period. These teeth showed colored or non-colored fissures, and none of them had conservative or preventive obturations, or dentinal caries. Four experienced dentists independently evaluated the trials, diagnosed the lesions and advised a treatment. The effective lesions were shown by opening minimal preventive cavities, which were then obturated with amalgam. The results showed the lack of precision for the early diagnostic means of initial pit- and fissures-caries, and differences and errors of evaluation performed by the dental professional with respect to their diagnosis and proposed therapeutic choice. The effective lesions demonstrated the high incidence of pit- and fissure-caries in permanent molars during the post eruptive period.

[Action of a CO2 laser on dental tissues]. / Effets du laser à CO2 sur les tissus dentaires.

In order to investigate the effect of a CO2 laser on dental tissues, 51 healthy human teeth were lased and prepared for macroscopic, histological and SEM examination using standardized methods. The alterations induced by the thermic shock varied according to the tissue's composition and the lasing's intensity. The effects generally appeared as cracks with fragmentation of the superficial enamel, and a carbonization of the cavity. The underlying pulp showed a disintegration of the odontoblastic layer and an oedema, the severity of which depended on the residual dentinal thickness and the lasing's intensity. The study's results, divergent from those often found promising in the abundant literature, bring to light the biological incompatibility of this type of hard laser regarding the dental organ and suggest caution concerning eventual therapeutic indications.