[Comparative study of Agfa-Gavaert, Kodak Ultra-Speed and Kodak Ektaspeed dental radiographic films, processed in Sillib solution]. / Estudo comparativo entre os filmes radiográficos dentais Agfa-Gevaert, Kodak Ultra-Speed e Kodak Ektaspeed, processados na solução Sillib.

The films were compared through their characteristic curves obtained in experimental conditions and processed in Sillib's developers. Radiographies of a phanton, obtained in standard conditions of exposure and development, were analysed by dentists and technicians for judgement. It was possible to conclude that as long as the recommendations of films and developers manufactures are followed, the results are acceptable for dental clinical work, when these films were processed in Sillib's solution (20 degrees C/2 min). The judges preferred those which received two times the recommended exposure.

[Radiographic study of the applicability of three anatomical landmarks in transcranial radiography of the temporomandibular joint]. / Estudo radiográfico da aplicabilidade de três pontos de reparo anatômicos nas radiografias transcranianas da articulação temporomandibular.

The variability of the angles formed between the long axis of the right and left condyles and the midsagittal plane, as well as the applicability of three anatomic landmarks--zigoma, gonion and base of the mandible, for transcranian radiographs of the TMJ were studied. The radiographic method used in this study was the HIRTZ axial projection. The results of the measurements showed a great variation in the angle formed by the long axis of the condyles and the midsagittal plane, from 48 degrees-79 degrees (x = 63.73 degrees) for the right side, from 50 degrees-80 degrees (x = 67.43 degrees) for the left side. It was also observed that the use of the three anatomic landmarks must not be generalized, being more precisely indicated for tapering head and face.