Alcebíades Nunes Barbosa

Avaliação clínica de reabsorção radicular externa em dentes desvitalizados submetidos ao clareamento

The purpose of this study was to evaluate the presence of external resorption in non-vital teeth submitted to bleaching. The evaluated patients had at least one non-vital tooth, which had been bleached between 1986 and 1996. All teeth were submitted to bleaching with hydrogen peroxide and sodium perborate, as described by Busato et al.5,6. From 193 patients recalled for clinical and radiographic evaluation of bleached teeth, only 43 attended (54 teeth). The average time elapsed after bleaching was 3.5 years. The results revealed that none of the examined teeth had any degree of external cervical resorption.

Correlation between visual and radiographic examinations of non-cavitated occlusal caries lesions: an in vivo study

O presente estudo verificou in vivo a correlacao existente entre os sistemas de escore visual e radiografico de Ekstrand et al.7 (1997) para diagnostico de lesoes de carie oclusal. A amostra do estudo foi constituida de 147 sitios oclusais obtidos a partir de 23 pacientes. Os exames clinicos visuais foram realizados por dois examinadores treinados e calibrados. A analise das radiografias interproximais foi realizada por um terceiro examinador tambem treinado e calibrado, que desconhecia os resultados do exame clinico visual. A correlacao entre os escores visual e radiografico foi avaliada por meio do coeficiente de correlacao gamma de Goodman & Kruskal. Os resultados revelaram uma forte correlacao existente entre os escores dos sistemas de diagnostico visual e radiografico de carie oclusal adotados no presente estudo.The aim of this study was to conduct an in vivo investigation of the correlation between the visual and radiographic scoring systems by Ekstrand et al.7 (1997) for the diagnosis of occlusal caries lesions. The study sample comprised 147 occlusal sites from 23 patients. Two trained and experienced examiners performed the clinical visual examinations. A third examiner, which was also trained, experienced and blind to the results of the visual clinical examination, performed the analysis of the bitewing radiographs. The correlation between visual and radiographic scores was assessed by Goodman & Kruskals gamma correlation coefficient. Results showed a strong correlation between the scores for occlusal caries found in the visual and radiographic diagnosis systems used in this study.

Efeito da intensidade de luz, distância e tempo de fotoativação sobre a interface esmalte-resina composta - análise por microscopia eletrônica de varredura

The aim of this study was to analyze the marginal adaptation in enamel / composite resin interface by scanning electronic microscopy when varying light intensity, distance and light curing time of the material. Twelve teeth were used for preparing forty-eight cavities (2,2 mm diameter x 4 mm deep) in buccal, lingual, mesial and distal surface). The cavities were restored applying a nanofilled resin (SupremeTM, 3M-ESPE) in a single layer, and cured by the following variables: 180 or 580 mW.cm-2, 20 or 40 seconds of irradiation time, 0 mm or 8 mm of distance. The groups were described as: G1 - 20s x 180 mW.cm-2 x 0 mm; G2 - 40s x 180 mW.cm-2 x 0 mm; G3 - 20s x 580 mW.cm-2 x 0 mm; G4 - 40s x 580 mW.cm-2 x 0 mm; G5 - 20s x 180 mW.cm-2 x 8 mm; G6 - 40s x 180 mW.cm-2 x 8 mm; G7 - 20s x 580 mW.cm-2 x 8 mm; G8 - 40s x 580 mW.cm-2 x 8 mm. The restorations were prepared for SEM evaluation intending to analyze enamel / composite resin interface. The results were submitted to Kruskal-Wallis analysis (α = 0,05). Groups 1, 2, 5 and 6 showed better marginal fitting when compared to groups 3, 4 and 7. Group 8 did not show statistical difference. It is possible to conclude that, between groups, the less marginal adaptation was found at the low intensity. Both light curing time and distance did not show influence on marginal adaptation.