RESUMO
INTRODUCTION: This study evaluated the influence of cast-gold posts on the diagnostic ability of a cone beam computed tomography (CBCT) system in assessing longitudinal root fractures. In addition, the influence of gutta-percha and variations in voxel resolution were assessed. METHODS: One hundred eighty endodontically prepared teeth were divided into 3 experimental and 3 control groups and placed in a dry human skull. The teeth in the experimental groups were artificially fractured. Certain experimental and control groups were filled with gutta-percha cones. Other experimental and control groups were filled with cast-gold posts. All the teeth were viewed by using a tomography scan with 2 voxel resolution protocols (0.3-mm and 0.2-mm). A calibrated examiner, blinded to the protocol, assessed the images by using the nominated scan software. RESULTS: The kappa values obtained for intraobserver reproducibility were 0.84 and 0.93 for 0.3-mm and 0.2-mm voxel resolution, respectively. The presence of gutta-percha or posts reduced the overall sensitivity and specificity in both voxel resolutions, but with no significant association. The CBCT specificity values were similar and did not depend on the voxel resolution adopted. In contrast, the sensitivity values were significantly higher for 0.2-mm voxel resolution in nonfilled (P < .05), gutta-percha (P < .001), and overall (P < .001) groups. CONCLUSIONS: The CBCT diagnostic ability was not influenced by the presence of posts or gutta-percha, and the 0.3-mm voxel resolution images were demonstrated not to be a reliable protocol for the investigation of longitudinal root fractures.
Assuntos
Tomografia Computadorizada de Feixe Cônico/normas , Ligas de Ouro/química , Técnica para Retentor Intrarradicular , Fraturas dos Dentes/diagnóstico por imagem , Raiz Dentária/lesões , Adaptação Marginal Dentária , Reações Falso-Negativas , Reações Falso-Positivas , Guta-Percha/química , Humanos , Processamento de Imagem Assistida por Computador/normas , Modelos Anatômicos , Variações Dependentes do Observador , Intensificação de Imagem Radiográfica/normas , Radiografia Interproximal , Reprodutibilidade dos Testes , Materiais Restauradores do Canal Radicular/química , Tratamento do Canal Radicular , Sensibilidade e Especificidade , Método Simples-Cego , Dente não Vital/diagnóstico por imagemRESUMO
OBJECTIVE: To test the null hypothesis of no difference in caries detection in dim, bright, and hooded environments for laptop viewing of intraoral radiographs. STUDY DESIGN: Extracted posterior teeth were imaged with posterior bite wing geometry by using storage phosphor plates. Images were displayed on a laptop computer placed in 3 lighting environments. Six dental students and 6 faculty observers scored the caries status of proximal surfaces. Responses were compared to histologic ground truth by using receiver operating characteristic (ROC) analysis and other measures of accuracy. Performance was also compared to photometer-measured light levels and time spent in observation. RESULTS: ROC A(Z) was significantly higher for faculty using hooded displays (0.87) than in a bright clinical environment (0.79; P = .04). Student performance was highly variable and not significantly different in any of the lighting environments. CONCLUSION: The ability to detect caries by experienced clinicians may be improved by hooding laptop displays in bright clinical environments.
Assuntos
Cárie Dentária/diagnóstico por imagem , Diagnóstico por Computador/instrumentação , Iluminação , Microcomputadores , Análise de Variância , Terminais de Computador , Docentes de Odontologia , Humanos , Variações Dependentes do Observador , Radiografia Dentária Digital , Sensibilidade e Especificidade , Estudantes de OdontologiaRESUMO
Os autores apresentam dois casos (pai e filho) de portadores de sinais e sintomas cujas características se identificam com os da enfermidade descrita como Síndrome de Gardner
