Comparison of the accuracy of cone-beam computed tomography, photostimulable phosphor imaging plate, charge coupled device, and conventional intraoral radiography in the diagnosis of internal root resorption: an in vitro study / Comparação da precisão da tomografia computadorizada de feixe cônico, placa de imagem de fósforo fotoestimulável, chargecoupleddevice(CCD), e radiografia intra-oral convencional no diagnóstico de reabsorção radicular interna: um estudo in vitro

Objective: Various radiographic methods are used to identify the internal root resorption. The aim of this study was to assess and compare the diagnostic accuracy of cone-beam computed tomography (CBCT), photostimulable phosphor (PSP) imaging plate, charge coupled device (CCD), and conventional intraoral radiography (CIR), for internal root resorption. Material & Methods: This experimental study was conducted in Hamadan in 2012. Fifty seven carries-free single-rooted teeth were divided into three intervention groups of 15 teeth and one control group of 12 teeth. Teeth were split into two parts using a disk. Cavities of 0.5, 1 and 1.5 mm in depth were created in root canal of teeth to simulate internal root resorption artificially. Finally, the teeth fragments were fused. All teeth were examined with four different procedures and the results were compared with known simulated internal root resorption as the gold standard to determine the sensitivity and specificity of the procedures. Results: The sensitivity of CBCT, PSP, CCD, and CIR for diagnosis internal root resorption of 0.5 mm in depth was 93%, 73%, 60%, and 53% respectively. The sensitivity of all four procedures for diagnosis of internal root resorption with 1 and 1.5 mm in depth was the same and equal to 100%. Specificity of the four radiology procedures for diagnosis of internal root resorption of any depth was 100%, 100%, 83% and 75% respectively. Conclusion: CBCT provides the most accurate information on the depth and location of root resorption followed by the PSP and CCD respectively. Accordingly, conventional intraoral radiography was the least accurate procedure

Objetivos: Vários métodos radiográficos são utilizados para identificar a reabsorção radicular interna. O objetivo deste estudo foi avaliar e comparar a precisão do diagnóstico de reabsorção radicular interna por tomografia computadorizada de feixe cônico (TCFC), placa de imagem de fósforo fotoestimulável(FFE), Charge CoupledDevice( CCD) e radiografia intra-oral convencional (RIC). Material e Métodos: Este estudo experimental foi realizado em Hamadan em 2012. Cinqüenta e sete dentes anteriores livres de cárie foram divididos em três grupos de 15 dentes e um grupo de 12 dentes foi utilizado como controle. Os dentes foram divididos em duas partes usando um disco. Cavidades de 0,5, 1 e 1,5 mm de profundidade foram criados nos canais radiculares dos dentes para simular a reabsorção radicular interna artificialmente. A seguir , os fragmentos de dentes foram unidos . Todos os dentes foram examinados com quatro diferentes procedimentos e os resultados foram comparados com um padrão ouro conhecido de diagnóstico de reabsorção radicular interna simulada para determinar a sensibilidade e especificidade dos procedimentos. Resultados: A sensibilidade da TCFC, FFE, CCD e RIC para diagnóstico reabsorção radicular interna de 0,5 mm de espessura foi de 93 %, 73 %, 60 % e 53 %, respectivamente. A sensibilidade dos quatro processos para o diagnóstico da reabsorção radicular interna com 1 e 1,5 mm de profundidade foi a mesma e igual a 100 %. A especificidade dos quatro procedimentos de radiologia de diagnóstico de reabsorção radicular interna de qualquer profundidade foi de 100 %, 100 %, 83 % e 75 %, respectivamente. Conclusão: A TCFC fornece as informações mais precisas sobre a profundidade e localização da reabsorção radicular, seguido pelo FFE e CCD, respectivamente. Assim, a radiografia intra-oral convencional foi o procedimento menos preciso.

The knowledge and attitude of general dentists toward denture adhesives in Tehran.

Background: The purpose of this study was to generate discussion and communication among a group of general dentists in Tehran on their viewpoints regarding denture adhesives. Have they accepted denture adhesive as a material to enhance denture retention, stability and function? Materials and Methods: In the summer of 2007, a questionnaire was mailed to 300 general dentists who were assigned with a random systematic sampling method from general dentists in Tehran. The questions were arranged in two parts of evaluating knowledge and attitude. In evaluation of knowledge, dentists were classified into groups of good, moderate, weak and lack of knowledge. In evaluation of attitude, dentists were classified into positive, moderate and negative groups. (Evaluating attitude was carried out in good and moderate groups of knowledge.) Results: The study showed that 14%, 32% and 37% of the general dentists had respectively good, moderate and weak knowledge toward denture adhesive while 16.3% had no knowledge about this material. In evaluation of attitude through dentists with positive and moderate knowledge toward denture adhesive, 9.3%, 71.3% and 19.4% had respectively positive, moderate and negative attitude toward denture adhesive. The c2 test showed a significant statistical relation between situation of knowledge and experiences of dentists. Discussion: This study demonstrated that the rate of knowledge of these 300 general dentists in Tehran towards denture adhesives has not been in a good situation. It is believed that denture adhesive be able to enhance the fitness of a denture and provide psychological relief to the patient. Dentists agreed that education, not only for practitioners but also for patients, would raise the advantageous features and reduce the misuse of denture adhesive. Education of the topic "Denture adhesive" should be more concerned in dental universities.