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Avaliação da precisão do CBCT na localização do canal mandibular : estudo comparativo em cadáveres
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Abstract(s)
Objetivos: Avaliar a precisão do CBCT utilizado na Clínica Dentária Universitária Egas Moniz (CDUEM), com recurso a medições anatómicas diretas do canal mandibular num corte transversal em mandíbulas cadavéricas. Procura-se comparar cada um dos valores obtidos nas medições anatómicas com os fornecidos pelo CBCT nas mesmas localizações, avaliar a influência da presença de dentes na precisão do CBCT e procurar relações significativas entre as diferentes distâncias em zonas edêntulas e dentadas.
Materiais e Métodos: Após o processo de seleção, foram utilizadas 8 cabeças de cadáver criopreservadas e 54 distâncias para comparação entre as medições cadavéricas e radiológicas obtidas pelo CBCT. Para cada uma das cabeças foi realizado um CBCT e posteriormente à sua disseção foram feitos 2 cortes transversais, 1 em cada hemi-arcada mandibular, obtendo-se visão direta para o canal mandibular, permitindo medir a sua distância a 4 pontos, à tábua óssea vestibular, lingual, ao bordo superior e inferior da mandibula. As mesmas 4 distâncias nos mesmos 2 cortes transversais foram depois medidas no CBCT. A análise das medições foi efetuada recorrendo à estatística descritiva e inferencial, para p<0,05.
Resultados: Não se verificaram diferenças estatisticamente significativas entre as medições anatómicas e as do CBCT. A presença de dentes no local de medição não revela afetar a precisão do CBCT. A distância do CM ao bordo superior mandibular é inferior em zonas edêntulas.
Conclusão: O CBCT é um meio auxiliar de diagnóstico preciso e capaz de replicar fielmente os dados anatómicos reais. A ausência de peças dentárias provoca reabsorção óssea.
Objectives: This study will evaluate the accuracy of CBCT used at the Clínica Dentária Universitária Egas Moniz (CDUEM), using direct anatomical measurements of the mandibular canal in a cross section in cadaveric mandibles. The aim is to compare each of the values obtained in the anatomical measurements with those provided by CBCT in the same locations, to assess the influence of the presence of teeth on CBCT accuracy and to search for significant relationships between the different distances in edentulous and dentate areas. Materials and Methods: After the selection process, 8 cryopreserved cadaver heads and 54 distances were used for comparison between cadaveric and radiological measurements obtained by CBCT. For each of the heads a CBCT was performed and after its dissection 2 cross-sections were made, 1 in each mandibular hemi-arc, obtaining direct view to the mandibular canal, allowing to measure its distance to 4 points, to the buccal, lingual, upper and lower mandibular bone plate. The same 4 distances in the same 2 cross-sections were then measured on CBCT. Analysis of the measurements was performed using descriptive and inferential statistics for p<0.05. Results: There were no statistically significant differences between the anatomical and CBCT measurements. The presence of teeth at the measurement site did not show to affect the accuracy of CBCT. The distance from the CM to the mandibular upper border is shorter in edentulous areas. Conclusion: CBCT is an accurate diagnostic aid that can reliably replicate real anatomical data. The absence of dental pieces causes bone resorption.
Objectives: This study will evaluate the accuracy of CBCT used at the Clínica Dentária Universitária Egas Moniz (CDUEM), using direct anatomical measurements of the mandibular canal in a cross section in cadaveric mandibles. The aim is to compare each of the values obtained in the anatomical measurements with those provided by CBCT in the same locations, to assess the influence of the presence of teeth on CBCT accuracy and to search for significant relationships between the different distances in edentulous and dentate areas. Materials and Methods: After the selection process, 8 cryopreserved cadaver heads and 54 distances were used for comparison between cadaveric and radiological measurements obtained by CBCT. For each of the heads a CBCT was performed and after its dissection 2 cross-sections were made, 1 in each mandibular hemi-arc, obtaining direct view to the mandibular canal, allowing to measure its distance to 4 points, to the buccal, lingual, upper and lower mandibular bone plate. The same 4 distances in the same 2 cross-sections were then measured on CBCT. Analysis of the measurements was performed using descriptive and inferential statistics for p<0.05. Results: There were no statistically significant differences between the anatomical and CBCT measurements. The presence of teeth at the measurement site did not show to affect the accuracy of CBCT. The distance from the CM to the mandibular upper border is shorter in edentulous areas. Conclusion: CBCT is an accurate diagnostic aid that can reliably replicate real anatomical data. The absence of dental pieces causes bone resorption.
Description
Dissertação para obtenção do grau de Mestre no Instituto Universitário Egas Moniz
Keywords
Canal mandibular CBCT Disseção anatómica Precisão