| Objectives: to evaluate the correlation of the bone mineral density (BMD) from maxilla and mandible with that of the cervical vertebrae, using Hounsfield units (HU) and multislice computed tomography (CT) to verify whether CT could be a useful osteoporosis screening tool. Methods: 79 multislice CT examinations from patients who underwent CT examinations of maxilla, mandible and cervical vertebrae simultaneously were included. The following left and right anatomical regions were assessed: mandible ramus; mandible head; the area below the inferior first molar and the area below the upper cuspids. HU were measured in each area using a 0.1 cm region of interest (ROI) positioned in the center of the slice. Results: a significant correlation between the cervical spine and the posterior region of the mandible was found, as well as a significant correlation between the anterior maxilla and the cervical spine. However, no correlation was found between the cervical spine and other parts of the mandible, such as ramus and head of mandible. Conclusions: As anterior maxillary bone and posterior mandible bone HU values correlate with cervical bone HU values, this examination may be applied as osteoporosis screening tool. DESCRIPTORS | Osteoporosis; Computed tomography; Hounsfield Unit; Bone Mineral Density.RESUMO | Utilização exames de tomografia computadorizada da maxila e mandíbula e sua correlação com as vértebras cervicais objetivando o rastreamento de pacientes com risco de osteoporose • Objetivos: avaliar a correlação da densidade mineral óssea (DMO) da maxila e mandíbula com as vértebras cervicais, utilizando unidades de Hounsfield (HU), utilizando tomografia computadorizada (TC) multislice, para verificar se a TC pode ser útil como ferramenta de rastreamento da osteoporose. Métodos: 79 exames de tomografia computadorizada multislice de pacientes que foram submetidos a CTs de maxila, mandíbula e vértebras cervicais simultaneamente foram incluídos. As seguintes regiões anatômicas esquerda e direita foram avaliadas: ramo da mandíbula; cabeça mandibular; a área abaixo do primeiro molar inferior e a área abaixo das cúspides superiores. HU foram medidos em cada área usando uma região de interesse (ROI) de 0.1cm posicionada no centro do corte tomográfico. Resultados: Foi encontrada uma correlação significativa entre a coluna cervical e a região posterior da mandíbula, bem como uma correlação significativa entre a região anterior da maxila e a coluna cervical. No entanto, nenhuma correlação foi encontrada entre a coluna cervical e outros locais da mandíbula, como o ramo mandibular e a cabeça. Conclusões: Como os valores de HU do osso anterior e posterior da mandíbula se correlacionam com os valores de HU do osso cervical, este exame pode ser aplicado a ferramentas de rastreio da osteoporose.
pelo carinho, dedicação, amizade e oportunidade deste trabalho. ÀProf. Dra. Emiko Saito Arita pela disponibilidade e paciência.
Osteosarcoma (OS) is the most common primary malignant tumor of bone. However, osteosarcoma located in the jaw (JOS) is rare, aggressive and malignant, constituting 5% to 13% of all cases of skeletal OS. JOS has a male predilection with 34 to 36 years old. Prognostic is associated with several variables, such as tumor location, initial size, existence or absence of metastasis, gender, age, cytogenetic chances and respond to chemotherapy. We report the unusual case of osteosarcoma in the mandible on retromolar area arising from primitive bone forming mesenchyme; most often arises in the metaphysis of long bones of the extremities.
<p>This article reports a case of 65 year-old man consultedin a private radiology dental clinic for a panoramicradiography, where was indicated a radiolucent area,extending into the periapical region of the teeth 35 to 43 to the base of the mandible. Radiographydiagnosis was difficult. The immunohistochemical examination showed immunoreactivity for theproteins CD 68, S-100 and CD 1a. Histopathologicaldiagnosis was obtained for Langerhans cell granuloma(histiocytosis X). Langerhans cell histiocytosis iscaused by the abnormal proliferation of histiocytes, previously called Histiocytosis X. It is a rare diseasethat preferentially affects children and young adultswith a predilection for males and can affect differentparts of the body.</p><p>Keywords<br />Adult; Histiocytosis; Langerhans; Mandible.</p>
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