Bone healing of mandibular critical-size defects in spontaneously hypertensive rats

Few articles have shown changes in bone metabolism caused by hypertension. The objective of this study was to investigate the relationship between hypertension and bone healing. Circular critical-size defects 5 mm and 2 mm in diameter were created, respectively, on the left and right side of the mandible in 40 spontaneously hypertensive and 40 control Wistar-Kyoto rats. Five animals from each strain were killed 2, 3, 5, 10, 15, 30, 60 and 90 days after surgery. The macroscopic evaluation showed great mandibular angle deformation on the left side and non-healed defects on both sides and groups. Histological evaluation revealed similar bone healing on both sides, with initial necrosis in the central area, and fibrosis and angiogenesis within the first 5 days. From the 10th postoperative day on, the newly formed bone displayed progressive thickening until the 90th postoperative day, when the defect margins presented a compact bone structure. Furthermore, the statistical analysis of the histometric data did not reveal any significant hypertension effect on bone healing in the defect area. These results suggest that bone healing was not different between spontaneously hypertensive rats and control rats.

Displasia fibrosa da mandíbula / Fibrous dysplasia of mandible

A displasia fibrosa da mandíbula é uma patologia óssea benigna que representa cerca de 2% de todos os tumores ósseos. Relatamos o caso de uma paciente de 11 anos de idade, com queixa de dor em região mandibular esquerda há 1 semana, com história de abaulamento da mesma região há 3 meses. Após realização de exames de imagem, foi diagnosticado displasia fibrosa da mandíbula. O objetivo deste relato é revisar as principais características clínicas, radiológicas e possíveis tratamentos para o caso, dando a devida importância para o seguimento ambulatorial pós-tratamento

Fibrous dysplasia is a benign bone disease which represents about 2% of all bone tumors. Here we report the case of an 11-year-old who complained of pain at the left mandible area for a week, with history of arching in this area for 3 months. Imaging examinations led to the diagnosis of fibrous dysplasia of the mandible. The aim of this work is to review the main clinical and radiological characteristics and possible treatments for the case, giving due importance to ambulatory follow-up care

Tumores Ondontogénicos: reporte de tres casos y revisión de la literatura / Odontogenic tumors: report of three cases and literature review

Los tumores odontogénicos son neoplasias que se desarrollan exclusivamente en mandíbula o el maxilar, originadas por proliferación del tejido epitelial mesenquimal. Representan 5 por ciento 8 por ciento de los tumores de cavidad oral. La gran mayoría son benignos y sólo 5 por ciento presentan características malignas. Reportamos los hallazgos clínicos, radiológicos y patológicos de tres casos: mixoma odontógeno, carcinoma primario intraóseo y carcinoma ameloblástico. Las neoplasias derivadas del aparato odontogénico constituyen un grupo morfológicamente heterogéneo poco frecuente de lesiones que afectan a los maxilares y región bucal. Los tipos histológicos más comunes son: odontomas complejos y compuestos (65 por ciento), ameloblastoma con 11 por ciento, tumor odontogénico adenomatoide 3 por ciento y mixoma odontogénico. Todos fueron tumores malignos uno benigno. Los de origen odontógeno son infrecuentes, debemos tener en cuenta como diagnóstico diferencial de lesiones clínicamente originadas en el maxilar superior y mandíbula. La resección quirúrgica amplia con márgenes adecuados es el tratamiento de elección.

Odontogenic tumours are neoplasms developed exclusively in maxilla and mandible, arise from the epithelial component or the mesenchyman. They account for minimum percentage of all oral cavity tumors, represent between 5 % and 8 %. Mostly are benign neoplasms only 5 % are malignant. Clinico-pathological features, radiological findings and outcomes: odontogenic myxoma, primary intraosseous carcinoma and one ameloblastic carcinoma are presented. Odontogenic neoplasm derived from the odontogenic apparatus or its cellular remnants comprise a morphologically heterogeneous group of tumors that affect the oral and maxillofacial region. Most common histological types are the complex and compound odontomas (65 %), followed by ameloblastoma with 11 %, adenomatoid odontogenic tumour with 3 % and odontogenic myxoma. Our review comprises two malignant tumors and one benign. Odontogenic tumors are rare we must consider them in the differential diagnosis in maxilla and mandible tumors. Wide surgical resection with oncologic margins is the treatment of choice.