Peripheral Ossifying fibroma: a clinical report.

Most localized growths on the gingiva are considered to be reactive rather than neoplastic in nature. The authors describe a 20-year-old male patient with a peripheral ossifying fibroma in the maxilla exhibiting significant size with the disease duration of one year. The signs of recurrence in spite of thorough excision a debridement exposed the need for further study of the causes of recurrence. Clinical, radiographical, and histological characteristics are discussed.

Peripheral ossifying fibroma: a clinical report / Fibroma osificante periférico: un reporte clínico

Localized growths are commonly seen on the gingiva. Many of these enlargements are considered to be reactive rather than neoplastic in nature. Clinically differentiating one from the other as a specific entity is often not possible. Histopathologic examination is needed in order to positively identify the lesion. The peripheral ossifying fibroma is one such lesion. We report in this study, the clinical report of a 20-yr-old male patient with a peripheral ossifying fibroma in the maxilla exhibiting significant size with the disease duration of 1 year. The signs of recurrence in spite of thorough excision and debridement exposed the need for further study of the causes of recurrence and possible modes to avoid the situation. Clinical, radiographical and histological characteristics are discussed and recommendations regarding treatment and follow-up are provided.

Aumentos de volumen localizados se observan con frecuencia en la encía. Muchos de estos crecimientos se consideran de tipo reaccional más que de naturaleza neoplásica. Clínicamente diferenciar uno del otro como una entidad específica no siempre es posible. El examen histopatológico es necesario con el fin de identificar positivamente a la lesión. El fibroma osificante periférico es una de estas lesiones. Se presenta en este estudio, el informe clínico de un paciente de sexo masculino de 20 años de edad con un fibroma osificante periférico en el maxilar de un tamaño significativo con 1 año de duración de la lesión. Los signos de recurrencia a pesar de la escisión completa y desbridamiento expusieron la necesidad de estudiar más a fondo las causas de la recurrencia y los posibles modos de evitar la situación. Las características clínicas, radiográficas e histológicas son discutidas junto a recomendaciones sobre el tratamiento y seguimiento.

Effect of variation of root post in different layers of tooth: linear vs nonlinear finite element stress analysis.

The objective of this study was to obtain an accurate stress distribution pattern on different domains of a post- and core-treated tooth, taking into account the nonlinear properties of the periodontal ligament (PDL). Linear stress and deformation analysis was carried out using four posts, different in constitution and shape. Accurate three-dimensional models of a restored tooth with different layers were prepared using CAD modeling software. The study was carried out using a cast metal post and core assembly, a glass fiber, a carbon fiber, and a titanium post with a composite resin core. For each restoration, parallel, tapered and threaded posts were modeled. However, PDL exhibits nonlinear properties ensuring a uniform stress distribution in the tooth structure. Hence, accurate results could be expected by simulating the model for the nonlinear properties of PDL. Owing to computational difficulties, a simplified model was prepared in the ANSYS environment and nonlinear stress analysis was carried out. The results indicate that for optimum strength, rigidity and flexibility, tapered fiber posts with a composite resin core cemented to the root are desirable. Under similar loading conditions, in the case of nonlinear analysis, the stresses decreased by approximately 25% and the deformation increased by approximately 50% as compared with those in case of linear static analysis for an endodontically treated maxillary central incisor. Thus, stress distribution within the restored tooth and surrounding tissues can be better anticipated by a dentist. From the results of this study, the dimensions of a post could be modified, to further reduce stress in the oral cavity and thereby reduce the risk of root and post fractures.