Clinical effect of prosthesis on type Ⅴ maxillary defects / 口腔疾病防治

Objective @#To investigate the clinical efficacy of prosthesis retained by metal clasp and flexible clasp in the repair of type Ⅴ maxillary defects after tumor resection. @*Methods@#23 maxillary tumor surgical patients were selected in this study and restored with maxillofacial prosthesis. Total 24 prosthesis combined with metal clasp and flexible dentures were followed up for half a year to 2 years. @*Results @#After the application of prosthesis, better maxillofacial appearances are presented in all of the patients, Watian drinking water tests are improved to grade Ⅰ or Ⅱ from grade Ⅳ or Ⅴ in 21 patients, there was significant difference (P < 0.05); Soft diet can be masticated on affected side in 15 patients; The mean speech intelligibility score with and without prosthesis were (83.2 ± 7.3)% and (36.6 ± 5.6)%, there was significant difference (P < 0.05); Favorable hygienic situations of oral cavity and prosthesis are maintained in 18 patients.@*Conclusion @#Prosthesis combined with metal clasp and flexible denture performed favorable clinical efficacy and contributed to improve the living quality and mental health after tumor resection.

Mesenchymal Chondrosarcoma of Maxilla: A Rare Case Report.

Chondrosarcoma (CS) is a malignant tumor of long and flat bone characterized by the formation of cartilage. Mesenchymal chondrosarcoma is a rare variety of chondrosarcoma .It is a biphasic tumor with areas of spindle cell mesenchyme along with chondroid differentiation in the connective tissue stroma. A 17 year old male presented to us as a painless mass in maxilla. Contrast enhanced computed tomography (CECT) showed a lytic expansile lesion in the right maxillary bone with foci of calcification within soft tissue lesion. Fine needle aspiration cytology (FNAC) and incisional biopsy was performed which confirmed the diagnosis of maxillary Mesenchymal chondrosarcoma .The patient underwent right subtotal maxillectomy with 2 cm margins. The review of literature shows that very lesser number of maxillary Mesenchymal chondrosarcoma cases were reported so far. Therefore an attempt is made to add this rare case of MC of maxillary alveolus in the Existing literature.

Characteristics of airflow dynamics in upper airway after unilateral maxillectomy / 医用生物力学

Objective To study the characteristics of upper airway airflow dynamics during inspiration after unilateral total maxillectomy by means of computer numerical simulation. Methods Based on postoperative CT images of three patients with unilateral maxillary tumor, three-dimensional upper airway structures of the patients were reconstructed, and the upper airway airflow was simulated numerically by computational fluid dynamics method. Results The upper airway airflow trends of the patients during inspiration after unilateral maxillectomy were obtained. Airflow in the defect nasal cavity was separated, and made the spacious vortices of low velocity occurred throughout the entire maxillary defect cavity. Conclusions The upper airway trends of the three patients were generally in conformity with each other after their unilateral total maxillectomy, which illustrated that the respiratory patterns of such patients were of universality. Unilateral total maxillectomy resulted in structure changes of patients’ upper airway, which could disturb the upper airway airflow patterns，and affect the physiological functions of patients’ upper airway. Numerical simulation of patients' upper airway airflow after unilateral total maxillectomy could help to explain the phenomena of nasal drying and crusting, secretion accumulation as well as other symptoms of the kind of patients.

Maxillary ameloblastic fibroma: a case report

Ameloblastic fibroma is a relatively rare benign odontogenic tumor in which both the epithelial and ectomesenchymal components are neoplastic. An 8-year-old Caucasian boy was referred to the dentist for evaluation of failed eruption of the maxillary left first molar. The panoramic radiograph showed a well-circumscribed unilocular radiolucency involving an unerupted maxillary left first permanent molar. The lesion was enucleated and the material was sent for histopathologic examination. Microscopically, it was composed by cords and islands of odontogenic epithelium in a myxoid cell-rich stroma that closely resemble the dental papilla with histopathological diagnosis of ameloblastic fibroma. After 24 months of follow-up no recurrence was observed and the maxillary left first molar erupted spontaneously through the buccal mucosa and was aligned with a fixed orthodontic appliance. This case emphasized the importance of careful differential diagnosis of intraosseous oral lesions and reported a rarity of the lesion and its atypical location.

Fibroma ameloblástico é um tumor odontogênico benigno relativamente raro, em que ambos os componentes epiteliais e ectomesenquimais são neoplásicos. Menino de oito anos de idade, branco, foi encaminhado ao dentista para avaliar a falha na erupção do primeiro molar maxilar do lado esquerdo. A radiografia panorâmica revelou imagem radiolúcida, unilocular, bem circunscrita, envolvendo o primeiro molar permanente maxilar esquerdo incluso. A lesão foi enucleada e o material encaminhado para avaliação histopatológica. Microscopicamente, era composta de ilhas e cordões de epitélio odontogênico num estroma mixóide rico em células, que se assemelhava à papila dentária, com diagnóstico histopatológico de fibroma amelobástico. Após 24 meses de acompanhamento, nenhuma recorrência foi observada e o primeiro molar permanente maxilar irrompeu espontaneamente através da mucosa bucal e foi alinhado com aparelho ortodôntico fixo. Esse caso enfatiza a importância do cuidadoso diagnóstico diferencial das lesões orais intra-ósseas e relato de lesão rara e sua localização atípica.

Mixoma odontogénico / Odontogenic myxoma

El mixoma odontogénico se considera una neoplasia benigna, poco frecuente, de consistencia firme y gelatinosa, de crecimiento lento con potencial infiltrativo que produce expansión de la cortical con extensa destrucción ósea y alto índice de recidiva. De origen ectomesenquimàtico, probablemente derivado del órgano dentario. No existe una predilección particular por sexo, y si una ligera preferencia por presentarse en mandíbula, generalmente asintomàtico. Se presenta una paciente femenina de dieciséis años de edad, color de la piel blanca, con antecedentes de salud, que acude a consulta de cirugía màxilo facial por aumento de volumen de hemicara derecha, sin otra sintomatología acompañante. Al examen físico se observa aumento de volumen en región maxilar derecha. Al realizar tomografía axial computarizada se observó lesión hiperdensa que ocupaba todo el seno maxilar derecho, con àreas de mayor densidad, que respetaba el hueso que conforma el piso de la órbita. Bajo anestesia general naso traqueal se le realizó hemimaxilectomia, retirada de tumor y colocación de prótesis inmediata obturadora. Después de un año de evolución clínica y radiogràfica se colocó la prótesis definitiva, sin presencia de recidiva tumoral(AU)

An odontogenic myxoma is a uncommon benign neoplasm of a gelatinous and solid consistency, of lengthy growing with a infiltration potential producing an cortex expansion of with and extend bone destruction and a high rate of relapse. Its origin is ectomesenchymal, probably derived from dental organ. There is not a particular sexual preference, but a slight one by be present in mandible and generally asymptomatic. This is the case of a female white patient aged 16, with health backgrounds referred to Maxillofacial consultation due to an of right hemifacial increase without another accompanying symptomatology. At physical examination there is an increase in volume of right maxillary region. In computerized axial tomography (CAT) a hyperdense lesion occupying all right maxillary sinus with areas of higher density without affecting the orbit floor bone. Under nasotracheal general anesthesia a hemimaxillotomy was carried out, tumor removal and obturator immediate prosthesis placing. At a year of clinical course and radiography definitive prosthesis was placed without tumor relapse(AU)