Mandibular Reconstruction and Dental Implantation after Segmental Mandibulectomy of Ameloblastoma of the Mandible

PURPOSE: Ameloblastomas are rare benign tumors of odontogenic origin, and compose about 1% of all oral and maxillomandibular cysts and tumors. Because this neoplasm has a high rate of local recurrence, segmental mandibulectomy with a 1~2cm safety margin and immediate microsurgical reconstruction is an accepted treatment modality. The authors experienced four mandibular reconstruction cases that underwent secondary dental implantation. Here, the authors describe these cases and their long-term results. METHODS: Four patients with ameloblastoma of the mandible underwent segmental mandibulectomy and reconstruction with a free fibula osseous flap from January 1999 to May 2005, followed by secondary dental implantation. Recurrence, bony union, implant osseointegration, and functional and aesthetic results were evaluated by radiologic imaging, by physical examination, and by using photographs. RESULTS: All free flaps survived with no evidence of flap loss. To date, no recurrence has been noted clinically or radiologically. Imaging after mandibular reconstruction with a free fibular flap revealed satisfactory bony unions and mandibular contours. The patients achieved good aesthetic and functional results after the secondary implantation. CONCLUSION: Mandibular reconstruction using a fibular osseous flap and secondary dental implantation can produce good functional and aesthetic results after segmental mandibulectomy for ameloblastoma.

Clinical Study of Malignant Melanoma for Recent 14 Years

PURPOSE: Recently, the incidence of malignant melanoma has been steadily increasing. Malignant melanoma is already known to have poorer prognosis than other primary skin cancers. Despite the poor prognosis, it is relatively less known to the public so that a number of patients visit hospital carrying advanced stage tumor. Yet, extensive study about malignant melanoma is currently insufficient, and specific guidelines and statistical figures in Korea are almost inexistent. Therefore, authors reviewed patients with malignant melanoma who have visited our hospital for last 14 years. METHODS: Between January 1994 and January 2008, 62 patients were diagnosed with malignant melanoma at our hospital. A retrospective study was performed with data from patients' charts and biopsy results. Annual incidence, mean age of onset, gender, tumor location, tumor thickness, pathologic ulceration, clinicopathologic subtype, and clinical AJCC stage were evaluated. Analysis of factors associated with survival were performed using the Cox proportional hazard model. Kaplan-Meier method was used to generate survival curves. RESULTS: Clinicopathologic features of 62 patients (32 male, 30 female) with average age of 57 years were evaluated. Most lesions were found in lower limb, and the most common subtype was acral lentiginous melanoma. We could also find that age, tumor thickness, and clinical stage were the only significant prognostic factors. CONCLUSION: Clinicopathologic features of malignant melanoma were analyzed in this study, but the result is not ready to be generalized because of the limited number of cases. Further study must be performed to report clinical guidelines for prognosis and treatment for malignant melanoma patients in Korea.