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Background: To assess the effect of clinicopathologic factors on local tumor control and survival in patients with mandibular alveolar carcinoma. Methods: Fifty patients with mandibular alveolar carcinoma treated surgically were included in this study. There were 3 patients with T1, 25 with T2, 5 with T3, and 17 with T4 disease. Clinical evidence of bone invasion was noted in 47 patients. A hemi- or segmental mandibulectomy was performed on 37 patients, whereas 10 patients had a marginal mandibulectomy. The impact of clinicopathologic variables on local tumor control and patient survival was assessed by univariate analysis. Variables included T and N stage, dental extraction, treatment modality, tumor differentiation, nodal status, surgical margin, and bone invasion. Results: Eleven patients (22%) develop recurrent disease, including 8 local recurrences, 1 neck, and 2 distant metastases. Overall, the 5-year actuarial rates of local control and disease-specific survival were 85 and 73%, respectively. Most local recurrences after surgical treatment were caused by inadequate resection margins. When resection margins were negative, the survival and local control rate were significantly better than when there were positive resection margins (survival, 91 vs. 11%; local control, 100 vs. 49%; p < 0.01). Neither T and N stages, clinical stage, tumor differentiation, dental extraction, bone invasion, extent of bone resection, nor treatment modality influenced outcome. Conclusions: The status of surgical margins was of major importance for the outcome of patients with gingival carcinoma of the mandible.

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The trapped magnetic field in an HTS bulk is decayed and even erased by the application of an AC magnetic field whose amplitude is much smaller than the maximum trapped magnetic field. In previous experiments, the decay of the trapped magnetic field was shown to be due to the temperature rise of the bulk caused by the AC losses. Especially, in a high frequency magnetic field, AC losses are larger and the decay of the trapped magnetic field is accelerated by this AC loss increase. We investigated the time relationships of the AC loss of the HTS bulk in a high frequency magnetic field using the thermal equilibrium equation.Index Terms-AC loss, bulk temperature, HTS bulk, thermal equilibrium equation, trapped magnetic field.

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