The effect of fluoride on dental alloys in different concentrations of fluoride artificial saliva / 华西口腔医学杂志

<p><b>OBJECTIVE</b>To study the changes in surface morphology of cobalt-chromium alloy, pure titanium and high-cobalt chromium molybdenum alloy immersed in artificial saliva with different concentrations of fluoride, and to analyze the corrosion resistance of these metals.</p><p><b>METHODS</b>The three kinds of metal were polished and then were immersed in artificial saliva with different concentrations of fluoride (0%, 0.05%, 0.2%). All specimens were immersed for 3 weeks at (37.0 +/- 1.0) degrees C. Metal surface roughness before and after immersion were measured and analyzed by scanning electron microscope (SEM).</p><p><b>RESULTS</b>Metal surface roughness was increased with the concentration of fluoride. The surface roughness of the Co-Cr group and Ti group had a statistically significant difference between before and after immersion at the fluoride concentration of 0.05% (P<0.01), and the difference between Co-Cr group and vitallium2000 group, Ti group and vitallium2000 group were statistically significant difference (P<0.01). The differences of three groups before and after immersion were statistically significant at the fluoride concentration of 0.2% (P<0.01), and the difference among three groups was statistically significant (P<0.01).</p><p><b>CONCLUSION</b>Patients who frequently use fluoride products should not use pure titanium or cobalt-chromium alloy prosthesis. Patients with these three metal prostheses are not advised to use high concentration fluoride products.</p>

Clinical outcomes of Cyberknife in brain metastases / 中华放射肿瘤学杂志

Objective To retrospectively analyze clinical outcomes of brain metastases treated with Cyberknffe. Methods From Aug. 2006 to Aug. 2007, 40 patients with brain metastases treated with Cy-berknife in Tianjin Cancer Hospital were included. Totally 68 brain metastatic lesions were treated. The maximal diameter was 0.4 -7.5 cm (average 1.9 cm). The primary tumor of 35 patients was partial re-ponse or stable to the previous treatment at the diagnosis of brain metastasis. The geometric center of target volume was set as the isocenter and the nominal standard dose point. More than 95% target volume was cov-ered by 80% isodose surface. Hypofractionated radiation was 18 -36 Gy given in 1 -5 fractions of 5 -25 Gy. Results The Follow-up rate was 95%. The clinical symptom remission rate (including complete and partial remission) at one week after Cyberknife treatment was 90% (36/40). The therapeutic effective rate (CR + PR + SD) was 94% (64/68) after three months follow-up, which was evaluated by contrast-en-hanced CT or MRI. The 3-month local control and 1-year survival rates were 78% (53/68) and 68% (27/40). New brain metastatic lesions outside the radiation field occurred in 14 patients within 3 months, which was independent of age, whole brain irradiation, number or maximal diameter of original lesions, frac-tion dose, frequency or total dose of Cyberknife treatment. Conclusions Cyberknife, used as the primary treatment of brain metastases, can achieve good clinical outcomes.

临床、保健、康复相结合的脑性瘫痪早期干预模式 / 中国康复理论与实践

@#目的探索脑瘫患儿早期发现、早期干预的工作模式。方法临床、保健、康复相结合 ,采用产前检查、孕妇学校、产时儿科医生进产房、新生儿行为神经评定测定、高危儿抚触训练室、婴儿期儿童保健监测、各街道防治站常规体检筛查转诊等多种形式结合早期发现并干预脑瘫高危儿。结果此工作模式较模式前显著提高了脑瘫的早期诊断率及康复疗效。结论临床、保健、康复相结合的方式整合了医疗资源,起到了促进脑瘫早发现、早诊断、早治疗的作用 ,值得推广。