含氟纳米氟磷灰石糊剂修复人工釉质缺损

背景：纳米氟磷灰石糊剂涂敷法可在人牙齿表面生长出类似牙釉质的柱状晶体。目的：观察1mg/L人体安全浓度的氟离子对纳米氟磷灰石糊剂修复人工釉质缺损的影响。方法：将人工早期釉质缺损样本随机分成两组,分别在样本表面涂敷添加含氟的纳米氟磷灰石糊剂（实验组）与不加氟的纳米氟磷灰石糊剂（对照组）,置于37℃水浴孵箱中修复。反应前后对牙齿表面行扫描电镜观察,晶体结构分析,化学成分鉴定和韦氏显微硬度测试。结果与结论：经处理后,两组样品表面都可见有一层与牙釉质化学组成和晶体结构类似的晶体生成,但实验组牙釉质样品表面结晶度、韦氏显微硬度明显高于对照组样品（P〈0.05）,且实验组牙釉质样品表面更光滑。结果表明,人体安全浓度含氟纳米氟磷灰石糊剂可明显提高人工釉质龋显微硬度、结晶度和表面光滑度。

Repair of artificial enamel lesions by nano fluorapatite paste containing fluorin

BACKGROUND：Enamel-like crystals could grow on human tooth by application of the neutral（pH 7.5） nano-fluorapatite paste. OBJECTIVE：To evaluate the effect of nano fluorapatite paste with addition of 1 mg/L fluorin on the repair of artificial enamel lesions. METHODS：Enamel blocks with artificially-induced lesions by 17% phosphate acid solution were randomly divided into two groups that were respectively coated with neutral（pH 7.5） nano-fluorapatite pastes with two different content of fluorin（the group without addition of fluoride ions was set as the controlled group,the other one with addition of 1 mg/L fluoride ions was set as the experimental group） for 15 minutes at 37 ℃. Scanning electronic microscope,XRD,XPS and Vickers micro-hardness test were performed for the enamels before and after treatment. RESULTS AND CONCLUSION：A layer of enamel-like fluoride substituted hydroxyapatite was observed on the surface of all the samples,but the crytallinity of the experimental group was obviously higher than that of natural enamel and controlled group. But the crystallinity and Vicker micro-hardness of the experimental group was higher than the controlled group obviously（P 0.05） ,and the surfaces were smoother. The results indicated the fluorinion had significant effect on the repair of enamel lesion by neutral（pH 7.5） nano-fluorapatite pastes at improvement of Vickers micro-hardness,crystallinity and smoothness of the enamel.