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首页> 外文期刊>Caries research >Comparison of methods for evaluating mineral loss: hardness versus synchrotron microcomputed tomography.
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Comparison of methods for evaluating mineral loss: hardness versus synchrotron microcomputed tomography.

机译：评价矿物质损失的方法比较：硬度与同步加速器微型计算机断层扫描。

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摘要

This study analyzed degrees of demineralization in bovine enamel using synchrotron microcomputed tomography (SMCT) and hardness measurements (Knoop hardness number, KHN). For 5 days, 40 bovine enamel blocks were individually subjected to a pH cycling model and treatment with fluoride dentifrices (placebo, 275, 550 and 1,100 microg F/g) diluted in deionized water twice a day. Surface hardness number and cross-sectional profiles of hardness and mineral concentration (by SMCT) were determined. Integrated hardness (KHN x microm) for sound and demineralized specimens was calculated and subtracted to give the integrated loss of hardness (DeltaKHN) for the lesions. Increasing fluoride concentration in the dentifrices led to higher values for surface hardness after pH cycling and mineral concentration (g(HAp) cm(-3)), and lower values for DeltaKHN (p < 0.05). From the present results, it may be concluded that hardness measurements revealed demineralization in all groups, which was lower in groups treated with dentifrice with a higher F concentration. SMCT and hardness measurements gave similar results in areas with higher demineralization, but diverged in areas with lower demineralization.
机译：这项研究使用同步加速器微型计算机断层扫描（SMCT）和硬度测量值（努氏硬度值，KHN）分析了牛牙釉质的脱矿质度。连续5天，分别对40个牛牙釉质块进行pH循环模型处理，并用去离子水稀释的氟化物洁齿剂（安慰剂，275、550和1,100 microg F / g）每天两次。测定表面硬度值以及硬度和矿物质浓度的横截面轮廓（通过SMCT）。计算并减去声音和去矿物质标本的综合硬度（KHN x微米），得出病变的综合硬度损失（DeltaKHN）。洁齿剂中氟化物浓度的增加导致pH循环和矿物质浓度后的表面硬度值更高（g（HAp）cm（-3）），而DeltaKHN值更低（p <0.05）。从目前的结果可以得出结论，硬度测量显示所有组中的脱矿质，在用较高F浓度的洁牙剂治疗的组中，脱矿质较低。 SMCT和硬度测量在脱矿质较高的地区给出了相似的结果，但在脱矿质较低的地区却出现了分歧。

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