Objective:To investigate the appearance of enamel on the cross section of tooth after etched with 37% phosphoric acid for different etching time .
目的：观察用37%磷酸凝胶以不同酸蚀时间处理后的牙釉质在牙齿横断面上的形态改变。
Meanwhile, the trend of porosity and PL spectrum with changing etching time confirm that it is necessary for improving PL intensity to increase porosity.
同时，孔隙率和光致发光谱随腐蚀时间的变化趋势证实了提高孔隙率是提高多孔硅发光强度的必要条件。
Objective:To investigate the most appropriate etching time in orthodontic treatment, by comparing the clinical failure rates of bracket bonded at 15 seconds and 60 seconds etching.
目的：比较15秒和6 0秒酸蚀后临床托槽脱落率的差异，从而探讨正畸临床适宜的牙釉质酸处理时间。
Compared with traditional technology, the present invention has the advantages of shortened etching time, raised etching efficiency, regular edge of resistance stripes and high graph quality.
本发明与传统的方法相比，缩短了刻蚀的时间，提高了刻蚀工艺的效率，电阻条边缘整齐，图形质量高。
The effect of the sclerotic dentin repaired with composite resin can be affected by the quality and quantity of hybrid layers and resin tags, and different etching systems and acid etching time.
混合层和树脂突的质和量以及不同的酸蚀系统和酸蚀时间都会影响硬化牙本质的复合树脂黏结修复效果。
The effect of the sclerotic dentin repaired with composite resin can be affected by the quality and quantity of hybrid layers and resin tags, and different etching systems and acid etching time.
混合层和树脂突的质和量以及不同的酸蚀系统和酸蚀时间都会影响硬化牙本质的复合树脂黏结修复效果。
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