Etching time has been extended in wet etching course.
在湿法刻蚀诱导坑时，需适当延长刻蚀时间。
Objective: the aim of the study was to investigate the effects of different etching time on shear bonding strength to guide its clinical use.
目的：研究不同酸蚀时间和不同施力方向对正畸托槽与牙面间剪切强度的影响。
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。
The effects of potassium dichromate concentration, sulfuric acid concentration, etching temperature and etching time on the bulk etching rate of PP nuclear track membrane were discussed.
建立了基体蚀刻速率与重铬酸钾浓度、硫酸浓度、蚀刻温度的数学关联式；
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。
Identity CARDS washed the length of time will determine the depth of etching the word sign.
五星级标识牌冲刷时间的长短就决定了标牌字的蚀刻的深度。
How good sign production process, test swing carved this etching machine precision variable speed conveyor belt can, scouring the length of time can be adjusted here.
酒店标牌制作的工艺如何好，试刻这台精密摇摆蚀刻机传送带可以无级调速，冲刷时间的长短可以在这里进行调整。
Experimental curves of etching depth versus repeated rate and radiation time of laser pulse are given.
同时给出了刻蚀深度与脉冲速率及脉冲时间的实验曲线。
On the southeast tip of the island is a rock with a hole in the middle because of the long time lashing and etching of sea waves.
岛的西南端有块岩石，长久受着海水海浪的冲击侵蚀，最终在其中部形成了一个洞穴。
The etching effect factors such as solution concentration, temperature, reaction time and ultrasonic stirring etc were also investigated.
分析了酸性溶液中酸浓度、溶解温度、溶解时间和超声波作用对多组分磷酸盐玻璃化学浸蚀的影响。
The third stage etching in current method is a time-fixed etching, which easily causes under etching or over etching of the metal layer.
现有的刻蚀形成金属线时的第三阶段刻蚀采用了固定时间的刻蚀，极易造成金属层刻蚀不足或过刻蚀的问题。
The third stage etching in current method is a time-fixed etching, which easily causes under etching or over etching of the metal layer.
现有的刻蚀形成金属线时的第三阶段刻蚀采用了固定时间的刻蚀，极易造成金属层刻蚀不足或过刻蚀的问题。
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