The aim of this study was to investigate the effect of surface roughening and acid etching on clinical success rate and removal and insertion torque of orthodontic miniscrews. Sixty-two orthodontic miniscrews (Jail Medical Corporation, Seoul, Korea) with the same design and dimensions (10-mm length, 2-mm diameter) are divided into two (sandblasted and acid-etched versus control) groups. The sample of the study was 31 patients whose miniscrews were needed for en masse retraction of the upper six anterior teeth. In this split-mouth study, the miniscrews were placed in the attached gingiva between the second premolar and the first molar. The side (left or right) was selected randomly. The miniscrews were loaded 6 weeks after insertion, and the patients were followed up after 3, 6, 10, 14, and 18 weeks and then for 4 weeks interval. Chi-square, correlation, and independent t tests were done using SPSS ver24 to interpret the data. The survival rate was 90.3% and 83.9% for the sandblasted and acid-etched versus the control group, respectively. The difference in survival rate was not statistically significant (p > 0.05). Removal torque was higher for the sandblasted group (p < 0.05). Younger patients showed less survival rate (p < 0.05) in both groups. Insertion side, namely, left or right, was not statistically significant. Although sandblasting increased removal torque, it did not influence the survival rate of orthodontic miniscrews significantly.

中文翻译：

---

喷砂和酸蚀对正畸微螺钉成活率的影响：裂口随机对照试验

这项研究的目的是研究表面粗糙和酸蚀对临床成功率以及正畸微型螺钉的去除和插入扭矩的影响。设计和尺寸相同（长度10毫米，直径2毫米）的62个正畸微型螺钉（Jail Medical Corporation，韩国首尔）分为两个组（喷砂和酸蚀与对照组）。该研究的样本为31例患者，这些患者需要微螺钉才能整体撤回上六颗前牙。在这项裂口研究中，将微螺钉放置在第二个前磨牙和第一个磨牙之间的附着牙龈中。侧面（左侧或右侧）是随机选择的。微型螺钉在插入后6周加载，对患者进行3、6、10、14和18周的随访，然后间隔4周。卡方 相关性，并使用SPSS ver24进行独立的t检验以解释数据。喷砂和酸蚀后的存活率分别为90.3％和83.9％。生存率差异无统计学意义（p> 0.05）。喷砂组的去除扭矩更高（p <0.05）。两组年轻患者的生存率均较低（p <0.05）。插入侧（即左侧或右侧）在统计上不显着。尽管喷砂提高了去除扭矩，但并没有显着影响正畸微螺钉的存活率。生存率差异无统计学意义（p> 0.05）。喷砂组的去除扭矩更高（p <0.05）。两组年轻患者的生存率均较低（p <0.05）。插入侧（即左侧或右侧）在统计上不显着。尽管喷砂提高了去除扭矩，但并没有显着影响正畸微螺钉的存活率。生存率差异无统计学意义（p> 0.05）。喷砂组的去除扭矩更高（p <0.05）。两组年轻患者的生存率均较低（p <0.05）。插入侧（即左侧或右侧）在统计上不显着。尽管喷砂提高了去除扭矩，但并没有显着影响正畸微螺钉的存活率。