Abstract：
OBJECTIVE: The intrusion of anterior teeth is a routine procedure in orthodontics, which has been performed efficiently with the help of mini-screws in the anterior region, especially the upper maxilla. This study aimed to investigate the effect of insertion angle and sociodemographic features on the success rate of mini-screws at the anterior maxillary region.
METHODS: Twenty-nine patients (18 Females and 11 Males) aged 18-40 years old were involved in the current study. A split-mouth design was carried out in which recruited patients needed bilateral anterior screws at the labial bone in the region of the incisor for the intrusion of upper anterior incisor teeth as part of their orthodontic treatment with a fixed appliance (upper right side received 90-degree insertion angle mini-screw and 45° for left side) using a surgical guide fabricated from patients CBCT and intraoral scans. The mini-screws were inserted at the attached gingiva bilaterally to achieve intrusion of upper anterior teeth with a power chain ligated from the main archwire to the anterior min-implants. The patient was recalled monthly for orthodontic appliance activation and screw assessment for 6 months. The intrusion force was 15 g on each side.
RESULTS: The results of the study showed that screw stability was higher in the male group than the female group at the 6th monthly follow-up visit with a statistically significant difference between both genders (P = .044). Concerning insertion angle, results showed a statistically significant difference between 45° and 90° as an insertion angle with a P-value <.01 in most of the follow-up months.
CONCLUSIONS: This study found that male patients with mini-screws inserted at 90° showed greater screw stability over time.
METHODS: Twenty-nine patients (18 Females and 11 Males) aged 18-40 years old were involved in the current study. A split-mouth design was carried out in which recruited patients needed bilateral anterior screws at the labial bone in the region of the incisor for the intrusion of upper anterior incisor teeth as part of their orthodontic treatment with a fixed appliance (upper right side received 90-degree insertion angle mini-screw and 45° for left side) using a surgical guide fabricated from patients CBCT and intraoral scans. The mini-screws were inserted at the attached gingiva bilaterally to achieve intrusion of upper anterior teeth with a power chain ligated from the main archwire to the anterior min-implants. The patient was recalled monthly for orthodontic appliance activation and screw assessment for 6 months. The intrusion force was 15 g on each side.
RESULTS: The results of the study showed that screw stability was higher in the male group than the female group at the 6th monthly follow-up visit with a statistically significant difference between both genders (P = .044). Concerning insertion angle, results showed a statistically significant difference between 45° and 90° as an insertion angle with a P-value <.01 in most of the follow-up months.
CONCLUSIONS: This study found that male patients with mini-screws inserted at 90° showed greater screw stability over time.
摘要：
目的：前牙侵入是口腔正畸的常规手术，在前部区域的微型螺钉的帮助下进行了有效的操作，尤其是上颌骨.本研究旨在探讨插入角度和社会人口统计学特征对上颌前区微型螺钉成功率的影响。
方法：本研究涉及29名患者（18名女性和11名男性），年龄为18-40岁。进行了裂口设计，招募的患者需要在门牙区域的唇骨处使用双侧前螺钉，以侵入上前门牙，作为使用固定矫治器进行正畸治疗的一部分（右上侧接受90度插入角微型螺钉，左侧为45°）使用由患者CBCT和口内扫描制成的手术指南。将微型螺钉双侧插入附着的牙龈，以通过从主弓丝结扎到前最小植入物的动力链实现上前牙的侵入。每月对患者进行6个月的正畸矫治器激活和螺钉评估。每一侧的侵入力为15g。
结果：研究结果表明，在第6个月的随访中，男性组的螺钉稳定性高于女性组，两种性别之间的差异具有统计学意义（P=.044）。关于插入角度，结果显示，在大多数随访月中，45°和90°作为插入角度的差异具有统计学意义，P值<.01。
结论：这项研究发现，以90°插入微型螺钉的男性患者随着时间的推移表现出更大的螺钉稳定性。
方法：本研究涉及29名患者（18名女性和11名男性），年龄为18-40岁。进行了裂口设计，招募的患者需要在门牙区域的唇骨处使用双侧前螺钉，以侵入上前门牙，作为使用固定矫治器进行正畸治疗的一部分（右上侧接受90度插入角微型螺钉，左侧为45°）使用由患者CBCT和口内扫描制成的手术指南。将微型螺钉双侧插入附着的牙龈，以通过从主弓丝结扎到前最小植入物的动力链实现上前牙的侵入。每月对患者进行6个月的正畸矫治器激活和螺钉评估。每一侧的侵入力为15g。
结果：研究结果表明，在第6个月的随访中，男性组的螺钉稳定性高于女性组，两种性别之间的差异具有统计学意义（P=.044）。关于插入角度，结果显示，在大多数随访月中，45°和90°作为插入角度的差异具有统计学意义，P值<.01。
结论：这项研究发现，以90°插入微型螺钉的男性患者随着时间的推移表现出更大的螺钉稳定性。
