Angle Orthod. 2020 Jul 1;90(4):507-515. doi: 10.2319/082819-558.1.
To compare the effects of two different force magnitudes on maxillary posterior segment intrusion using mini-screws. The null hypothesis was that there would be no difference between the two force magnitudes.
Adult patients with skeletal open bite and a dental open bite ranging from 3 to 8 mm were recruited for this trial. The comparator group had 200 g of intrusive force applied for posterior segment intrusion, whereas 400 g of force was applied in the intervention group. Primary outcomes were the amount of posterior teeth intrusion and anterior open bite closure.
Twenty-two subjects were randomized to include 11 participants in each group. One participant dropped out in each group, leaving us with 10 subjects to be analyzed per group. There was statistically significant posterior teeth intrusion of 2.42 ± 2.06 and 2.26 ± 1.87 mm for the comparator and intervention groups, respectively, with no difference between them. Statistically significant open bite closure was achieved in both groups, measuring 2.24 ± 1.18 and 3.15 ± 1.06 mm in the comparator and intervention groups, respectively, with no difference between them.
Both the 200 g and 400 g intrusive forces yielded similar outcomes in terms of posterior teeth intrusion and anterior open bite closure.
比较两种不同力值大小对上颌后段骨段内收使用微型种植钉的影响。零假设为两种力值大小之间无差异。
本试验纳入患有骨骼性开颌和牙齿性开颌（范围 3-8mm）的成年患者。对照组施加 200g 的内收力，实验组施加 400g 的力。主要结局是后牙内收量和前牙开颌关闭量。
22 名受试者随机分为两组，每组 11 名。每组各有 1 名患者脱落，每组各有 10 名患者纳入分析。对照组和实验组后牙内收量分别为 2.42±2.06mm 和 2.26±1.87mm，差异无统计学意义。两组的前牙开颌均有显著关闭，对照组和实验组分别为 2.24±1.18mm 和 3.15±1.06mm，差异无统计学意义。
200g 和 400g 的内收力在后牙内收和前牙开颌关闭方面产生了相似的结果。
