Hong Vo Thi Thuy, Lien Tran Thi Kim, Tuan Pham Anh, Viet Hoang
Department of Orthodontics, National Hospital of Odonto-Stomatology, Hanoi, Vietnam.
Department of Odontology, Military Hospital 103, Hanoi, Vietnam.
J Orthod Sci. 2024 Nov 25;13:44. doi: 10.4103/jos.jos_35_24. eCollection 2024.
To evaluate the effectiveness of mini-implant (MI) anchorage versus conventional anchorage for the treatment of skeletal class II malocclusion.
The study was conducted on 64 patients with skeletal class II malocclusion. The patients were divided into two groups: 1) 32 patients underwent conventional anchorage, and 2) 32 patients underwent MI anchorage. Cephalometric radiographs were taken pre-treatment, and the data were compared with post-treatment measurements.
The age and gender distribution between the conventional and MI anchorage groups was similar, and the differences were statistically significant. The SNA and SNB angles post-treatment were reduced compared to pre-treatment measurements in both groups. The MI anchorage demonstrated a superior subsidence effect, reducing the level of forward displacement of the first molars in the maxilla. The MI group also exhibited less extrusion of the molars compared to the conventional group. In skeletal class II cases, especially in patients with a high mandibular angle using MI anchorage helped prevent the mandible from rotating counterclockwise, thus improving aesthetics rather than worsening them after treatment. In 75% of the cases in the MI anchorage group, the outcome was assessed as "greatly improved" based on the PAR index.
MI anchorage was more effective than conventional anchorage. It allows for greater posterior movement and intrusion of the maxillary incisors while maintaining or rotating the mandibular plane counterclockwise.
评估微型种植体（MI）支抗与传统支抗治疗骨性II类错牙合畸形的有效性。
对64例骨性II类错牙合畸形患者进行研究。患者分为两组：1）32例患者采用传统支抗，2）32例患者采用MI支抗。治疗前拍摄头影测量X线片，并将数据与治疗后测量结果进行比较。
传统支抗组和MI支抗组之间的年龄和性别分布相似，差异具有统计学意义。两组治疗后的SNA和SNB角均较治疗前测量值减小。MI支抗表现出更好的下沉效果，减少了上颌第一磨牙的前移水平。与传统组相比，MI组磨牙的伸长也更少。在骨性II类病例中，尤其是下颌角较大的患者，使用MI支抗有助于防止下颌逆时针旋转，从而改善美观而非治疗后使其恶化。在MI支抗组75%的病例中，根据PAR指数评估结果为“显著改善”。
MI支抗比传统支抗更有效。它能使上颌切牙更大程度地向后移动和压低，同时保持下颌平面或使其逆时针旋转。
