BACKGROUND Protraction of maxilla is usually the preferred and more commonly used treatment approach for skeletal Class III with a retrognathic maxilla. The aim of this study was the comparison of the skeletal and dental effects of two skeletally borne appliances for maxillary protraction: a) Hybrid-Hyrax in combination with facemask (FM), b) Hybrid-Hyrax in combination with Mentoplate (ME). METHODS Thirty four Patients (17 facemask, 17 Mentoplate) were investigated by means of pre- and posttreatment cephalograms. The two groups matched with regard to treatment time, age gender and type of dentoskeletal deformity before treatment. RESULTS Both groups showed a significant forward movement of A-point (FM GROUP: SNA + 2.23° ± 1.30°- p 0.000*; ME: 2.23° ± 1.43°- p 0.000*). B-Point showed a larger sagittal change in the FM Group (SNB 1.51° ± 1.1°- p 0.000*) compared to the ME group (SNB: - 0.30° ± 0.9°- p 0.070). The FM group showed a significant increase of the ML-NL + 1.86° ± 1.65° (p 0.000*) and NSL-ML + 1.17° ± 1.48 (p 0.006*). Upper Incisor inclination did not change significantly during treatment in both groups as well as the distance of the first upper Molar in relation to A-point. CONCLUSION Both treatments achieve comparable rates of maxillary protraction, without dentoalveolar side effects. Skeletal anchorage with symphysial plates in the mandible provides greater vertical control and might be the treatment of choice in high angle patients.

中文翻译：

---

早期使用Hybrid-Hyrax进行III类治疗-面膜与Hybrid-Hyrax-Mentoplate相比-骨骼和牙齿的预后。

背景技术上颌前突通常是具有逆颌上颌骨的III类骨骼的首选且更常用的治疗方法。这项研究的目的是比较两种骨骼承载的器具对上颌牵引的骨骼和牙齿效应：a）混合式六面体与面罩（FM）组合，b）混合式六面体与Mentoplate（ME）组合。方法对34例患者（17例面罩，17例Mentoplate患者）进行了治疗前后的脑电图检查。两组在治疗时间，年龄性别和治疗前牙骨畸形的类型方面相匹配。结果两组均显示A点明显向前运动（FM组：SNA + 2.23°±1.30°-p 0.000 *； ME：2.23°±1.43°-p 0.000 *）。B点显示FM组的矢状面变化更大（SNB 1.51°±1。相较于ME组（SNB：-0.30°±0.9°-p 0.070），则为1°-p 0.000 *）。FM组的ML-NL + 1.86°±1.65°（p 0.000 *）和NSL-ML + 1.17°±1.48（p 0.006 *）显着增加。两组的治疗过程中，上切牙的倾斜度以及第一上磨牙相对于A点的距离均无明显变化。结论两种治疗方法均可达到相当的上颌牵引率，且无牙槽膜副作用。下颌骨中有共骨板的骨骼锚固提供了更好的垂直控制，可能是高角度患者的首选治疗方法。两组的治疗过程中，上切牙的倾斜度以及第一上磨牙相对于A点的距离均无明显变化。结论两种治疗方法均可达到相当的上颌牵引率，且无牙槽膜副作用。下颌骨中有共骨板的骨骼锚固提供了更好的垂直控制，可能是高角度患者的首选治疗方法。两组的治疗过程中，上切牙的倾斜度以及第一上磨牙相对于A点的距离均无明显变化。结论两种治疗方法均可达到相当的上颌牵引率，且无牙槽膜副作用。下颌骨中有共骨板的骨骼锚固提供了更好的垂直控制，可能是高角度患者的首选治疗方法。