Melsen B
Am J Orthod. 1978 May;73(5):526-40. doi: 10.1016/0002-9416(78)90242-7.
Two groups of ten patients with postnormal molar relation, identical as regards facial morphology and dental stage, were treated for 8 months with cervical traction of the Kloehn type. The extraoral arch of the headgear was tilted upward in relation to the occlusal plane in one group and downward in the other. The local tooth movements were measured and related to metal implants inserted in the jaws. The movement of the implants in relation to the anterior cranial base expressed the amount and direction of the sutural and condylar growth. It was shown that a normal molar relationship was established in the shortest time with a downward tilt of the extraoral bow. A pronounced distal tipping of the molars was observed in these patients. The growth direction of the maxilla during cervical treatment was downward and backward and the mandible rotated posteriorly. The children were observed again 7 to 8 years after treatment, and it appeared that the influence of the headgear on the growth pattern of the facial skeleton was reversible, as a pronounced anterior direction of growth of the maxilla as well as of the mandible was observed in all but two subjects.
两组各有十名患者，磨牙关系均为正常，面部形态和牙齿发育阶段相同，均接受了8个月的克洛恩（Kloehn）型颈部牵引治疗。在一组中，头帽的口外弓相对于咬合平面向上倾斜，另一组则向下倾斜。测量了局部牙齿移动情况，并将其与植入颌骨的金属种植体相关联。种植体相对于前颅底的移动反映了缝合处和髁突生长的量和方向。结果表明，口外弓向下倾斜时，能在最短时间内建立正常的磨牙关系。在这些患者中观察到磨牙有明显的远中倾斜。颈部治疗期间，上颌的生长方向是向下和向后，下颌则向后旋转。治疗7至8年后对这些儿童再次进行观察，结果显示，除两名受试者外，所有受试者的上颌和下颌均呈现出明显的向前生长方向，这表明头帽对面部骨骼生长模式的影响是可逆的。
