Vanlaecken Robert, Williams Michael O, Razmus Thomas, Gunel Erdogan, Martin Chris, Ngan Peter
Department of Orthodontics, West Virginia University School of Dentistry, 1073 Health Science Center North, Morgantown 26506, WV, USA.
Prog Orthod. 2014 May 2;15(1):32. doi: 10.1186/s40510-014-0032-2.
A retrospective study was conducted to determine the cephalometric changes in a group of Class III patients treated with the inter-arch spring-loaded module (CS2000®, Dynaflex, St. Ann, MO, USA).
Thirty Caucasian patients (15 males, 15 females) with an average pre-treatment age of 9.6 years were treated consecutively with this appliance and compared with a control group of subjects from the Bolton-Brush Study who were matched in age, gender, and craniofacial morphology to the treatment group. Lateral cephalograms were taken before treatment and after removal of the CS2000® appliance. The treatment effects of the CS2000® appliance were calculated by subtracting the changes due to growth (control group) from the treatment changes.
All patients were improved to a Class I dental arch relationship with a positive overjet. Significant sagittal, vertical, and angular changes were found between the pre- and post-treatment radiographs. With an average treatment time of 1.3 years, the maxillary base moved forward by 0.8 mm, while the mandibular base moved backward by 2.8 mm together with improvements in the ANB and Wits measurements. The maxillary incisor moved forward by 1.3 mm and the mandibular incisor moved forward by 1.0 mm. The maxillary molar moved forward by 1.0 mm while the mandibular molar moved backward by 0.6 mm. The average overjet correction was 3.9 mm and 92% of the correction was due to skeletal contribution and 8% was due to dental contribution. The average molar correction was 5.2 mm and 69% of the correction was due to skeletal contribution and 31% was due to dental contribution.
Mild to moderate Class III malocclusion can be corrected using the inter-arch spring-loaded appliance with minimal patient compliance. The overjet correction was contributed by forward movement of the maxilla, backward and downward movement of the mandible, and proclination of the maxillary incisors. The molar relationship was corrected by mesialization of the maxillary molars, distalization of the mandibular molars together with a rotation of the occlusal plane.
进行了一项回顾性研究，以确定一组使用牙弓间弹簧加载模块（CS2000®，Dynaflex，美国密苏里州圣安妮）治疗的III类患者的头影测量变化。
连续治疗30名白种人患者（15名男性，15名女性），治疗前平均年龄为9.6岁，并与来自博尔顿-布拉什研究的对照组进行比较，该对照组在年龄、性别和颅面形态上与治疗组相匹配。在治疗前和拆除CS2000®矫治器后拍摄侧位头影测量片。CS2000®矫治器的治疗效果通过从治疗变化中减去生长引起的变化（对照组）来计算。
所有患者均改善为I类牙弓关系，覆盖为正值。在治疗前和治疗后的X线片之间发现了显著的矢状、垂直和角度变化。平均治疗时间为1.3年，上颌基骨向前移动0.8mm，而下颌基骨向后移动2.8mm，同时ANB和Wits测量值有所改善。上颌切牙向前移动1.3mm，下颌切牙向前移动1.0mm。上颌磨牙向前移动1.0mm，而下颌磨牙向后移动0.6mm。平均覆盖矫正量为3.9mm，其中92%的矫正归因于骨骼因素，8%归因于牙齿因素。平均磨牙矫正量为5.2mm，其中69%的矫正归因于骨骼因素，31%归因于牙齿因素。
使用牙弓间弹簧加载矫治器可以矫正轻度至中度III类错牙合，患者依从性要求最低。覆盖矫正归因于上颌向前移动、下颌向后和向下移动以及上颌切牙前倾。磨牙关系通过上颌磨牙近中移动、下颌磨牙远中移动以及咬合平面旋转来矫正。
