Beijing Da Xue Xue Bao Yi Xue Ban. 2017 Jun 18;49(3):531-539.
To evaluate the clinical effect of distalizing mandibular dentition with micro-implant in patients with skeletal class III malocclusion.
In the study, 20 patients with skeletal class IIImalocclusion were selected. They are consist of 8 males and 12 female with an age range from 16 to 38 years old and an average age of (21.5±5.6) years.They were treated with straight wire technique and the implant were inserted into the mandibular external oblique line to distlize the lower dentition to a class I molar relationships. Cephalometrics films were taken before and after treatment. The changes of hard tissue and soft tissue were analyzed by evaluating 26 measurement measurements.
Class I molar relationships were achieved, and the profile were improved after treatment. ANB increased by (0.80±1.02) °,Wits increased by (1.67±1.74) mm,after treatment (P<0.05). The lower dentition were significantly retracted after treatment with L1-NB distance decreased by(2.64±1.50) mm, P<0.05; the mesial buccal cusp and mesial root of the lower first molars were retracted by (3.26±1.95) mm and (0.79±1.27) mm respectively (P<0.05); the mesial buccal cusp of the lower second molars were retracted by (3.06±1.80) mm (P<0.05). After treatment, mandibular teeth got up-righted distally. From incisors to molar, L1/MP, L5/MP, L6/MP, L7/MP angle decreased by (6.37±8.53)°, (10.59±8.50)°, (11.48±7.22)°, (15.72±7.16)°on average respectively (P<0.05), all of those changes had the statically significant effects. Soft tissue change after treatment, the distance from lower lip to esthetic plane were decreased by (1.70±1.59) mm on average (P<0.05).
Distalizing mandibular dentition with micro-implant can get an satisfying result in patients with skeletal class III malocclusion, the lower teeth were retracted by controlled tipping movement.
评估微型种植体远移下颌牙列矫治骨性III类错牙合畸形患者的临床疗效。
选取20例骨性III类错牙合畸形患者，其中男性8例，女性12例，年龄16～38岁，平均年龄（21.5±5.6）岁。采用直丝弓技术，在下颌外斜线植入种植体远移下牙列至I类磨牙关系。治疗前后拍摄头影测量片，通过26项测量指标分析硬组织和软组织的变化。
治疗后达到I类磨牙关系，面型改善。治疗后ANB增加（0.80±1.02）°，Wits增加（1.67±1.74）mm（P<0.05）。下牙列明显内收，治疗后L1-NB距离减少（2.64±1.50）mm，P<0.05；下颌第一磨牙近中颊尖及近中牙根分别内收（3.26±1.95）mm和（0.79±1.27）mm（P<0.05）；下颌第二磨牙近中颊尖内收（3.06±1.80）mm（P<0.05）。治疗后下颌牙齿远中直立。从切牙至磨牙，L1/MP、L5/MP、L6/MP、L7/MP角平均分别减小（6.37±8.53）°、（10.59±8.50）°、（11.48±7.22）°、（15.72±7.16）°（P<0.05），所有这些变化均有统计学意义。治疗后软组织改变，下唇至审美平面的距离平均减少（1.70±1.59）mm（P<0.05）。
微型种植体远移下颌牙列矫治骨性III类错牙合畸形患者可取得满意效果，下牙通过控根移动实现内收。
