Bite-bumper配合固定矫治器矫治内倾型深覆的临床研究

目的探讨Bite-bumper配合固定矫治器矫治内倾型深覆打开咬合的机制及临床使用要点。方法对14名生长发育期的内倾型深覆患者，采用Bite-bumper配合固定矫正技术打开咬合，观察其临床疗效，并通过X线头影测量比较治疗前和咬合打开后有关硬组织的变化。结果1）14例患者打开咬合的时间平均为28 d；2）咬合打开后，颌骨矢状向（SNA、SNB、ANB）的变化无统计学差异，前后面高（S-Go、ANS-Me）增加，前后面高比值（S-Go/N-Me）、下颌平面角（SN-MP）、Y轴（Y axis）的变化无统计学差异，上下前牙唇倾（U1-SN、L1-MP）、切牙间角（U1-L1）减小，后牙（U6-PP，L6-MP）伸高，上切牙（U1-PP）压低，覆（overbite）减小。结论Bite-bumper配合固定矫正技术矫治内倾型深覆可快速打开咬合，并可改善内倾型深覆患者的短面型。

Clinical research of Bite-bumper combined with fixed appliance in treatment of lingual tipping deep bite

Objective To study the mechanism and applicability of Bite-bumper combined with fixed appliance in treatment of lingual tipping deep bite. Methods 14 children aged 12-16 years old with lingual tipping deep bite participated in the experiment. Bite-bumper combined with fixed appliance was used to correct the deep bite. Clinic effect was observed. Lateral cephalograms were taken before treatment and after bite opening. The related hard tissues were estimated through the cephalograms. Results 1）The average duration for bite-opening with Bite-bumper and fixed appliance of 14 patients was 28 days. 2）After bite-opening, the changes in length direction of jaw（SNA, SNB, ANB） had no statistical variances. Anterior and posterior facial height（S-Go, ANS-Me） were increased. No significant changes were observed in the ratio of posterior facial height to anterior facial height（S-Go/N-Me）, angle of mandibular plane（SN-MP） and Y axis. Labial incline in upper and lower incisors（U1-SN, L1-MP） and interincisa angle（U1-L1） were decreased. The posterior teeth（U6-PP, L6-MP） were extruded and the upper incisors（U1-PP） were intruded. The overbite was decreased. Conclusion Bite-bumper combined with fixed appliance can be used effectively for deep bite correction and improve the short face of patients with lingual tripping deep overbite.