摘要
目的分析拔除下颌第三磨牙矫治骨性Ⅲ类错拾畸形后患者牙猞面的变化,探讨该矫治模式的适应证、疗效和临床意义。方法选择处于生长发育减速期和结束期的骨性Ⅲ类错猞畸形患者19例(女性16例,男性3例),拔除下颌第三磨牙,配合摇椅形弓和短Ⅲ类牵引技术矫治骨性Ⅲ类错拾畸形。通过头影测量对患者治疗前后的骨骼和牙齿变化进行评估,并进行配对t检验。结果治疗后下颌切牙和磨牙发生明显的舌向移动,下切牙至Y轴的距离南治疗前的65.96mm减至治疗后的63.98mm,向远中移动(1.98±1.36)nlm。下颌第一磨牙至Y轴的距离由治疗前的43.00mm减至治疗后的39.84mm,向远中移动(3.16±1.23)mm。矫治后下颌第一磨牙向远中倾斜(12.37±6.81)。,前牙覆盖增加(2.75±1.65)mm,矫治前后差异有统计学意义(P〈0.05)。结论拔除下颌第三磨牙配合摇椅形弓和短Ⅲ类牵引技术可明显远中移动下颌磨牙和切牙。
Objective To assess the skeletodental changes after extracting mandibular third molars in skeletal ClassⅢpatients in both post-puberty and adult. Methods Nineteen skeletal Class Ⅲ patients in post-puberty or adult (16 female, 3 male ) successfully treated with extracting mandibular third molars were included in the study. Cephalograms were analyzed to assess the skeletal and dental changes before and after treatment. Paired t-test was performed for statistical analysis of the data. Results The results revealed that the main changes were upright[ (12. 37 ± 6. 81 )°] and distal movement[(3. 16 ± 1.23 ) mm] of the mandibular molars, and retraction[ ( 1.98 ± 1.36) mm] of the mandibular incisors. There was a significant improvement in overjet [ ( 2. 75 ± 1.65 ) mm ] . Conclusions The lower molars and incisors could be distalized significantly with extraction of the lower third molars.
出处
《中华口腔医学杂志》
CAS
CSCD
北大核心
2011年第5期286-289,共4页
Chinese Journal of Stomatology
关键词
错袷
安氏Ⅲ类
正畸学
矫正
磨牙
第三
Malocclusion, Angle Class Ⅲ
Orthodontics, corrective
Molar, third