摘要
目的:对比研究正畸关闭陈旧性和非陈旧性磨牙间隙病例的牙根吸收情况,探讨关闭不同缺失时间的下颌第一磨牙缺隙对第二磨牙牙根吸收的影响。方法:25例存在下颌第一磨牙缺隙的患者为研究对象,按第一磨牙缺失时间不同分成2组。将研究病例矫治前后下颌第二磨牙的冠根比作配对t检验,判断其牙根吸收程度。结果:矫治后较矫治前两组均发生牙根吸收,关闭陈旧性磨牙间隙组牙根吸收程度较非陈旧性组大,但二组间差别无显著性。结论:正畸关闭陈旧性磨牙间隙并不会加重磨牙牙根的吸收。
Objective： To investigate the influence of different molar extraction time on apical root resorption during orthodontic space closure treatment and to see if the longer the extraction time of first molar the more serious root resorption of second molar will occur during orthodontic space closure treatment.Method： 25 subjects who had undergone mandibular first molar extraction were selected and divided into two groups according to the different molar extraction time. The apical resorption of mandibular second molars was measured on panoramic radiographys before and after treatment.Result： There were statistically significant differences in root resorption between pretreatment and posttreatment. However there seemed no statistically significant between groups no matter how long the molar has been extracted. Conclusion： Orthodontic treatment of closing the prolonged molar extracton space couldn＇t aggravated the root resorption of molars.
出处
《临床口腔医学杂志》
2007年第1期58-60,共3页
Journal of Clinical Stomatology
关键词
口腔正畸
磨牙
间隙关闭
牙根吸收
orthodontics
molar
space closure
root resorption
