摘要
目的:探究影响下颌阻生第三磨牙在正畸牵拉第二磨牙前移后自发性近中移动的影响因素,为临床磨牙缺失病例的矫治计划制定及效果预估提供理论依据。方法:选取2016~2023年就诊者于乌鲁木齐市口腔医院正畸科下颌第一磨牙拔除或缺失以及第二乳磨牙滞留伴先天缺失第二前磨牙的患者47例[12名男性,35名女性,平均年龄(17.36±3.69)岁],缺失磨牙数共计66颗。采用CBCT对治疗前(T0)和第二磨牙前移完成治疗后(T1)的影像数据进行精确测量、分析。采用线性回归分析方法,探讨影响第三磨牙自发性水平向近移变化量的相关因素。结果:正畸牵拉下颌第二磨牙牙冠和根分叉分别近中移动(5.61±2.46)mm和(6.28±3.19)mm。第三磨牙牙冠和根分叉处分别出现(5.16±2.00)mm和(4.47±2.72)mm的自发性近中移动。影响第三磨牙自发性近中移动相关因素有:第二磨牙牙冠水平移动距离(B=0.29,P<0.05),根分叉处移动距离(B=0.18,P<0.05),T0时第三磨牙的Nolla分期(B=0.23,P<0.05),正畸牵拉第二磨牙的近中移动所用时间(B=0.08,P<0.05)。结论:在正畸牵拉第二磨牙前移的治疗中下颌第三磨牙有自发性近中移动潜力,且下颌第三磨牙发育程度越高,第二磨牙后可用间隙越大、牵拉时间越长,第三磨牙自发性近中化移动程度越明显。
Objective:To investigate the factors associated with spontaneous mesialization of impacted third molars after second molar protraction.Methods:Forty-seven orthodontic patients[12 males and 35 females;mean age:(17.36±3.69)years]from Urumqi Stomatological Hospital treated with mandibular second molar protraction to close the space due to missing L-6 or L-E were selected,with the total number of missing molars was 66.The CBCT image data of mandibular second molar before treatment(T0)and after the anterior closure of missing space(T1)were accurately measured and analyzed.The correlation factors affecting the spontaneous mesial movement of the third molar were discussed by regression analysis.Results:Mandibular second molars were protracted by(5.61±2.46)mm and(6.28±3.19)mm measured at the crown and root furcation,respectively.After second molar protraction,third molars showed spontaneous mesialization by(5.16±2.00)mm and(4.47±2.72)mm,measured at the crown and root furcation,respectively.The distance of the second molar crown(P<0.05),the distance of the root furcation(P<0.05),Nolla’s stage of the third molar at T0(P<0.05)and second molar protraction time(P<0.05)were significantly associated with the amount of third molar mesialization.Conclusion:Greater third molar mesialization was observed when Nolla’s stage of the third molar was higher before treatment and when the second molar protraction distance and time was longer.
作者
范雅儒
孟庆芳
吴倩倩
FAN Yaru;MENG Qingfang;WU Qianqian(Department of Orthodontics,Urumqi Stomatological Hospital,Urumqi 830000,China)
出处
《口腔医学研究》
CAS
CSCD
北大核心
2023年第9期804-809,共6页
Journal of Oral Science Research
基金
新疆维吾尔自治区自然科学青年基金(编号:2021D01B19)。
关键词
下颌阻生第三磨牙
缺失磨牙
正畸牵拉
impacted third molar
missing posterior teeth
molar protraction
