摘要
目的应用锥形束CT分析不同垂直骨面型重度骨性Ⅲ类错[牙合]成人患者上下前牙牙冠与牙根所成的角度(冠根成角),为正畸治疗过程中上下前牙更安全而有效地移动提供参考依据。方法选取2012年1月至2021年1月于大连市口腔医院正畸科就诊的重度骨性Ⅲ类错[牙合]成人患者152例,根据下颌平面角分为高角组(53例)、均角组(52例)、低角组(47例),应用Invivo dental 5.0软件将所有患者的锥形束CT影像进行三维重建,测量并比较各组上下前牙的冠根角(CRA)和面轴角(SSA)。结果各组上下中切牙冠根成角总的比较,差异均有统计学意义(均P<0.05)。组间两两比较结果显示,上中切牙CRA和下中切牙SSA由大至小均依次为低角组、均角组和高角组,而下中切牙CRA和上中切牙SSA由大至小均依次为高角组、均角组和低角组,差异均有统计学意义(均P<0.05);其中,低角组上中切牙CRA>180°且SSA为负值。结论重度骨性Ⅲ类错[牙合]患者上下中切牙冠根成角在不同垂直骨面型之间有显著差异,其中高角和均角患者上中切牙冠相对牙根向舌侧倾斜,且高角患者更加明显;低角患者上中切牙与之相反,表现为牙冠相对牙根向唇向倾斜。3种骨面型患者的下中切牙牙冠相对牙根均向舌侧倾斜,且下颌平面角越小,其牙冠舌向倾斜越明显。
Objective Cone-beam CT(CBCT)is used to analyze the angle between the crown and root of the upper and lower anterior teeth in adult patients with severe skeletal ClassⅢof different vertical facial types(crown-root angulation),so as to provide a reference for the safe and effective movement of the upper and lower anterior teeth during orthodontic treatment.Methods A total of 152 patients with severe skeletal ClassⅢmalocclusion who were treated in the Orthodontics Department of Dalian Stomatological Hospital from January 2012 to January 2021 were selected.According to the mandibular plane angle,they were divided into three groups:high angle group(53 cases),average angle group(52cases)and low angle group(47 cases).The Invivo dental 5.0 software was used to reconstruct the cone-beam CT(CBCT)images in three dimensions,crown root angle(CRA)and facial axis angle(SSA)of upper and lower anterior teeth in each group were measured and compared.Results There were statistically significant differences in crown-root angulation of upper and lower central incisors in each group(all P<0.05).The results of pairwise comparison between groups showed that the CRA of upper central incisors and SSA of lower central incisors was largest in the low angle group,followed by average angle group and then high angle group,while the CRA of lower central incisors and SSA of upper central incisors was largest in the high angle group,followed by average angle group and then low angle group(all P<0.05).In the low angle group,the CRA of upper central incisors was>180°and the SSA was negative.Conclusion The crown-root angulation of maxillary and mandibular central incisors in patients with severe skeletal ClassⅢhas significant differences among different vertical bone types.In the high angle group and the average angle group,the crown of the upper and middle incisors inclines to the lingual side compared to the root,and the high angle group is more obvious,while the upper central incisors in the low angle group are on the contrary,and the crown inclines to the lip compared to the root.The crown of the lower central incisors in all three groups inclines to the lingual side compared to the root,and the smaller the mandibular plane angle,the more obvious the crown lingual inclination.
作者
翟俊辉
刘琳
王明锋
王茜
ZHAI Jun-hui;LIU lin;WANG Ming-feng;WANG Qian(Dalian Stomatology Hospital,Dalian 116021,China)
出处
《中国实用口腔科杂志》
CAS
2022年第4期425-428,共4页
Chinese Journal of Practical Stomatology
基金
大连市医学科学研究计划项目(1911085)
关键词
重度骨性Ⅲ类错[牙合]
不同垂直骨面型
上下前牙
冠根成角
锥形束CT
severe skeletal ClassⅢmalocclusion
different vertical facial skeletal type
upper and lower anterior teeth
crown-root angulation
cone-beam CT
