摘要
目的探讨高角Ⅱ类前牙开[牙合]患者的上下颌前牙牙根长度及中切牙冠根形态,为临床正畸治疗提供参考。方法本研究已通过单位伦理委员会审查批准,并获得患者知情同意。对81例高角Ⅱ类患者(前牙开[牙合]40例、正常覆[牙合]41例)正畸治疗前的锥形束CT(cone-beam computed tomography,CBCT)图像进行分析,运用Dolphin软件对上下颌前牙的牙根长度以及中切牙冠根形态进行研究,并行统计学分析。结果高角Ⅱ类开患者(开[牙合]组)与高角Ⅱ类正常覆患者(正常覆[牙合]组)的上颌尖牙和侧切牙牙根长度差异无统计学意义,但开[牙合]组上颌中切牙(11.12±1.37)mm、下颌中切牙(10.15±1.09)mm、下颌侧切牙(11.27±1.15)mm和下颌尖牙(12.81±1.48)mm的牙根长度均较正常覆[牙合]组短且差异均具有统计学意义(P<0.05);另一方面,开[牙合]组的上颌中切牙冠根成角(1.10°±3.62°)显著小于正常覆[牙合]组(4.53°±2.30°)(P<0.01),而开[牙合]组的下颌中切牙冠根成角与正常覆[牙合]组的差异无统计学意义。结论高角Ⅱ类开[牙合]患者的上下颌中切牙、下颌侧切牙和下颌尖牙牙根均较高角Ⅱ类正常覆[牙合]患者短,高角Ⅱ类开[牙合]患者上颌中切牙牙冠长轴相对于牙根长轴偏唇侧,冠根成角较小,利于开[牙合]患者的前牙转矩控制或内收移动。
Objective This study aimed to explore the root length of maxillary and mandibular anterior teeth and central incisor crown-root morphology in patients with high-angle skeletal Class Ⅱ open bite,aiming to provide a reference for clinical treatment.Methods This study was reviewed and approved by the Ethics Committee,and informed consent was obtained from the patients.CBCT images of eighty-one untreated patients(40 anterior open bite patients and 41 normal overbite patients)with high-angle skeletal Class Ⅱ malocclusion were selected before treatment.Dolphin software was used to study the root length of maxillary and mandibular anterior teeth and central incisor crown-root morphology,and the differences between the two groups were analyzed.Results There was no statistical significance in the root length of maxillary lateral incisor and canine between the open bite group and the normal overbite group,significant differences were found in the root length of maxillary central incisor(11.12±1.37)mm、mandibular central incisor(10.15±1.09)mm,mandibular lateral incisor(11.27±1.15)mm and mandibular canine(12.81±1.48)mm between the open bite group and the normal overbite group(P<0.05).On the other hand,the two groups were significantly different in crown-root morphology of the maxillary central incisor(1.10°±3.62°vs.4.53°±2.30°,P<0.01)but not in the mandibular central incisor.Conclusion The root length of the maxillary central incisor,mandibular central incisor,mandibular lateral incisor,mandibular canine in high-angle Class Ⅱ open bite patients is shorter than that in highangle Class Ⅱ normal overbite patients,and the long axis of the crown of the maxillary central incisor in high-angle Class Ⅱ open bite patients obviously deviates toward the labial side relative to the long axis of the root.The crown-root angle is smaller,which is beneficial to torque control or adduction movement of the anterior teeth in high-angle Class Ⅱ open bite patients.
作者
任庆源
包丽娜
周梦娇
伍春兰
REN Qingyuan;BAO Lina;ZHOU Mengjiao;WU Chunlan(Department of Orthodontics,Panyu Branch of Stomatological Hospital,School of Stomatology Southern Medical University,Guangzhou 511400,China;Department of Orthodontics,Affiliated Stomatological Hospital,Chongqing Medical University,Chongqing 401147,China)
出处
《口腔疾病防治》
2024年第3期196-201,共6页
Journal of Prevention and Treatment for Stomatological Diseases
基金
重庆市自然科学基金(CSTB2023NSCQ-BHX0240)
广东省医学科学技术研究基金项目(B2021380)。
关键词
高角
Ⅱ类错[牙合]
正畸
前牙开[牙合]
前牙
牙根长度
冠根形态
锥形束CT
high-angle
Class Ⅱ malocclusion
orthodontics
anterior open bite
anterior teeth
root length
crown-root morphology
cone-beam computed tomography
