摘要
目的 :采用锥形束CT(CBCT)研究单侧尖牙阻生病例牙颌的三维结构特征,评估发生上颌尖牙阻生的相关风险因素,为正畸临床早期干预提供依据。方法:选取30例单侧上颌尖牙阻生患者的CBCT,利用Romexis软件进行三维重建,测量、比较两侧牙颌三维结构特征指标,采用SPSS17.0软件包进行配对t检验和相关数据的回归分析。结果:阻生侧尖牙和侧切牙倾斜度明显增大,尖牙牙冠更向近中、侧切牙向远中倾斜(P<0.001);阻生侧尖牙体积更大、侧切牙体积更小(P<0.05),当尖牙体积增大或侧切牙体积减小时,上颌尖牙的阻生概率增加;阻生侧牙弓弧形长度更短,牙弓宽度在尖牙区和前磨牙区更短(P<0.001),而宽度在磨牙区无显著差异(P>0.05),两侧牙弓长度在尖牙区、前磨牙区和磨牙区无显著差异(P>0.05)。结论:上颌尖牙阻生伴随或导致同侧牙及牙槽骨三维方向发育异常,上颌尖牙阻生的严重程度与周围牙颌结构异常密切相关,提示上颌尖牙阻生可以早期预判、诊断,且可以实施有效的早期干预。
PURPOSE： To investigate the three-dimensional structure characteristics of unilateral impacted teeth by cone-beam CT（CBCT）, and to evaluate the risk factors for upper impacted teeth, so as to provide evidence for early clinical intervention in orthodontics. METHODS： Thirty patients with unilateral maxillary canine impaction were included. Their CBCT images were measured by three-dimensional reconstruction of Romexis software. The differences of the three-dimensional structure characteristics between two sides were measured and compared with SPSS17.0 software package. Paired t test and regression analysis of related data were performed. RESULTS： Significant difference in inclination of both canine and lateral incisor was found between impacted side and normal eruption side, with canine mesially inclined and lateral incisor distally inclined（P〈0.001）. Volumes of the canines were significantly bigger and those of the lateral incisor were significantly smaller on the impacted side compared with the normal eruption side（ P〈0.05）. The occurrence of impacted canine increased with the increase of the volume of the canine and decrease of the volume of the lateral incisor. Significant difference in arch length and arch width in canine and premolar area was found between impacted side and normal eruption side（P〈0.001）. There was no significant difference in width in molar area between both sides（P 〉0.05）. There was no significant difference in arch length in canine, premolar and molar region（ P 〉0.05）.CONCLUSIONS： Maxillary impacted canines can lead to three-dimensional abnormalities of the ipsilateral teeth and alveolar bone, the severity of maxillary impacted canine is closely related to surrounding dental structural abnormalities,suggesting that maxillary impacted canines can be predicted, early diagnosed, and early effectively intervened as well.
出处
《上海口腔医学》
CAS
CSCD
北大核心
2018年第1期79-84,共6页
Shanghai Journal of Stomatology
关键词
上颌阻生尖牙
牙颌畸形
锥形束CT
三维测量
Upper impacted canine
Dentofacial malformation
Cone-beam CT
Three-dimensional measurement
