利用锥体束CT对少年期中切牙根尖周牙槽骨厚度的研究

目的　研究少年期中切牙根尖唇舌侧牙槽骨厚度，并探讨与其相关的硬组织测量指标。方法　对42例符合纳入标准的错牙合畸形患者的锥体束CT（CBCT）进行评估，应用MIMICS 10.0软件测量168颗中切牙根尖唇舌侧牙槽骨厚度，并对42例患者进行CBCT三维和头颅侧位片二维头影测量，应用SPSS 21.0统计软件对中切牙根尖周牙槽骨厚度值与8项常用的硬组织头影测量指标进行Spearman 相关性分析。结果　少年期上中切牙根尖唇侧的牙槽骨厚度与上中切牙唇倾度呈正相关，与SNA角呈负相关，腭侧厚度的相关性与唇侧相反；下中切牙根尖唇、舌侧的牙槽骨厚度均与SN-MP角呈负相关，唇侧厚度与ANB角、下中切牙唇倾度呈正相关，腭侧厚度的相关性与唇侧相反。结论　头影测量中部分硬组织测量指标与少年期中切牙根尖周牙槽骨的厚度有相关性，对临床具有参考价值。

Study on alveolar bone thickness around apex of central incisor of early youth by cone beam computed tomography

Objective: To investigate the alveolar bone thickness around apex of central incisor of early youth, and to analyze the correlation with cephalometric measurement of hard tissue. Methods: To assess 42 malocclusion pations who were accordance with the inclusion criteria with cone-beam CT (CBCT), and to measure the thickness of alveolar bone around apex of the 168 central incisors with MIMICS 10.0 software. To do the cephalometric measurement of the 42 pations with CBCT three-dimensional and lateral cephalogram two-dimensional measurements, and the application of SPSS 21.0 statistical software was for the analysis of the correlationship between the thickness of alveolar bone and the results of cephalometric measurement. Results: The thickness of the labial Alveolar bone around apex of the upper central incisor of early youth is positively associated with the protrusion of the upper central insicor, and is negatively correlated with SNA. The situation of the palatal thickness is as opposed to the labial thickness. The thickness of the labial and lingual Alveolar bone around apex of the lower central incisor is negatively correlated with SN-MP.The labial thickness of the lower central incisor is positively associated with ANB and the protrusion of the lower central insicor, and the situation of the palatal thickness is as opposed to the labial thickness. Conclusion: Some cephalometric indexes of hard tissue are related to the Alveolar bone thickness around apex of central incisor of early youth, which has the clinical reference value.