New clues for early management of maxillary impacted central incisors based on 3-dimensional reconstructed models
New clues for early management of maxillary impacted central incisors based on 3-dimensional reconstructed models
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基于三维重建模型的上颌阻生中切牙早期治疗新线索
DOI：
10.1016/j.ajodo.2017.11.034
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发表时间：
2018-09-01
影响因子：
3
通讯作者：
Xu, Yue
中科院分区：
文献类型：
--
作者：
Lyu, Jiahong;Lin, Yi;Xu, Yue
简介：本研究旨在为上颌埋伏中切牙牙根撕裂伤的预防和早期治疗提供新的线索。研究方法：对108例单侧埋伏阻生上颌中切牙患者的锥形束CT图像进行三维重建。在矢状切面上测量冠向、冠高、牙根长度、骨厚度以及牙根撕裂的位置和角度。提出了用直根有效长度与理想直根长度之比来表示K值的概念，并研究了K值与根裂的关系。对侧萌出上颌切牙的牙根发育也进行了评估。资料分析采用独立样本t检定、卡方检定及单因子变异数分析。结果如下：当K值为0.16至0.19（腭嵌塞）、0.25至0.53（唇嵌塞）和0.69至0.75（鼻嵌塞）时，发生牙根撕裂。鼻、唇、腭阻生牙根纵裂的位置和角度不同（P
Introduction: The objective of this study was to provide new clues for the prevention and early management of root dilacerations in impacted maxillary central incisors. Methods: Cone-beam computed tomography images of 108 patients with unilateral impacted maxillary central incisors were obtained and reconstructed into 3-dimensional models. Crown direction, crown height, root length, bone thickness, and position and angle of root dilaceration were measured in the sagittal-view sections. K-value, defined as the ratio between the available length of the direct root and the ideal length of the direct root, was proposed, and the relationships between K-values with root dilacerations were studied. Root development of the contralateral erupted maxillary incisor was also assessed. Independent t test, chi-square test, and 1-way analysis of variance were used for data analysis. Results: Root dilacerations occurred when the K-values were 0.16 to 0.19 (palatal impaction), 0.25 to 0.53 (labial impaction), and 0.69 to 0.75 (nasal impaction). The position and angle of root dilacerations were different among nasal, labial, and palatal impactions (P