Baratieri Carolina, Canongia Ana Carolina Portes, Bolognese Ana Maria
Federal University of Rio de Janeiro, RJ, Brazil.
Braz Dent J. 2011;22(2):146-50. doi: 10.1590/s0103-64402011000200010.
The aims of the present study were to evaluate the angulation and inclination of permanent maxillary incisors and to correlate the results to the intra-alveolar permanent maxillary canine position during mixed dentition, using cone beam computed tomography (CBCT). The subjects were 30 children aged 7 to 10 years in the inter-transitory period of mixed dentition (permanent incisors and first molars erupted; primary canines, first and second molars erupted; and permanent canines intraosseous). The CBCT scans were obtained and, using the Dolphin Imaging(®) software - version 11.0, 3D images were reconstructed and the measurements were performed. The angulation of the right and left lateral and central maxillary incisors was measured in relation to the sagittal plane and their inclination was measured in relation to the coronal plane. The intra-alveolar height of the right and left maxillary canines was measured from the cusp tip to the axial plane. Pearson's correlation at 5% significance level showed positive correlation between the canine height and the lateral incisor angulation. It was concluded that the intra-alveolar position of the maxillary canines has a direct influence on the angulation of maxillary incisors, especially the lateral incisors.
本研究的目的是使用锥形束计算机断层扫描（CBCT）评估恒牙上颌切牙的角度和倾斜度，并将结果与混合牙列期上颌恒尖牙在牙槽内的位置相关联。研究对象为30名7至10岁处于混合牙列过渡阶段的儿童（恒牙切牙和第一磨牙已萌出；乳尖牙、第一和第二乳磨牙已萌出；恒尖牙位于骨内）。获取CBCT扫描图像，并使用Dolphin Imaging(®)软件 - 11.0版本重建三维图像并进行测量。测量右上颌和左上颌侧切牙及中切牙相对于矢状面的角度以及相对于冠状面的倾斜度。测量右上颌和左上颌尖牙从牙尖到轴平面的牙槽内高度。在5%显著性水平下的Pearson相关性分析显示，尖牙高度与侧切牙角度之间呈正相关。研究得出结论，上颌尖牙在牙槽内的位置对上颌切牙尤其是侧切牙的角度有直接影响。
