Evaluation of the Ideal Horizontal X-Ray Beam Angulation to Accurately Identify Two Separate Canals in Maxillary First Premolars-A Retrospective Clinical Study Using Cone-Beam Computed Tomography in an Austrian Subpopulation

评估用于准确识别上颌第一前磨牙两个独立根管的理想水平X射线束角度——一项在奥地利亚人群中使用锥形束计算机断层扫描的回顾性临床研究