Univ de São Paulo - USP, School of Dentistry, Department of Stomatology, Division of Oral and Maxillofacial Radiology, São Paulo, SP, Brazil.
Braz Oral Res. 2013 Mar-Apr;27(2):128-35. doi: 10.1590/s1806-83242013005000003. Epub 2013 Mar 1.
The purpose of this study was to evaluate which post-processing imaging protocol would be better to analyze the additional mental foramen (AMF) in preoperative planning with cone-beam computed tomography (CBCT) exams, and to test reproducibility of measurements, using open source software (OsiriX). The software was used to detect the cases of AMF from among 58 exams for dental implant planning in edentulous mandible areas-three cases were found. The case images were submitted to qualitative analysis using 2D orthogonal MPR, 3D-MPR and 3D volume rendering protocols by two oral and maxillofacial radiologists. Quantitative analysis used the 3D-MPR protocol; the closed polygon tool measured the mental foramen (MF) and the AMF areas; the length tool measured the distance between foramina. The measurements were performed independently by the examiners, at two different times. Intra- and interexaminer agreement was assessed using the intraclass correlation coefficient. The panoramic view did not show the MF and the AMF clearly. The AMF could be detected in the parasagittal view. 2D Orthogonal MPR was effective to observe the AMF in some cases. The 3D-MPR and 3D view protocols were the most effective to locate and analyze the AMF. In conclusion, a 3D view improves visualization when anatomical points are not clearly visible. 3D-MPR was considered a more effective post-processing imaging protocol to observe foramina relationships. The high reproducibility of measurements for anatomical MF variations was established using specific tools featured in open source software for CBCT. OsiriX is realistic and recommended for preoperative planning.
本研究旨在评估在术前规划中使用锥形束计算机断层扫描（CBCT）检查时，哪种后处理成像方案更有利于分析额外的颏孔（AMF），并使用开源软件（OsiriX）测试测量的可重复性。该软件用于从 58 例下颌无牙区牙种植规划的 CBCT 检查中检测 AMF 病例——共发现 3 例。使用 2D 正交 MPR、3D-MPR 和 3D 容积再现协议对病例图像进行定性分析，由两名口腔颌面放射科医生进行。定量分析使用 3D-MPR 协议；闭合多边形工具测量颏孔（MF）和 AMF 区域；长度工具测量孔之间的距离。检查者在两次不同的时间独立进行测量。使用组内相关系数评估内部和检查者间的一致性。全景视图不能清晰显示 MF 和 AMF。在矢状位可以检测到 AMF。2D 正交 MPR 可有效观察某些情况下的 AMF。3D-MPR 和 3D 视图协议是定位和分析 AMF 的最有效方法。总之，3D 视图可改善在解剖点不清晰时的可视化效果。3D-MPR 被认为是观察孔关系的更有效的后处理成像方案。使用 CBCT 的开源软件中具有的特定工具，可对解剖学 MF 变化的测量进行高重复性评估。OsiriX 具有现实性，建议用于术前规划。
