The purpose of this research was to compare the reliability of two different methods for cranial midline localization through cephalometric analysis of mandibular condyle asymmetries. A retrospective cohort study was performed analyzing consecutively the SMV radiograms of 47 patients undergoing oral surgery before orthodontic treatment at the Dental School, University of Trieste (Italy) from 2003 to 2008. Two different cephalometric analyses were used to identify the basicranium midline (Tracing 1: initial landmarks = craniostat ear rods; Tracing 2: initial landmarks = spinosum foramina), and the left/right symmetry ratio (SR) for four parameters (condylar length, condylar angle, intra-condylar hemidistance, extra-condylar hemidistance) was calculated. The main result showed that no significant statistical difference between the SRs of the intra-condylar and extra-condylar hemidistance obtained with the same tracing was found (t-test; P = NS; C.I. 95%). Conversely, the difference between the SRs obtained with the two different tracings was statistically significant (t-test; P < 0.000; C.I. 95%). In conclusion, if the analysis of condylar asymmetries is performed in growing subjects, utilization of anatomic references such as the neurovascular foramina seems to guarantee a lower error compared to non-fixed references such as ear rods.
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机译：本研究的目的是通过对下颌con突不对称的头颅测量分析，比较两种不同的颅中线定位方法的可靠性。一项回顾性队列研究连续分析了2003年至2008年在意大利的里雅斯特大学牙科学院正畸治疗之前接受口腔手术的47例接受口腔手术的患者的SMV放射线图。使用了两种不同的头颅测量分析方法来识别基本中线（追踪1）。 ：初始界标=颅骨节律器耳棒；迹线2：初始界标=棘皮孔），并计算四个参数（con长度，con角度，-内半张性，-外半张性）的左右对称比（SR） 。主要结果表明，在相同描tra法下获得的con内和ist外半指的SR之间没有统计学差异（t检验； P = NS； C.I。95％）。相反，通过两种不同的描记获得的SR之间的差异具有统计学意义（t检验； P <0.000； C.I。95％）。总之，如果在成长中的受试者中进行con突不对称的分析，则与非固定参照物（例如耳标）相比，使用解剖参照物（例如神经血管孔）似乎可以保证较低的误差。
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