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对２００例儿童及成人口腔颌面部解剖标志与面部中线的关系测量分析表明：人中切迹点及唇珠点与面部中线的偏差较小，基本位于面部中线上，而上唇系带与面部中线的偏差较人中切迹点及唇珠点大，差别有显著性意义。天然牙切牙中缝并不都位于面部中线上，部分人有显著的偏斜。上唇系带常随天然牙切牙中缝的偏斜而偏斜。故不宜将上唇系带作为确定全口义齿中线的可靠标志，应以人中切迹，唇珠为标志，以保证人工牙排列与面部中线的统一，达到较好的美观效果。
Measurement and analysis of anatomic landmarks of the maxillofacial region in 200 children and adults and facial midline showed that there was little deviation between the notch points and the midpoint of the lips and the midline of the face. The upper lip ligament and the face The deviation of the midline is larger than the notch point and the bead point of the human, the difference is significant. Natural incisors and incisors are not located in the midline of the face, some people have significant bias. The upper lip lace often skewed with the skewness of the natural incisors. Therefore, the upper lip lace should not be used as a reliable indicator of the midline of the complete denture. It should be marked by the notch of the human being and the lip bead so as to ensure the uniform arrangement of the artificial tooth and the midline of the face so as to achieve a better aesthetic effect.