Angle Orthod. 2021 Jan 1;91(1):88-97. doi: 10.2319/020520-82.1.
To use both absolute anteroposterior maxillary complex length (APMCL) and relative APMCL to investigate the relationship between the maxillary complex, its individual bony segments, and their association to the anterior cranial base. In addition, the relationship between length and position of the maxillary complex was analyzed.
Sixty human skulls were analyzed using cone beam computed tomography. The maxillary complex length was measured between anterior and posterior nasal spine (ans-pns), and the average was used as the cut-off to identify a high- and a low-length group based on absolute APMCL. The length ratio between the maxillary complex and the anterior cranial base (ans-pns/SN) was used to identify the two groups based on relative APMCL. The anterior cranial base length and the lengths of the maxillary complex bones were compared between the high- and low-length groups.
Based on absolute APMCL, individuals with shorter maxillary complex had shorter anterior cranial base (P = .003), representing normal proportions. Based on relative APMCL, individuals with shorter maxillary complex had longer anterior cranial base and vice versa (P = .014), indicating disproportions. Individuals with shorter maxillary complex exhibited shorter maxilla (Δ = -1.5 mm, P = .014).
When skeletal deformity of the midface is suspected, individual disproportions in the anteroposterior length of the maxillary complex in relation to the anterior cranial base (relative measurements) should be assessed through radiological imaging. A shorter maxillary complex may be associated with a shorter maxilla, and not with a shorter premaxilla or palatine bone.
使用绝对上颌复合体前后长度（APMCL）和相对 APMCL 来研究上颌复合体与其各个骨段之间的关系，以及它们与前颅底的关系。此外，还分析了上颌复合体长度与位置之间的关系。
使用锥形束 CT 对 60 个人颅骨进行分析。上颌复合体长度在鼻前棘（ans-pns）和后鼻棘（pns）之间进行测量，平均长度作为截断值，根据绝对 APMCL 将其分为高长度组和低长度组。根据相对 APMCL，使用上颌复合体与前颅底（ans-pns/SN）的长度比来识别两组。比较高长度组和低长度组之间的前颅底长度和上颌复合体骨长度。
根据绝对 APMCL，上颌复合体较短的个体前颅底较短（P =.003），代表正常比例。根据相对 APMCL，上颌复合体较短的个体前颅底较长，反之亦然（P =.014），表明比例失调。上颌复合体较短的个体上颌骨较短（Δ = -1.5 毫米，P =.014）。
当怀疑面中部骨骼畸形时，应通过影像学评估上颌复合体前后长度与前颅底之间的个体比例失调（相对测量）。较短的上颌复合体可能与较短的上颌骨有关，而不是与较短的上颌前突或腭骨有关。
