Pirttiniemi P, Kantomaa T, Lahtela P
Institute of Dentistry, University of Oulu, Finland.
Eur J Orthod. 1990 Nov;12(4):408-13. doi: 10.1093/ejo/12.4.408.
The aim of this work was to examine the degree and direction of asymmetry in the condyle path, and its associations with facial and dental midline asymmetry in patients with treated and untreated unilateral cross-bite. The subjects were 22 patients, 16 female and 6 male, aged from 9 to 50 years. Nine patients had a history of treated unilateral cross-bite, the mean age of this group being 11.1 years. The children had been treated with removable or fixed expansion appliances at an age of 5-8 years. Thirteen patients had untreated unilateral cross-bite, their mean age being 23.4 years. The clinical examinations were performed by two orthodontists and standard PA roentgenograms were taken in a cephalostat. The condyle path was recorded from the inversion of a face bow fixed rigidly on the anterior mandibular teeth, the positions of the bow being first recorded with the teeth in maximal intercuspation and then in protrusion with the midline unchanged. The condyle path was found to be asymmetric in both the treated and untreated lateral cross-bite groups and to be steeper on the side of the diagnosed or treated cross-bite. The degree of asymmetry was found to be twice as great in the untreated as in the treated group. The facial asymmetry parameters describing the position of the mandible showed the strongest correlation with condyle path asymmetry. The results stress the importance of early treatment of lateral cross-bites.
本研究旨在探讨接受治疗和未接受治疗的单侧反牙合患者髁突路径不对称的程度和方向，以及其与面部和牙中线不对称的相关性。研究对象为22例患者，其中女性16例，男性6例，年龄在9至50岁之间。9例患者有接受过治疗的单侧反牙合病史，该组患者的平均年龄为11.1岁。这些儿童在5至8岁时接受了可摘式或固定式扩弓矫治器治疗。13例患者为未接受治疗的单侧反牙合，他们的平均年龄为23.4岁。临床检查由两名正畸医生进行，并在头颅定位仪上拍摄标准的全景X线片。髁突路径通过牢固固定在前下颌牙齿上的面弓倒置来记录，首先在牙齿最大咬合时记录面弓的位置，然后在中线不变的情况下向前伸时记录。结果发现，在接受治疗和未接受治疗的单侧反牙合组中，髁突路径均不对称，且在诊断或治疗反牙合的一侧更陡峭。未接受治疗组的不对称程度是接受治疗组的两倍。描述下颌位置的面部不对称参数与髁突路径不对称的相关性最强。结果强调了早期治疗单侧反牙合的重要性。
