Rune B, Sarnäs K V, Selvik G, Jacobsson S
Am J Orthod. 1982 Jan;81(1):65-70. doi: 10.1016/0002-9416(82)90290-1.
The study was undertaken to examine the effect of posteroanterior traction in an 11-year-old boy with maxillonasal dysplasia. Movement of the maxillary bones and of the mandible was recorded, by means of roentgen stereophotogrammetry, in relationship to the frontal bone during and after treatment. In the examined child face-mask therapy mainly influenced the position of the mandible while the recorded advancement of the maxillary bones was slight (0.6 mm.). It is possible that the limited maxillary response to traction may be due to insufficient growth capacity of the circummaxillary sutures in a child with maxillonasal dysplasia. While movement of the maxillary bones and of the mandible during traction conformed with the pattern of treatment effect described by Delaire a total maxillary relapse occurred in the posttreatment observation period (no retention), possibly in adaptation to the retropositioned mandible. In our patient, posteroanterior traction accomplished improvement of the maxillary retrusion in relationship to the mandible only.
本研究旨在探讨后前牵引对一名患有上颌鼻发育不良的11岁男孩的影响。通过X线立体摄影测量法记录治疗期间及治疗后上颌骨和下颌骨相对于额骨的移动情况。在所检查的患儿中，面罩治疗主要影响下颌骨的位置，而上颌骨记录到的前移幅度较小（0.6毫米）。上颌骨对牵引反应有限可能是由于患有上颌鼻发育不良的儿童上颌周围缝线的生长能力不足。虽然牵引过程中上颌骨和下颌骨的移动符合德莱尔描述的治疗效果模式，但在治疗后观察期（未进行保持）出现了上颌骨完全复发的情况，这可能是为了适应下颌骨的后缩位置。在我们的患者中，后前牵引仅改善了上颌骨相对于下颌骨的后缩情况。
