Department of Orthodontics, School of Dentistry, University of North Carolina, Chapel Hill, NC 27599-7450, USA.
Int J Oral Maxillofac Surg. 2010 Apr;39(4):327-32. doi: 10.1016/j.ijom.2010.01.012. Epub 2010 Feb 23.
In mandibular deficient patients, mandibular growth is not expected after the adolescent growth spurt, so mandibular advancement surgery is often carried out at 13 years. To test if the long-term stability for younger patients is similar to that for adult patients, the authors compared cephalometric changes from 1-year postsurgery (when changes due to the surgery should be completed) to 5-year follow up. 32 patients who had early mandibular advancement with or without simultaneous maxillary surgery (aged up to 16 for girls and 18 for boys), and 52 patients with similar surgery at older ages were studied. Beyond 1-year postsurgery, the younger patients showed significantly greater change in the horizontal and vertical position of points B and pogonion, the horizontal (but not vertical) position of gonion, and mandibular plane angle. 50% of younger patients had 2-4mm backward movement of Pg and another 25% had >4mm. 15% of older patients had 2-4mm change and none had >4mm. Long-term changes in younger patients who had two-jaw surgery were greater than for mandibular advancement only. Changes in younger groups were greater than for adult groups. Satisfaction with treatment and perception of problems were similar for both groups.
在下颌骨发育不全的患者中，下颌骨在青春期生长突增后不会继续生长，因此下颌骨前伸术通常在 13 岁进行。为了测试年轻患者的长期稳定性是否与成年患者相似，作者比较了从术后 1 年（手术引起的变化应完成时）到 5 年随访时的头影测量变化。研究了 32 名接受早期下颌骨前伸术（女孩年龄最大为 16 岁，男孩年龄最大为 18 岁）或同期上颌骨手术的患者，以及 52 名年龄较大时接受类似手术的患者。术后 1 年以上，年轻患者的 B 点和颏顶点的水平和垂直位置、下颌角的水平（但不是垂直）位置以及下颌平面角的变化明显更大。50%的年轻患者 Pg 后移 2-4mm，另有 25%的患者后移>4mm。15%的年长患者有 2-4mm 的变化，没有>4mm的变化。接受双颌手术的年轻患者的长期变化大于仅接受下颌前伸术的患者。年轻组的变化大于成年组。两组患者对治疗的满意度和对问题的认知相似。
