Department of Orthodontics, University of North Carolina, Chapel Hill, NC, USA.
Am J Orthod Dentofacial Orthop. 2011 Jun;139(6):815-822.e1. doi: 10.1016/j.ajodo.2010.04.032.
The purpose of this article is to present further longitudinal data for short-term and long-term stability, following up our previous article in the surgery literature with a larger sample and 2 years of stability data.
Data from 38 patients enrolled in this prospective study were collected before treatment, at maximum expansion, at removal of the expander 6 months later, before any second surgical phase, at the end of orthodontic treatment, and at the 2-year follow-up, by using posteroanterior cephalograms and dental casts.
With surgically assisted rapid palatal expansion (SARPE), the mean maximum expansion at the first molar was 7.60 ± 1.57 mm, and the mean relapse was 1.83 ± 1.83 mm (24%). Modest relapse after completion of treatment was not statistically significant for all teeth except for the maxillary first molar (0.99 ± 1.1 mm). A significant relationship (P < 0.0001) was observed between the amount of relapse after SARPE and the posttreatment observation. At maximum, a skeletal expansion of 3.58 ± 1.63 mm was obtained, and this was stable.
Skeletal changes with SARPE were modest but stable. Relapse in dental expansion was almost totally attributed to lingual movement of the posterior teeth; 64% of the patients had more than 2 mm of dental changes. Phase 2 surgery did not affect dental relapse.
本文旨在呈现短期和长期稳定性的进一步纵向数据，我们在前一篇发表于外科文献的文章的基础上，扩大了样本量并增加了 2 年的稳定性数据。
本前瞻性研究共纳入 38 例患者，通过头颅侧位片和牙模收集治疗前、最大扩张时、扩张器 6 个月后取出时、任何二期手术前、正畸治疗结束时和 2 年随访时的数据。
采用手术辅助快速腭扩张术（SARPE），第一磨牙的平均最大扩张量为 7.60 ± 1.57mm，平均复发量为 1.83 ± 1.83mm（24%）。除上颌第一磨牙（0.99 ± 1.1mm）外，所有牙齿的治疗后复发量均较小，无统计学意义。SARPE 后复发量与治疗后观察时间之间存在显著相关性（P<0.0001）。最大时获得了 3.58 ± 1.63mm 的骨骼扩张，且稳定。
SARPE 引起的骨骼变化虽小但稳定。牙扩张的复发几乎完全归因于后牙的舌向移动；64%的患者牙变化超过 2mm。二期手术并不影响牙的复发。
