正畸治疗后牙弓稳定性的追踪研究

目的：探讨正畸治疗后牙弓的稳定性。方法：对正畸治疗后2－8年74例错He畸形患者治疗前后及保持后模型进行弓牙测量。结果：保持后，上基骨宽度较治疗后增加2．11％；上下6－6宽度、下基骨宽度没有显著性变化，其余均出现明显减少；减少百分率最大依次为上下3－3长度（7．79％，7．56％）、上下基骨长度（7．14％，5．12％）、上下牙弓长度（3．91％，3．37％）、上下3－3宽度（2．28％，3．30％）。结论：保持停止后，上下牙弓长度、基骨长度及3－3宽度有不断减少和3－3长度有回复治疗前水平的倾向，而6－6宽度较稳定。

The study on stability in dental arch out of retention of orthodontic treatment

ObjectiveTo investigate stability in dental arch out of retention of orthodontic treatment.MethodsThe dental arches were measured on Pre-,post-treatment and 2-8year out of retention study models of 74 cases with malocclusions.ResultsOut of retention, there was a significant increase in upper basal bone width( 2.11%) and no significant change in lower basal bone width and intermolar width on both jaws,whereas there was a significant decrease among others.Percentage reduction from more to less was intercanine length( 7.79%, 7.56%),basal bone length( 7.14%, 5.12%),dental arch length( 3.91%, 3.37%),intercanine width( 2.28%, 3.30%) on both jaws.ConclusionThere was a trend in continuing decrease in dental arch length, basal bone length and intercanine width and relapsing to pre-treatment original position in intercanine length,whereas intermolar width was more stable out of retention.