Angle Orthod. 2020 Sep 1;90(5):627-633. doi: 10.2319/080619-516.
To evaluate the stability of maxillary interincisor diastema closure and the relationship between space relapse and interincisor diastema width, overjet, overbite, angulations between adjacent maxillary anterior teeth and presence of intermaxillary osseous cleft after orthodontic treatment with extractions.
Twenty-four individuals with a maxillary interincisor diastema pretreatment, treated with maxillary first premolar extractions were evaluated. Dental casts and panoramic radiographs taken at pretreatment (T1), posttreatment (T2), and posttreatment follow-up (T3) were assessed. Periapical radiographs at T1 and T2 were also evaluated. Diastema relapse was assumed when T3-T2 interincisor space change was greater than zero. Diastema relapse was considered clinically significant when it was at least 0.50 mm. Data were analyzed using repeated-measures analysis of variance followed by post hoc Tukey tests or Friedman followed by Wilcoxon tests. T-test or Mann-Whitney U-test, Pearson correlation coefficient, and multiple linear regression analyses were also performed.
No statistically significant relapse of maxillary interincisor diastemas was found. The percentage of clinically significant relapse of the maxillary interincisor diastemas was 27.78%. Specifically, for the interincisor midline diastema, it was 8.33%.
Maxillary interincisor diastema closure showed no statistically significant relapse after orthodontic treatment with premolar extractions. Clinically significant stability for maxillary interincisor diastema closure was 72.22% and, specifically, for interincisor midline diastema closure, it was 91.67%.
评估上颌切牙间间隙关闭的稳定性，以及间隙复发与切牙间间隙宽度、覆颌、覆盖、上颌前牙相邻角度和存在间骨质裂隙之间的关系。
评估 24 名上颌切牙间间隙治疗前、接受上颌第一前磨牙拔牙治疗的患者。评估治疗前（T1）、治疗后（T2）和治疗后随访（T3）的牙模和全景片，还评估 T1 和 T2 的根尖片。当 T3-T2 切牙间隙变化大于 0 时，认为发生了间隙复发。当复发至少为 0.50mm 时，认为间隙复发具有临床意义。使用重复测量方差分析，随后进行事后 Tukey 检验或 Friedman 检验后 Wilcoxon 检验，对数据进行分析。还进行了 t 检验或曼-惠特尼 U 检验、Pearson 相关系数和多元线性回归分析。
未发现上颌切牙间间隙有统计学意义的复发。上颌切牙间间隙具有临床意义的复发率为 27.78%。具体来说，对于切牙中线间隙，其复发率为 8.33%。
上颌切牙间间隙关闭后，在接受前磨牙拔牙治疗后，无统计学意义的复发。上颌切牙间间隙关闭的临床稳定性为 72.22%，特别是对于切牙中线间隙的关闭，其稳定性为 91.67%。
