Bock Niko C, Saffar Mitra, Hudel Helge, Evälahti Marjut, Heikinheimo Kaisa, Rice David P, Ruf Sabine
Department of Orthodontics, University of Giessen, Giessen, Germany.
Private Practice, Mainz, Germany.
Eur J Orthod. 2018 Sep 28;40(5):488-495. doi: 10.1093/ejo/cjx091.
To investigate the outcome quality and the long-term (≥15 years) post-treatment (Tx) changes after Class II:2 Herbst-multibracket appliance (MBA) Tx.
In this longitudinal observational study, a recall of Class II:2 patients who had been treated by a Herbst-MBA during adolescence was conducted. Study models from before and after active Tx, after retention and after recall were assessed using standard occlusal variables and the peer assessment rating index (PAR). These data were compared to historical untreated Class I controls.
Twenty out of 33 patients (61%) could be located and participated at age 33.9 ± 2.7 years. When comparing their data to the 13 patients who did not participate, the pre- and post-Tx occlusal findings did not differ systematically; however, the PAR scores of the non-participants were by 3.3-8.2 points higher at all times and the non-participants were 2.1-2.5 years older. Pre-Tx at age 14.4 ± 2.7 years, the participants showed the following mean values: PAR = 15.0 ± 7.0, Class II molar relationship (MR) = 0.8 ± 0.3 cusp widths (cw), overbite = 5.3 ± 1.3 mm. After Tx, a PAR score of 2.9 ± 1.3 and a super Class I MR (-0.1 ± 0.1 cw) with normal overbite (1.2 ± 0.8 mm) existed. At recall, a PAR score increase to 5.9 ± 3.6 points had occurred, mainly caused by an increase of overbite to 2.5 ± 1.5 mm. The average MR remained Class I (0.0 ± 0.2 cw). For all variables, the untreated controls exhibited similar findings.
The occlusal outcome of Class II:2 Herbst-MBA Tx exhibited very good long-term stability. While mild post-Tx changes occurred, the long-term findings are similar to untreated Class I controls.
研究Ⅱ类2分类错 畸形患者使用Herbst多托槽矫治器（MBA）治疗后的疗效质量及治疗后长期（≥15年）变化情况。
在这项纵向观察研究中，对青春期接受过Herbst-MBA治疗的Ⅱ类2分类患者进行回访。使用标准咬合变量和同行评估评分指数（PAR）评估主动治疗前后、保持后及回访后的研究模型。将这些数据与未经治疗的Ⅰ类错 畸形历史对照进行比较。
33例患者中有20例（61%）在33.9±2.7岁时被找到并参与研究。将他们的数据与未参与的13例患者比较，治疗前后的咬合检查结果无系统性差异；然而，未参与者的PAR评分在各个时期均高出3.3 - 8.2分，且未参与者年龄大2.1 - 2.5岁。14.4±2.7岁治疗前，参与者的均值如下：PAR = 15.0±7.0，Ⅱ类磨牙关系（MR） = 0.8±0.3尖牙宽度（cw），覆 覆盖 = 5.3±1.3 mm。治疗后，PAR评分为2.9±1.3，磨牙关系为超Ⅰ类（-0.1±0.1 cw），覆 覆盖正常（1.2±0.8 mm）。回访时，PAR评分增至5.9±3.6分，主要是由于覆 覆盖增至2.5±1.5 mm。平均磨牙关系仍为Ⅰ类（0.0±0.2 cw）。对于所有变量，未经治疗的对照组表现出相似的结果。
Ⅱ类2分类错 畸形患者使用Herbst-MBA治疗后的咬合疗效显示出非常好的长期稳定性。虽然治疗后出现了轻微变化，但长期结果与未经治疗的Ⅰ类错 畸形对照相似。
