von Bremen Julia, Pancherz Hans, Ruf Sabine
Department of Orthodontics, University of Giessen, Germany.
Eur J Orthod. 2007 Dec;29(6):609-13. doi: 10.1093/ejo/cjm053. Epub 2007 Sep 14.
The aim of this study was to analyse anchorage loss with reduced, in comparison with total mandibular cast splints during Herbst treatment. Lateral head films of 32 Class II division 1 patients (15 females, 17 males) aged 13.0 years with reduced mandibular cast splints (RMS: second premolar to second premolar) and of 34 Class II division 1 patients (19 females, 15 males) aged 13.9 years with total mandibular cast splints (TMS: molar to molar) were analysed before (T1) and directly after (T2) Herbst treatment. Anchorage loss was assessed considering mandibular incisor proclination, changes of lower incisor edge position, and changes of occlusal plane inclination. To assess possible group differences, Student's t-tests were applied. The lower incisors proclined more in the RMS (11.8 degrees) than in the TMS (9.3 degrees) group. However, the amount of incisal edge advancement was less in the RMS (2.9 mm) than in the TMS (3.7 mm) group. The occlusal plane tilted insignificantly less in the RMS (5.7 degrees) than in the TMS (6.3 degrees) group. Reduced and total mandibular casted splint anchorage seemed to be similarly effective. Anchorage loss, measured by mandibular incisor proclination, was greater in the reduced anchorage group, whereas measured by lower incisor edge advancement, it was larger in the total anchorage group. Therefore, RMS can be recommended for Herbst treatment since they are less expensive than total splints.
本研究的目的是分析在Herbst治疗期间，与全下颌铸造夹板相比，简化下颌铸造夹板的支抗丧失情况。对32例13.0岁的安氏II类1分类患者（15名女性，17名男性）使用简化下颌铸造夹板（RMS：第二前磨牙至第二前磨牙）以及34例13.9岁的安氏II类1分类患者（19名女性，15名男性）使用全下颌铸造夹板（TMS：磨牙至磨牙），在Herbst治疗前（T1）和治疗刚结束后（T2）拍摄头颅侧位片进行分析。通过考虑下颌切牙前倾、下切牙边缘位置的变化以及平面倾斜度的变化来评估支抗丧失情况。为评估可能存在的组间差异，采用了学生t检验。简化下颌铸造夹板组（RMS）的下切牙前倾程度（11.8度）大于全下颌铸造夹板组（TMS，9.3度）。然而，简化下颌铸造夹板组（RMS，2.9 mm）的切缘前移量小于全下颌铸造夹板组（TMS，3.7 mm）。简化下颌铸造夹板组（RMS，5.7度）的平面倾斜度比全下颌铸造夹板组（TMS，6.3度）略小，但差异不显著。简化和全下颌铸造夹板支抗似乎同样有效。通过下颌切牙前倾测量的支抗丧失在简化支抗组中更大，而通过下切牙边缘前移测量时，在全支抗组中更大。因此，简化下颌铸造夹板可推荐用于Herbst治疗，因为它们比全夹板便宜。
