Hanoun Abdulfatah, Al-Jewair Thikriat S, Tabbaa Sawsan, Allaymouni Mhd Amer, Preston Charles B
Department of Orthodontics, School of Dental Medicine, State University of New York at Buffalo, NY, USA.
Department of Orthodontics, School of Dental Medicine, State University of New York at Buffalo, NY, USA ; College of Dentistry, University of Dammam, Saudi Arabia.
Clin Cosmet Investig Dent. 2014 Aug 2;6:57-63. doi: 10.2147/CCIDE.S64119. eCollection 2014.
We evaluated the skeletal and dentoalveolar effects of the Forsus Fatigue Resistance Device (FRD) and the Twin Block appliance (TB) in comparison with nontreated controls in the treatment of patients with class II division 1 malocclusion.
THIS RETROSPECTIVE STUDY INCLUDED THREE GROUPS: TB (n=37; mean age, 11.2 years), FRD (n=30; mean age, 12.9 years), and controls (n=25; mean age, 12.6 years). Lateral cephalograms were evaluated at T1 (pretreatment) and at T2 (postappliance removal/equivalent time frame in controls). Cephalometric changes were evaluated using the Clark analysis, including 27 measurements.
Sagittal correction of class II malocclusion appeared to be mainly achieved by dentoalveolar changes in the FRD group. The TB was able to induce both skeletal and dentoalveolar changes. A favorable influence on facial convexity was achieved by both groups. Significant upper incisor retroclination occurred with the TB (-12.42°), whereas only -4° was observed in the FRD group. The lower incisors proclined more in the FRD group than the TB group. Incisor overjet reduction was 62% in the TB group versus 56% in the FRD group. Molar relation was corrected in both functional groups, resulting in a class I relation, although no change appeared in the control sample.
Both appliances were effective in correcting the class II malocclusion. Both the FRD and the TB induced significant maxillary and mandibular dentoalveolar changes; skeletal changes were induced by TB but not FRD therapy.
我们评估了Forsus抗疲劳矫治器（FRD）和双阻板矫治器（TB）与未经治疗的对照组相比，在治疗安氏II类1分类错牙合患者时对骨骼和牙-牙槽的影响。
这项回顾性研究包括三组：TB组（n = 37；平均年龄11.2岁）、FRD组（n = 30；平均年龄12.9岁）和对照组（n = 25；平均年龄12.6岁）。在T1（治疗前）和T2（拆除矫治器后/对照组的等效时间框架）时评估头颅侧位片。使用克拉克分析法评估头影测量变化，包括27项测量指标。
FRD组II类错牙合的矢状向矫正似乎主要通过牙-牙槽变化实现。TB能够引起骨骼和牙-牙槽变化。两组均对面部凸度产生了有利影响。使用TB时出现了明显的上切牙舌倾（-12.42°），而FRD组仅观察到-4°。FRD组下切牙唇倾比TB组更多。TB组切牙覆盖减小62%，而FRD组为56%。两个功能组的磨牙关系均得到矫正，达到I类关系，尽管对照组样本未出现变化。
两种矫治器在矫正II类错牙合上均有效。FRD和TB均引起了上颌和下颌明显的牙-牙槽变化；TB治疗引起了骨骼变化，而FRD治疗未引起骨骼变化。
