Angle Orthod. 2021 Jan 1;91(1):9-21. doi: 10.2319/040320-250.1.
To evaluate the use of the Forsus Fatigue Resistant Device (FFRD), supported with bimaxillary splints, in treatment of skeletal Class II malocclusion.
Data from 46 skeletal Class II females who received either conventional Forsus alone (FFRD group) (15 patients, 12.54 ± 0.90 years), FFRD and bimaxillary splints (splint-FFRD group) (15 patients, 12.29 ± 0.82 years), or were untreated controls (16 subjects, 12.1 ± 0.9 years) were retrieved from previous clinical trials. FFRD was inserted onto the mandibular archwire in the FFRD group after leveling and alignment with multibracket appliances. In the splint-FFRD group, Forsus was inserted between fixed maxillary and mandibular splints. Treatment continued until reaching an edge-to-edge incisor relationship.
Both treatment groups failed to induce significant mandibular skeletal effects compared to the normal growth exhibited by untreated controls. The splint-FFRD group showed significant reduction of SNA (-0.88° ± 0.51°) and ANB (-1.36° ± 0.87°). The mandibular incisors showed significant proclination in the FFRD (9.17° ± 2.42°) and splint-FFRD groups (7.06° ± 3.34°).
The newly proposed splint-supported FFRD was equally effective as the conventional FFRD in treatment of Class II malocclusion with dento-alveolar changes and additional maxillary restricting effect. It has an additional advantage of immediate initiation of the Class II correction.
评估 Forsus 疲劳阻力装置（FFRD）与双颌夹板联合使用治疗骨性 II 类错[牙合]畸形的效果。
从之前的临床试验中检索了 46 名接受传统 Forsus 单独治疗（FFRD 组）（15 例，12.54 ± 0.90 岁）、FFRD 和双颌夹板（夹板-FFRD 组）（15 例，12.29 ± 0.82 岁）或未接受治疗的对照组（16 例，12.1 ± 0.9 岁）的女性骨骼 II 类患者的数据。FFRD 组在使用多托槽矫治器排齐整平下颌弓丝后插入下颌弓丝。在夹板-FFRD 组中，Forsus 被插入固定的上颌和下颌夹板之间。治疗持续到达到尖牙对刃关系。
与未经治疗的对照组所表现出的正常生长相比，两组治疗均未能引起明显的下颌骨骼效应。夹板-FFRD 组的 SNA（-0.88° ± 0.51°）和 ANB（-1.36° ± 0.87°）显著减小。下颌切牙在 FFRD（9.17° ± 2.42°）和夹板-FFRD 组（7.06° ± 3.34°）中表现出明显的前倾。
新提出的夹板支持 FFRD 在治疗 II 类错[牙合]畸形伴牙牙槽变化和额外的上颌限制作用方面与传统 FFRD 同样有效。它还有一个额外的优势，即可以立即开始进行 II 类矫正。
