Original Article
Effects of modified FR III appliance on children with class III malocclusion
Wu Yan, Huang Wenbo, Zeng Qing
Published 2020-07-25
Cite as Chin J Pract Med, 2020, 47(14): 37-40. DOI: 10.3760/cma.j.cn115689-20200403-01508
Abstract
ObjectiveTo explore the effects of modified FR III appliance on children with class III malocclusion.
MethodsA retrospective analysis was performed on the clinical data of children with class III malocclusion who underwent traditional FR III appliance (control group, n=59) and modified FR III appliance (study group, n=59) in Nanyang Central Hospital from January 2017 to January 2019. The clinical efficacy after 12 months of treatment, hard tissue indexes [ANB angle, SNA angle, SNB angle, mandibular plane angle (MP-FH), maxillary position, maxillary length, mandible length, lower face height, upper and middle incisor angle (U1-NA angle), inferior and middle incisor angle (L1-NB angle)] and chewing efficiency (OD value) before treatment and after 12 months of treatment were compared between the two groups.
ResultsAfter 12 months of treatment, the total effective rate of the study group was 91.53%, which was significantly higher than that of the control group (77.97%, P<0.05). After 12 months of treatment, the ANB angle, SNA angle, SNB angle, mandibular plane angle (MP-FH) and U1-NA angle in the two groups increased compared with those before treatment (P<0.05), and the difference between the two groups was significantly (P<0.05). There were no significant difference in the maxillary position and lower face height in the two groups (P>0.05). The maxillary length in study group was increased compared with that before treatment (P<0.05) , and the L1-NB angle had no significant change (P>0.05), and the maxillary length in control group had no significantl changes compared with that before treatment (P>0.05), and the L1-NB angle was reduced (P<0.05), and there were significant differences in the maxillary length and L1-NB angle between the two groups (P<0.05). After 12 months of treatment, the OD value in the two groups was increased significantly (P<0.05), and the OD value in study group was higher than that in control group (P<0.05).
ConclusionsCompared with traditional FR III appliance, modified appliance is more suitable for treating children patients with class III malocclusion. It can not only improve the treatment effects, effectively improve the facial shape, but also improve the chewingefficiency. And it has good application value.
Key words:
Class III malocclusion; FR III appliance, modified type
Contributor Information
Wu Yan
Department of Dental, Nanyang Central Hospital, Nanyang 473000, China
Huang Wenbo
Department of Dental, Nanyang Central Hospital, Nanyang 473000, China
Zeng Qing
Department of Dental, Nanyang Central Hospital, Nanyang 473000, China
畸形的效果观察
畸形的效果。
患儿的临床资料。对比两组患儿治疗12个月后的临床疗效，治疗前、治疗12个月后硬组织指标[ANB角、SNA角、SNB角、下颌平面角(MP-FH)、上颌位置、上颌长、下颌长、面下部高、上中切牙角(U1-NA角)、下中切牙角(L1-NB角)] 、咀嚼功能(OD值)。
患儿，不仅能提升治疗效果、有效改善患儿面型，还能提升患儿咀嚼效能。
是一种在儿童中发病率较高的发育性疾病，其会随着患儿的生长而加重，不仅影响患儿的颌骨发育、口腔功能，也会严重影响患儿面貌美观及引起心理问题[1]。故应尽早治疗此病患儿，以促使患儿上颌骨向前生长发育，改变下颌骨的生长方向，进而促进患儿颌骨的生长发育更加协调，最大程度降低患儿面部畸形程度[2]。临床上矫正此病的方法各种各样，根据牙齿的生长阶段分为乳牙期矫正(如咬翘法、调磨乳尖牙等)、替牙期矫正(如阻断性矫治、生长引导矫治、活动矫治器等)、恒牙期矫正(如拔牙或非拔牙矫正、种植支抗等)，故而应根据患儿牙齿的生长阶段选择相应的方法进行治疗[3,4]。阻断性矫治方法中包括FRⅢ型矫治器、Ⅲ型肌激动器。改良型FRⅢ型矫治器通过改进传统型所得，此矫治器大部分结构位于口腔前庭，以阻挡唇颊肌的压力，进而促进上颌骨及抑制下颌骨的生长[5]。本研究探讨改良型FRⅢ型矫治器治疗安氏Ⅲ类错
患儿的效果。
