双板矫治器与固定矫治器早期治疗安氏Ⅱ类错颌的随机对照研究

Comparative Evaluation of Twin Block Appliance and Fixed Orthodontic Appliance in Early Class II Malocclusion Treatment: A Randomized Controlled Trial.

机构信息

Department of Orthodontics, Mansoura University, Mansoura, Egypt, Phone: +01094233462, e-mail:

Department of Orthodontics, Mansoura University, Mansoura, Egypt.

出版信息

J Contemp Dent Pract. 2022 Nov 1;23(11):1111-1121. doi: 10.5005/jp-journals-10024-3426.

DOI:10.5005/jp-journals-10024-3426

PMID:37073934

Abstract

AIMS

To compare skeletal, dentoalveolar, and soft tissue changes between Twin block and early fixed orthodontic appliance for class II division 1 malocclusion treatment through a randomized controlled trial.

MATERIALS AND METHODS

This study was a randomized controlled trial with a 1:1 allocation ratio in which 40 patients were divided equally into two groups: control and experimental; each group had an equal number of boys and girls. Randomization was achieved using random blocks of 20 patients with allocation concealed in sequentially numbered, opaque, and sealed envelopes. Blinding was only applicable for data analysis of radiographic measurements. Twin block appliance was used in the experimental group for 1 year. However, control group was treated with fixed appliance. Skeletal class II division 1 malocclusion with mandibular retrognathism; cephalometric angular measurements: SNA ≥ 82, SNB ≤ 78, ANB ≥ 4; overjet ≥6 mm; and patient in circumpubertal stage cervical vertebral maturation (CVM2 and CVM3). Cephalometric skeletal, dental, and soft tissue angular and linear measurements were used for evaluation.

RESULTS

SNB increased remarkably by 4° in the Twin block group, but only by 0.68 in the control group. There was a significant decrease in vertical dimensions (SN-GoGn) in the Twin block group compared to control group ( = 0.002). Significant enhancement in the facial profile of the patients was observed.

CONCLUSIONS

The Twin block appliance induced significant skeletal and dental changes. These changes were more obvious relative to the slight changes induced by natural growth.

CLINICAL SIGNIFICANCE

Early treatment of Class II due to mandibular retrusion with Twin block functional appliance is recommended due to its favourable skeletal effect. Early treatment with fixed appliance affects mainly the dentoalveolar component. Long term follow-up is needed for further insights.

摘要

目的

通过随机对照试验比较 Twin block 和早期固定矫正器治疗安氏Ⅱ类 1 分类错牙合的骨骼、牙牙槽和软组织变化。

材料与方法

这是一项随机对照试验，采用 1:1 分配比例，将 40 名患者分为两组：对照组和实验组；每组男女比例相等。采用 20 名患者的随机块进行随机分组，分配隐藏在连续编号、不透明和密封的信封中。仅对放射测量数据分析进行盲法。实验组使用 Twin block 矫治器治疗 1 年，而对照组则使用固定矫治器。下颌后缩的安氏Ⅱ类 1 分类错牙合；头影测量角测量：SNA≥82，SNB≤78，ANB≥4；覆牙合≥6mm；和青春期阶段颈椎成熟度（CVM2 和 CVM3）的患者。使用头影测量骨骼、牙齿和软组织角度和线性测量进行评估。