背景:InvisalignFirst系统(First)是一种新型的正畸矫治器,用于混合牙列儿童的上颌弓扩张。到现在为止,很少有研究评估First与其他电器的扩张效应。更重要的是,大多数关于足弓扩张的研究不包括自然组以排除生长效应。这项前瞻性队列研究旨在评估青少年使用First或丙烯酸夹板快速上颌扩张器(RME)排除生长因子的牙齿和牙槽效应。
方法:经过严格的纳入标准和倾向评分匹配(PSM)筛选后,51例患者包括:第一组(n=17),RME组(n=17),自然生长(NG)组(n=17)。包括牙弓宽度在内的九项指标,牙槽弓宽度,在基线(T0)和6个月随访(T1)时,在数字牙模上测量磨牙的倾斜度。组内结果采用配对t检验,组间比较采用双样本独立t检验。
结果:NG组六个月内所有指标均无明显升高(p>0.05)。在第一组和RME组中,治疗后所有宽度指标均显著增加(p<0.05)。RME组在犬间宽度上比第一组表现出更大的扩张,第一内切磨牙宽度,第二落叶间磨牙宽度,第一磨牙间宽度,拱形周长,犬齿间牙槽宽度,磨牙间牙槽宽度,和磨牙的倾斜度(p<0.05)。然而,两个治疗组之间的足弓深度没有显着差异。
结论:First和RME均可扩大混合牙列的上颌弓。在轻度至中度上颌横向缺陷(MTD)的情况下,InvisalignFirst系统可能是一个合理的选择。RME显示出比First更好的牙弓扩张效率,推荐用于重度MTD患者。
背景:这项前瞻性研究已在ClinicalTrials.gov上注册(2022年01月02日,注册号:ChiCTR2200056220)。本试验经湖南省湘雅口腔医院中南大学伦理委员会批准(20,200,088),并获得所有受试者及其法定监护人的知情同意书.
Invisalign First System (First) is a new type of orthodontic appliance for maxillary arch expansion in mixed dentition children. Till now, few studies have evaluated the expansion effects of First versus other appliances. What\'s more, most studies of arch expansion did not include a natural group to rule out growth effects. This prospective cohort
study aimed to evaluate the dental and dentoalveolar effects using First or acrylic splint rapid maxillary expander (RME) in adolescents excluding growth factors.
After screening by strict inclusion criteria and propensity score matching (PSM), fifty-one patients were included: First group (n = 17), RME group (n = 17), and natural growth (NG) group (n = 17). Nine indicators including dental arch width, dentoalveolar arch width, and inclination of the molars were measured on digital dental casts at baseline (T0) and six-month follow-up (T1). Paired t-tests were used for intra-group results, and two-sample independent t-tests were used for inter-group comparisons.
There was no significant increase in all indicators within six months in the NG group (p > 0.05). In the First group and RME group, all width indicators were significantly increased after treatment (p < 0.05). The RME group exhibited greater expansion than the First group in intercanine width, first interpremolar width, second interdeciduous molar width, first intermolar width, arch perimeter, intercanine dentoalveolar width, intermolar dentoalveolar width, and inclination of the molars (p < 0.05). Whereas, there was no significant difference in arch depth between the two treated groups.
Both First and RME can expand the maxillary arch in mixed dentition. In case of mild to moderate maxillary transverse deficiency (MTD), Invisalign First System could be a reasonable option. RME shows significant better efficiency of dental arch expansion than First, recommended for patients with severe MTD.
This prospective
study was registered on ClinicalTrials.gov (01/02/2022, registration number: ChiCTR2200056220). The
trial was approved by the Ethical Committee of the Hunan Xiangya Stomatological Hospital Central South University (20,200,088), and informed consent was obtained from all subjects and their legal guardian(s).