Ugolini A, Bruni A, Abate A, Pistoni F, Donelli M, Quinzi V, Silvestrini Biavati F, Lanteri V
Department of Sciences Integrated Surgical and Diagnostic, University of Genova, 16126 Genova, Italy.
Surgical, Medical and Dental Department, University of Modena and Reggio Emilia, 41124 Modena, Italy.
Eur J Paediatr Dent. 2025 Mar 1;26(1):48-54. doi: 10.23804/ejpd.2024.2208. Epub 2024 Sep 1.
To evaluate palatal surface effects induced by LE and RPE, alongside spontaneous changes in an untreated group, and to compare differences in canine and molar inclination among the three groups.
This randomised clinical trial aimed to compare digital models pre- and post-treatment over 12 months in patients receiving tooth-borne Leaf Expander® (LE) and tooth-borne Hyrax-type maxillary expander (RPE) treatments, alongside untreated patients. Analysis included 24 LE patients (13 males, 11 females, mean age 8.5±1.5), 22 RPE patients (10 males, 12 females, mean age 7.9±1.6), and 17 untreated subjects (7 males, 10 females, mean age 8.1±1.2). Inclusion criteria comprised indications for maxillary expansion treatment, mixed dentition, CVMS ≤ 3, erupted first molars, and good oral hygiene. Digital models were obtained using an intraoral scanner pre- and post-treatment. Palatal surface, segmented into anterior, median, and posterior zones, and canine/molar inclination were measured at T0-T1 using VAM software as the primary and secondary endpoint. Statistical analyses involved paired-sample T-tests for intra-group comparisons and ANOVA tests with Bonferroni correction for inter-group comparisons.
No significant difference in palatal surface increment was found between the two experimental groups (LE and RPE); both demonstrated a significant increase in palatal surface. The greatest increment occurred in the median palate zone for both experimental groups. The increment in the untreated control group was not significant. Furthermore, the RPE group showed a greater inclination of permanent molars compared to those treated with LE, indicating that expansion with lighter and continuous forces may lead to fewer dental side effects.
评估扩弓器（LE）和快速扩弓器（RPE）对上腭表面的影响，以及未治疗组的自然变化，并比较三组之间犬齿和磨牙倾斜度的差异。
这项随机临床试验旨在比较接受牙支持式扩弓器（Leaf Expander®，LE）和牙支持式Hyrax型上颌扩弓器（RPE）治疗的患者以及未治疗患者在12个月治疗前后的数字化模型。分析纳入了24例接受LE治疗的患者（13例男性，11例女性，平均年龄8.5±1.5岁）、22例接受RPE治疗的患者（10例男性，12例女性，平均年龄7.9±1.6岁）和17例未治疗的受试者（7例男性，10例女性，平均年龄8.1±1.2岁）。纳入标准包括上颌扩弓治疗指征、混合牙列、CVMS≤3、第一恒磨牙萌出且口腔卫生良好。在治疗前后使用口腔内扫描仪获取数字化模型。使用VAM软件将上腭表面分为前、中、后区域，并在T0 - T1测量犬齿/磨牙倾斜度，作为主要和次要终点。统计分析包括组内比较的配对样本T检验和组间比较的ANOVA检验及Bonferroni校正。
两个试验组（LE和RPE）在上腭表面增量方面未发现显著差异；两者均显示上腭表面有显著增加。两个试验组中最大的增量发生在腭中区域。未治疗对照组的增量不显著。此外，与接受LE治疗的患者相比，RPE组的恒牙磨牙倾斜度更大，表明使用较轻且持续的力进行扩弓可能导致较少的牙齿副作用。
