DDS, MS, Post-doc researcher, Department of Biomedical, Surgical and Dental Sciences, University of Milan, Fondazione IRCCS Ca´ Granda, Ospedale Maggiore Policlinico, Milan, Italy.
DDS, MS Private Practice, Bra (CN), Italy.
Eur J Paediatr Dent. 2018 Sep;19(3):199-204. doi: 10.23804/ejpd.2018.19.03.6.
The aim of this study is to compare the dental and orthopaedic effects of the Leaf Expander with rapid and slow maxillary expanders.
The sample comprised 30 patients with a posterior crossbite divided into three groups: the rapid maxillary expander (RME) group (3 m, 7 f), average age 8.9 years; the slow maxillary expander (SME) group (7 m, 3 f) average age 12.2 years; the Leaf Expander (LE) group (7 m, 3 f), average age 7.9 years. Postero-anterior cephalometric studies have been obtained at the beginning of the therapy (T1) and after 9 months (T2). Nasal width, maxillary width, mandibular width, upper permanent molars width have been measured by a calibrated examiner.
All the measurements increased significantly after the treatment (paired t-test P=0.05). Maxillary average width increased of 4.2 mm (SD 3.6 mm) in RME; + 2.8 mm (SD 2.8 mm) in RSE and +3.6 mm (SD 2.2 mm) in LE group. Upper permanent molars width increased: + 5.4 mm (SD 3.31 mm) in RME; + 5.4 mm (SD 3.3 mm) in SME and + 3.8 mm (SD 2.1 mm) in LE group. No statistical differencesbetween the groups have been found (t-student test P=.05).
The effectiveness of the LE in transversal deficiency correction has been confirmed.
本研究旨在比较 Leaf Expander 与快速和慢速上颌扩张器的牙科和正畸效果。
样本包括 30 名后牙反颌患者，分为三组：快速上颌扩张器（RME）组（3m，7f），平均年龄 8.9 岁；慢速上颌扩张器（SME）组（7m，3f），平均年龄 12.2 岁；Leaf Expander（LE）组（7m，3f），平均年龄 7.9 岁。在治疗开始时（T1）和 9 个月后（T2）获得后前头颅侧位片。由经过校准的检查者测量鼻宽、上颌宽、下颌宽、上颌恒磨牙宽。
治疗后所有测量值均显著增加（配对 t 检验 P=0.05）。RME 组上颌平均宽度增加 4.2mm（SD 3.6mm）；RSE 组增加 2.8mm（SD 2.8mm）；LE 组增加 3.6mm（SD 2.2mm）。上颌恒磨牙宽度增加：RME 组增加 5.4mm（SD 3.31mm）；SME 组增加 5.4mm（SD 3.3mm）；LE 组增加 3.8mm（SD 2.1mm）。组间无统计学差异（t 检验 P=.05）。
LE 在横向发育不足矫正中的有效性得到了证实。
