A cone-beam computed tomography evaluation of maxillary protraction with repetitive rapid palatal expansions and constrictions
10.3760/cma.j.issn.1002-0098.2015.02.004
- VernacularTitle:上颌反复快速扩缩前方牵引效果的锥形束CT观察
- Author:
Weitao LIU
1
;
Yang SONG
;
Xuedong WANG
;
Danqing HE
;
Yanheng ZHOU
Author Information
1. 100081,北京大学口腔医学院·口腔医院正畸科
- Keywords:
Palatal expansion technique;
Extraoral traction appliances;
Cone-beam computed tomography
- From:
Chinese Journal of Stomatology
2015;50(2):78-83
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the effects of maxillary protraction combined with repetitive rapid palatal expansions and constrictions(RPE/C) vs.rapid palatal expansion(RPE) alone using cone-beam computed tomography(CBCT).Methods Twenty four subjects with maxillary retrusion were recruited and block randomized into either the control group(n=12) or the RPE/C(n=12) group.Control group:facemask protraction after RPE.RPE/C group:facemask protraction after RPE/C.3D reconstruction,landmarks identifying,superimposition and cephalometric analysis were performed to compare the pre-treatment and post-treatment CBCT images.Results One subject in the RPE/C group was lost to follow up during the treatment.Maxilla moved forward[(2.5 ± 1.0) mm] after maxillary protraction with RPE/C,which was significantly greater than that in the control group[(1.6±0.8) mm](P＜0.05).The distance of basion to subspinale (Ba-A) increased[(3.1 ± 1.0) mm] in the RPE/C group,which was significantly greater than that in the control group[(2.2 ± 0.9) mm] (P＜0.05).The amount of forward movement of upper first molars was significantly greater in the RPE/C group(P＜0.05).Conclusions Maxillary protraction with RPE/C might positively affect the forward movement of maxilla compared with the RPE alone protocol with the early treatment of maxillary retrusion patients.
