Effects of rapid maxillary expansion in cleft patients resulting from the use of two different expanders.
The aim of this study was to evaluate the skeletal and dental effects of rapid maxillary expansion (RME) in cleft patients using two types of expanders.
Twenty unilateral cleft lip and palate patients were randomly divided into two groups, according to the type of expander used: (I) modified Hyrax and (II) inverted Mini-Hyrax. A pretreatment cone-beam computed tomographic image (T0) was taken as part of the initial orthodontic records and three months after RME, for bone graft planning (T1).
In general, there was no significant difference among groups (p > 0.05). Both showed a significant transverse maxillary expansion (p < 0.05) and no significant forward and/or downward movement of the maxilla (p > 0.05). There was greater dental crown than apical expansion. Maxillary posterior expansion tended to be larger than anterior opening (p < 0.05). Cleft and non-cleft sides were symmetrically expanded and there was no difference in dental tipping between both sides (p > 0.05).
The appliances tested are effective in the transverse expansion of the maxilla. However, these appliances should be better indicated to cleft cases also presenting posterior transverse discrepancy, since there was greater expansion in the posterior maxillary region than in the anterior one.
Former Orthodontic residents, Pontifícia Universidade Católica de Minas Gerais (PUC-MG), Belo Horizonte, Brazil.
Daniel Santos Fonseca
DS
Figueiredo
Former Orthodontic residents, Pontifícia Universidade Católica de Minas Gerais (PUC-MG), Belo Horizonte, Brazil.
Lucas
L
Cardinal
Former Orthodontic residents, Pontifícia Universidade Católica de Minas Gerais (PUC-MG), Belo Horizonte, Brazil.
Flávia Uchôa Costa
FU
Bartolomeo
Associate Professor and Program Director, Case Western Reserve University, Department of Orthodontics, and Director of the Craniofacial Imaging Center, School of Dental Medicine, Cleveland, Ohio, USA.
Juan Martin
JM
Palomo
Associate Professor and Dean of Graduate Studies, Pontifícia Universidade Católica de Minas Gerais (PUC-MG), Belo Horizonte, Brazil.
Martinho Campolina Rebello
MC
Horta
Associate Professor of Orthodontics, Pontifícia Universidade Católica de Minas Gerais (PUC-MG), Belo Horizonte, Brazil.
Ildeu
I
Andrade
Associate Professor and Program Director of Orthodontics, Pontifícia Universidade Católica de Minas Gerais (PUC-MG), Belo Horizonte, Brazil.
Dauro Douglas
DD
Oliveira
D002648:Child; D002972:Cleft Palate / Q000000981:diagnostic imaging / Q000628:therapy*; D054893:Cone-Beam Computed Tomography; D005260:Female; D006801:Humans; D008297:Male; D009967:Orthodontic Appliances; D010155:Palatal Expansion Technique / Q000295:instrumentation*; D010159:Palate / Q000000981:diagnostic imaging
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