Daniel Santos Fonseca Figueiredo1, Flávia Uchôa Costa Bartolomeo1, Camila Rodrigues Romualdo1, Juan Martin Palomo2, Martinho Campolina Rebello Horta3, Ildeu Andrade4, Dauro Douglas Oliveira5. 1. Private practice, Belo Horizonte, Brazil. 2. Associate professor and program director, Department of Orthodontics; and director of the Craniofacial Imaging Center, School of Dental Medicine, Case Western Reserve University, Cleveland, Ohio. 3. Associate professor and dean of graduate studies, School of Dentistry, Pontifical Catholic University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil. 4. Associate professor, Department of Orthodontics, Pontifical Catholic University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil. 5. Associate professor and program director, Department of Orthodontics, Pontifical Catholic University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil. Electronic address: dauro.bhe@gmail.com.
Abstract
INTRODUCTION: The purpose of this study was to evaluate the skeletal and dental changes in the maxillae of patients with clefts treated with 3 expanders: hyrax, fan-type, and inverted mini-hyrax supported on the first premolars. METHODS: Thirty patients with unilateral cleft lip and palate with transverse maxillary deficiency were divided into 3 groups, according to the type of expander that they used. Cone-beam computed tomography images were taken before and 3 months after expansion, and the paired t test was used to evaluate the changes in each group. RESULTS: The subjects in the inverted mini-hyrax group showed significant forward displacement of the maxilla (P <0.05). On the transversal plane, the hyrax group showed greater expansion in the posterior region than in the anterior region (P <0.05). However, the fan-type and the inverted mini-hyrax groups showed significantly greater maxillary expansion anteriorly than posteriorly (P <0.05). There was a greater tendency for buccal inclination of the supporting teeth when the fan-type was used. The cleft and the noncleft sides expanded symmetrically with all appliances, and there was no difference in dental tipping between these sides (P >0.05). CONCLUSIONS: The hyrax expander showed better results for cleft patients requiring anterior and posterior maxillary expansion. The inverted mini-hyrax most effectively restricted posterior expansion, optimizing anterior expansion without causing as much buccal tipping of the supporting teeth as did the fan-type.
INTRODUCTION: The purpose of this study was to evaluate the skeletal and dental changes in the maxillae of patients with clefts treated with 3 expanders: hyrax, fan-type, and inverted mini-hyrax supported on the first premolars. METHODS: Thirty patients with unilateral cleft lip and palate with transverse maxillary deficiency were divided into 3 groups, according to the type of expander that they used. Cone-beam computed tomography images were taken before and 3 months after expansion, and the paired t test was used to evaluate the changes in each group. RESULTS: The subjects in the inverted mini-hyrax group showed significant forward displacement of the maxilla (P <0.05). On the transversal plane, the hyrax group showed greater expansion in the posterior region than in the anterior region (P <0.05). However, the fan-type and the inverted mini-hyrax groups showed significantly greater maxillary expansion anteriorly than posteriorly (P <0.05). There was a greater tendency for buccal inclination of the supporting teeth when the fan-type was used. The cleft and the noncleft sides expanded symmetrically with all appliances, and there was no difference in dental tipping between these sides (P >0.05). CONCLUSIONS: The hyrax expander showed better results for cleftpatients requiring anterior and posterior maxillary expansion. The inverted mini-hyrax most effectively restricted posterior expansion, optimizing anterior expansion without causing as much buccal tipping of the supporting teeth as did the fan-type.
Authors: Fernando Pugliese; Juan Martin Palomo; Louise Resti Calil; Arthur de Medeiros Alves; José Roberto Pereira Lauris; Daniela Garib Journal: Angle Orthod Date: 2019-08-30 Impact factor: 2.079
Authors: Inês Francisco; Gregory S Antonarakis; Francisco Caramelo; Maria Helena Fernandes; Francisco Vale Journal: Healthcare (Basel) Date: 2022-08-17