Abstract
ABSTRACTOBJECTIVE: The aim of this randomized clinical trial was to evaluate the dental, dentoalveolar, and skeletal changes occurring right after the rapid maxillary expansion (RME) and slow maxillary expansion (SME) treatment using Haas-type expander. METHODS: All subjects performed cone-beam computed tomography (CBCT) before installation of expanders (T1) and right after screw stabilization (T2). Patients who did not follow the research parameters were excluded. The final sample resulted in 21 patients in RME group (mean age of 8.43 years) and 16 patients in SME group (mean age of 8.70 years). Based on the skewness and kurtosis statistics, the variables were judged to be normally distributed and paired t-test and student t-test were performed at significance level of 5%.RESULTS: Intermolar angle changed significantly due to treatment and RME showed greater buccal tipping than SME. RME showed significant changes in other four measurements due to treatment: maxilla moved forward and mandible showed backward rotation and, at transversal level both skeletal and dentoalveolar showed significant changes due to maxillary expansion. SME showed significant dentoalveolar changes due to maxillary expansion.CONCLUSIONS: Only intermolar angle showed significant difference between the two modalities of maxillary expansion with greater buccal tipping for RME. Also, RME produced skeletal maxillary expansion and SME did not. Both maxillary expansion modalities were efficient to promote transversal gain at dentoalveolar level. Sagittal and vertical measurements did not show differences between groups, but RME promoted a forward movement of the maxilla and backward rotation of the mandible.
Highlights
Crossbite has been related to 7% of the American population in children and it does not self-correct over time, increasing to 9.5% of the adult population.[1]
There are many kinds of maxillary expansion appliances and various recommended expansion rates, which can result in rapid maxillary expansion (RME) or slow maxillary expansion (SME).[3,4]
For the first time, comparisons between RME and SME using Haas-type expander analyzed by cone-beam computed tomography (CBCT), this randomized clinical trial was designed to evaluate changes that occur right after the active treatment
Summary
Crossbite has been related to 7% of the American population in children and it does not self-correct over time, increasing to 9.5% of the adult population.[1]. There are many kinds of maxillary expansion appliances and various recommended expansion rates, which can result in rapid maxillary expansion (RME) or slow maxillary expansion (SME).[3,4] Using jackscrew expanders, RME can be usually defined as two turns per day while SME uses one turn after every second day or greater interval.[5] Each treatment modality (RME or SME) has advantages and disadvantages. Due to the diversity of methodologies, such as appliance design and activation, there is no consensus in the literature regarding the dental and skeletal effects immediately after RME and SME.[3,4] To provide, for the first time, comparisons between RME and SME using Haas-type expander analyzed by CBCT, this randomized clinical trial was designed to evaluate changes that occur right after the active treatment. The specific aims were to evaluate the dentoalveolar buccal tipping and skeletal changes in sagittal, vertical and transverse dimensions immediately after RME and SME in patients with mixed dentition, through CBCT
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