@article{article_1584299, title={INVESTIGATION OF THE EFFECTS OF RAPID MAXILLARY EXPANSION WITH A LOCKED MODIFIED ACRYLIC BONDED APPLIANCE ON DENTOSKELETAL STRUCTURES IN MIXED DENTITION: A PROSPECTIVE CLINICAL STUDY}, journal={Sağlık Bilimleri Dergisi}, volume={34}, pages={256–266}, year={2025}, DOI={10.34108/eujhs.1584299}, author={Irgın, Celal and Sari, Zafer}, keywords={Crossbite, maxillary expansion, mixed dentition, orthodontic appliances}, abstract={The objective of this study was to examine the effects of a locked rapid maxillary expansion appliance on the dentoskeletal structures of patients who experienced transverse maxillary constriction with a true unilateral posterior crossbite. The appliance used in this study was a modification of the tooth- and tissue-supported, fully covered acrylic rapid maxillary expansion appliance. To provide asymmetric expansion of the maxillary halves, an acrylic locking unit was constructed on the occlusal surface of the noncrossbite side of the appliance, anchored by the lower posterior teeth on the same side. This study included a total of 30 patients (14 girls and 16 boys; mean age 8.74 ± 0.56 years) with mixed dentition. Lateral and frontal cephalograms and plaster model records were taken before expansion, immediately after expansion, and 3 months after retention. Repeated measures analysis of variance was used to compare the measurements at various time points. Covariance analysis was also used to evaluate the differences between the crossbite and noncrossbite sides. The level of statistical significance was set at 0.05.The results indicated that the appliance producedstatistically significant maxillary expansion on the crossbite side compared with the noncrossbite side (p<0.05). The maxilla exhibited greater skeletal movement in the transverse plane than in the sagittal and vertical planes. In the treatment of true unilateral posterior crossbites in mixed dentition, this appliance is effective and might be preferred.}, number={2}, publisher={Erciyes University}, organization={This study was supported by XXX University Scientific Research Projects Department with project number 08102026. This research did not receive support from any funding agency/industry.}