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

Authors : Celal Irgın, Zafer Sari

Pages : 256-266

Doi:10.34108/eujhs.1584299

View : 84 | Download : 67

Publication Date : 2025-08-15

Article Type : Research Paper

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.
Keywords : Çapraz kapanış, üst çene genişletmesi, karışık dişlenme, ortodontik apareyler.

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