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© 2022 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.Objectives: To compare the skeletal and dental effects of different types of rapid maxillary expansion (RME) appliances using cone-beam computed tomography (CBCT). Materials/Methods: This multi-centre study was conducted with a total of 56 patients. The sample consisted of two groups including the McNamara-Type RME (MNR) group with 30 patients (16 females, 14 males, mean age: 13.38 ± 1.16 years) and Full-Coverage RME (FCR) group with 26 patients (10 females, 16 males, mean age:13.78 ± 1.06 years). Twenty-one parameters were measured on CBCT images including 4 maxillary skeletal, 12 maxillary alveolar, and 5 maxillary dental measurements, and the data were analysed using the SPSS 20.0 software. Results: The rates of increase in the palatal maxillary width (PMW) (3), PMW(4), and PMW(6) were significantly higher in the MNR group (P |
