The aim of this clinical trial was to determine the efficacy of a locked modified bonded acrylic rapid maxillary expansion appliance, also known as an asymmetric rapid maxillary expansion appliance (ARME), in patients with a true unilateral posterior crossbite resulting from transversal maxillary deficiency in the mixed dentition.
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Widths of skeletal structures
Timeframe: Before expansion (T1),through expansion completion,an average 1 month (T2),and through retention completion, an average 3 months (T3)
Skeletal maxillomandibular width ratios
Timeframe: Before expansion(T1),through expansion completion an average 1 month(T2),and through retention completion an average 3 months(T3)
Inclinations of upper and lower first molars
Timeframe: Before expansion(T1),through expansion completion an average 1 month(T2),and through retention completion an average 3 months(T3)
Amount of movement of deciduous canines and first molars in the transversal plane on the crossbite and non-crossbite sides.
Timeframe: Before expansion(T1),through expansion completion an average 1 month(T2),and through retention completion an average 3 months(T3)
Intercanine and intermolar distance on dental cast
Timeframe: Before expansion(T1),through expansion completion an average 1 month(T2),and through retention completion an average 3 months(T3)