CBCT Comparison of Dentoskeletal Effects of Haas-Type and Hyrax-Type Expanders Using Deciduous Teeth as Anchorage: A Randomized Clinical Trial

The aim of this study was to compare the three-dimensional dentoskeletal effects Haas-type and Hyrax-type expanders using primary teeth as anchorage for rapid palatal expansion (RPE). Thirty-four subjects in mixed dentition were divided according their expander’s type: Hyrax (n = 16; 6F, 10M; mean age 8 ± 3 years) or Haas 18; 14F, 4M; 2 years). Each patient underwent CBCTs before (T0) after RPE (T1). Dentoskeletal changes collected. A paired sample t-test independent used each variable within same group between groups, respectively, with a 5% significance. showed an increase all parameters; skeletal significantly increased anteriorly (1.76 mm) posteriorly (1.93 mm). greatest dental observed unit (6.47 mm), about twice much permanent molars (3.42 statistical significance measurements observed; (2.97 greater than on anchored (6.80 non-anchored (4.57 No Hass groups. CBCT analysis that, RPE, expansion. significant clinical appliances teeth.