Abstract
PurposeThe aim of this study was to compare the dental effects, impact on quality of life, and pain perception of adolescents wearing Mini Hyrax and Hyrax expanders in rapid palatal expansion.MethodsThirty-four adolescents aged 11 to 16 years, with maxillary transverse deficiency (unilateral or bilateral posterior crossbite), were randomly allocated into two groups, Mini Hyrax group and Hyrax group (1:1 ratio). Dental effects were evaluated by digitally superimposed pretreatment and postretention three-dimensional intraoral scans on the palatal rugaes using the software 3DSlicer. Impact on quality of life was assessed with the OHIP-14 questionnaire applied in the pretreatment, posttreatment and postretention. Visual analog scale was applied 24, 48, and 72 h and 7 days after the first activation of the expander.ResultsThirty of the 34 adolescents recruited completed the study. There were no statistically significant differences in dentoalveolar effects between groups. OHIP-14 scores across time among Mini Hyrax wearers were similar to those of the Hyrax wearers. The inter-group comparisons showed no difference between groups with respect to the OHIP-14 scores in posttreatment and postretention (p > 0.05). There were no differences in pain perception between groups. Considering intra-group comparison, the reduction in pain perception among adolescents in the Mini Hyrax group was gradual. Among adolescents in the Hyrax group, a statistically significant reduction between 48 and 72 h was observed.ConclusionThere were no significant differences in dental effects, impact on quality of life and pain perception between adolescents wearing Mini Hyrax and Hyrax expanders in rapid palatal expansion.
Highlights
Maxillary constriction is the result of deficiency in the growth of the maxilla in the transverse direction
No difference between excluded individuals and individuals who participated in the trial for sex (p = 0.348), age (p = 0.06), posterior crossbite (p = 0.99), angle classification (p = 0.765), transverse linear molar measurements at T0 (p = 0.384), and the total score of OHIP-14 at T0 (p = 0.375) was observed
The treatments were performed from February 2019 to February 2020, and outcome measurements were performed from March 2019 to February 2020, when the retention period of the last participant had been finished
Summary
Maxillary constriction is the result of deficiency in the growth of the maxilla in the transverse direction. The most representative clinical finding of maxillary constriction is a unilateral or bilateral posterior crossbite [1]. Haas-type and Hyrax are the most widely used expansion devices for this purpose [4]. Both expanders produce similar dentoskeletal effects [4, 6], but therapy with Hyrax causes less irritation on the palate because it has no acrylic pad that injuries the mucosa of the palatal vault during expansion making oral hygiene easier [7]. Patients undergoing rapid palatal expansion (RPE) with these bonded expanders may experience limitations in chewing, swallowing and speech [8,9,10,11]
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