Lateral Cephalometric Analysis of Maxillary Positional Changes Treated by Mini-implant Assisted Rapid Palatal Expansion vs. Hyrax Expansion: Comparative Prospective Study

Volume 11 , Issue 2 , August 2024 , Pages 1-9

Authors

Noorsan N. Abbas 1 ; Trefa M. Mahmood 1

1 University of Sulaimani

DOI logo 10.17656/sdj.10187

Keywords

Abstract

Objective: The aim of this study was to compare the skeletal, dental, and soft tissue evaluation of mini-implant-assisted rapid palatal expansion and hyrax expansion, most commonly used to treat maxillary transverse deficiency, on lateral cephalogram at two-time intervals.
Methods: The research employed lateral cephalograms at two-time intervals in thirty-six patients treated with rapid maxillary expansion (RME). Depending on the type of expansion, patients were divided into two groups. The hyrax group (n = 18; ages = 16.33 ±2.3 years) had RME with tooth-borne appliance; the mini-implant-assisted rapid palatal expansion group (n = 18; ages = 18.3 ± 2.5 years) had RME with a tooth-bone-borne appliance. Pretreatment and posttreatment digital lateral cephalogram samples were analyzed with WebCeph. The two groups were compared for cephalometric differences using the Mann-Whitney test. Intragroup differences were assessed with the Wilcoxon Signed Ranks Test.
Results: When inter-group differences were assessed, statistically significant differences in the mean changes were observed. The sella- nasion-point A angle increased more in the mini-implant-assisted rapid palatal expansion group, and the upper lip to E-line decreased more in the hyrax group. Intragroup differences, assessed by the Wilcoxon Signed Ranks Test, were found to be statistically significant for the upper lip to E-line and nasolabial angle decrease for hyrax group, while in the mini-implant-assisted rapid palatal expansion group, the sella- nasion-point A angle increased.
Conclusions: MARPE expanders lead to more skeletal changes. An increase in the SNA angle caused the maxilla to move forward. However, in the Hyrax group, statistically significant differences were seen in soft tissue analysis.

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